-
EPRI/NRC RES FIRE PRAEPRI/NRC-RES FIRE PRA METHODOLOGYModule
I-1: Fire Risk Requantification P j tProject
J.S. Hyslop – NRC/RESR.P. Kassawara – EPRI
Fire PRA Workshop 2011Fire PRA Workshop 2011San Diego CA and
Jacksonville FLSan Diego CA and Jacksonville FL
A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute (EPRI)
gg
-
General
• Based on MOU between NRC-RES and EPRI on fire risk
• Needed to provide more realistic methods for risk-informed,
performance-based fire protection activities
• Scope is full power, CDF and LERF
• Course does not provide official NRC positions, but does
represent the expertise of authors of NUREG/CR-6850 p p(EPRI
1011989)
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Module Module II--1:
Fire Risk 1: Fire Risk RequantificationRequantification
ProjectProject
Slide Slide 22 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Quality Product
• Participation by industry and the public
• Formal process to resolve technical disputes within
NUREG/CR-6850 (EPRI 1011989) team
• Improvements made in areas important to fire risk
• Fire PRA methodology still evolving
Solutions provided to fifteen fire PRA questions in NFPA 805–
Solutions provided to fifteen fire PRA questions in NFPA 805
frequently asked questions (FAQ) process in NUREG/CR-6850
Supplement 1, EPRI 1019259
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Module Module II--1:
Fire Risk 1: Fire Risk RequantificationRequantification
ProjectProject
Slide Slide 33 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
– “Unreviewed Analysis Methods” in process
-
Uses Of Methodology
• Support for 10CFR50.48(c) implementation– Plants using
technology for fire PRA development/upgradePlants using technology
for fire PRA development/upgrade
• ANS fire risk standard development– Typically defines
state-of-art, although supports lesser capability
categories as wellcategories as well• Reactor Oversight Process
analyses
– Refined phase 3 analyses– Development of phase 2 Fire
Protection SDP (IMC 0609 Appendix F)Development of phase 2 Fire
Protection SDP (IMC 0609, Appendix F)
• Other expected uses– Analyses under the current fire
protection regulations (i.e.
exemptions/deviations or plant changes due to risk-informed
technicalexemptions/deviations or plant changes due to risk
informed technical specifications)
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Module Module II--1:
Fire Risk 1: Fire Risk RequantificationRequantification
ProjectProject
Slide Slide 44 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Fire Model Validation and Verification (V&V)
• Fire modeling is an integral part of fire PRA
• Fire model verification and validation (V&V) is required
for NFPA 805 applications
• Most fire models are computational
• Some are based only on empirical correlationsSome are based
only on empirical correlations – Address cases where computational
fire models inadequate– Fill important gaps in fire PRA
• PRA Methodology document not a reference for fire models
• EPRI/RES V&V of fire models EPRI 1011999/NUREG 1824
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Module Module II--1:
Fire Risk 1: Fire Risk RequantificationRequantification
ProjectProject
Slide Slide 55 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• EPRI/RES V&V of fire models EPRI 1011999/NUREG-1824
-
Related Activities
• EPRI 1011989/NUREG/CR-6850 Publication 2005– Publication
2005
– General workshops 2005, 2006– Detailed training 2007-2010
• EPRI 1011999/NUREG-1824 2007• Fire PRA NFPA 805 FAQ Support
2010• Fire HRA Methodology Development Late 2011• Fire Modeling
Application Guide Early 2012
Fi E t D t b 2012• Fire Events Database 2012• Fire Modeling
Training Integrated
Low Power/Shutdown Fire PRA Methods NRCFire PRA Workshop 2011,
San Diego & Jacksonville Fire PRA Workshop 2011, San Diego
& Jacksonville Module Module II--1: Fire Risk 1: Fire Risk
RequantificationRequantification ProjectProject
Slide Slide 66 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• Low Power/Shutdown Fire PRA Methods NRC
-
EPRI/NRC RES FIRE PRAEPRI/NRC-RES FIRE PRAMETHODOLOGY
dc Circuits Project and Related Activities
Gabriel Taylor – U.S. NRC U. S. NRC Office of Nuclear Regulatory
Research
J i t RES/EPRI Fi PRA T i i W k hJoint RES/EPRI Fire PRA
Training WorkshopSan Diego, CA, August 2011 andJacksonville, FL,
November 2011
A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute (EPRI)
-
History of Fire & Circuit ProblemsFailure, Protection,
Testing
• RG 1.75, “Physical Independence of Electrical Systems”B F Fi
1975• Browns Ferry Fire 1975
• IEEE 383, “Qualifying Class 1E Electrical Cables”• IN 99 17
“Post Fire Safe Shutdown Circuit Analysis Problems”• IN 99-17,
Post-Fire Safe-Shutdown Circuit Analysis Problems• NEI Cable
Testing 2001 & Expert Elicitation 2002• RIS 2004-03
“Risk-Informed Approach for Post-Fire Safe-RIS 2004 03, Risk
Informed Approach for Post Fire Safe
Shutdown Circuit Inspections”• NRC CAROLFIRE – RIS 2004-03 Bin 2
& Fire Modeling• DUKE Armored Cable Testing• NRC DESIREE-FIRE –
direct current circuits
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 22 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• KATE-FIRE – Kerite Thermal Fragility Evaluation
-
NEI / EPRI Testing 2001
• Square Steel Room• Diffusion Burner• Diffusion Burner• Cable
Tray &
Conduit Bend• Sprinkler Head• Hot Gas & Plume
Exposures• 18 Tests using MOV
CircuitCircuit
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 33 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
CAROLFIRE Cable Response to Live Fire
• 78 Small- and 18 Intermediate-scale tests• ac MOV and
Insulation Resistance Measurement
Systems used for failure mode diagnosticRIS 2004 03 & Fire
Model Improvement• RIS 2004-03 & Fire Model Improvement
Penlight Shroud
Cable Tray & Test Cables
A
A
A-A
Cable Tray Supports
A A-A0.81 m (2'-8") 0.51 m (1'-8 1/4")
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 44 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
DESIREE-FIREDirect Current Electrical Shorting In Response to
Exposure Fire
• Similar thermal exposure methods as CAROLFIRE• 59 small- and
17 intermediate scale tests
– 225 individual circuit trials
Ins lation resistance meas rement as not sed• Insulation
resistance measurement was not used• Several different dc control
circuits simulated NPP circuits
and monitored cable failure modes.and monitored cable failure
modes.– dc MOV– Medium Voltage Switchgear (15kV / 4.16kV)
Pil SOV– Pilot SOV– 1” SOV assembly– Large coil
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 55 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
g
-
Diagnostic Units
PA
DCCCS CABLE UNDER TESTFROM DISTRIBUTION CIRCUIT BREAKER
FUSE BLOCK
G
PAV
V
1750
NCA
C
YC1
R
A
V
VNC
+
VDC
NO
C
A
1750
10A
A
B
YO1
NA
A
VNC-
125
V
O
10A
A
SP
V
V
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 66 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
DESIREE-FIRES
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 77 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
CAROLFIRE ac Results – RIS 2004-03
• Inter-cable shorting less likely than Intra-• Inter-cable
between thermoset and thermoplastic is very small compared to
either common type
•No basis on number of failures to consider•No basis for taking
credit of CPT•Very low probability of ac hot shorts >20 minutes
in duration
•THIEF fire model
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 88 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Cable Damage Prediction Model – THIEF
• Thermally-Induced Electrical Failure (THIEF)• Provides a
numerical solution of the one dimensional heat• Provides a
numerical solution of the one-dimensional heat
conduction equations within a homogenous cylinder with fixed
temperature-independent properties
• Incorporated in CFAST and FDS fire models• User specifies
cable failure temperature
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 99 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Electrical PIRT
• Phenomena Identification and Ranking Table• Structured
approach to an expert elicitation• Structured approach to an expert
elicitation• Facilitated by Brookhaven National Laboratories• Group
of 8 electrical experts• Group of 8 electrical experts
– 4 NRC, National Laboratories– 4 EPRI, Utilities,
Contractors
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1010 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
PIRT Objectives
• Review test data, identify important phenomena that ff t bl /
i it f il d d th k thaffects cable/circuit failure mode, and then
rank the
phenomena and important influencing parameters.• Consensus on
longstanding post-fire safe-shutdownConsensus on longstanding post
fire safe shutdown
circuit issues.– MHIF, 3 phase proper polarity, CTs, etc.
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1111 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
PIRT Work
• PIRT panel identified lack of readily usable information from
multiple testing reportsfrom multiple testing reports
• NRC has initiative to provide a compilation NUREG document of
previous test results
• Focus on evaluating the data based on the key phenomena and
parameters identified by PIRT panel.
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1212 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Data Report Example – Failure Mode
80
Global Approach - Insultion Type
100%
60
52%
62%
100%40ount Fuse Clear
Spurious Actuation
44%
38%
51%56%
20
Co Spurious Actuation
Hot Short
HS/SA Possible
44%
0
20
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1313 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
0TP TS
-
Data Report Example – Raceway Routing Duration
Duration - Raceway Routing
300
400
MAX = 1345 MAX = 456
200
Seco
nds
q1
min
median
100
max
q3
0AIR CONDUIT TRAY AIR CONDUIT TRAY
Hot Short Spurious Actuation
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1414 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
PRA Expert Panel
• Electrical PIRT Panel results will be used by a follow-on
group of fire PRA expertsgroup of fire PRA experts
• PRA panel will revise EPRI best-estimate conditional
probabilities for circuit hot short/spurious actuations used p pin
fire PRA methods, along with developing new probabilities.
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1515 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
dc Circuits Project and Related Activities Questions
Questions ?Questions ?
Fire PRA Workshop, 2011Fire PRA Workshop, 2011Fire PRA Circuit
Analysis Fire PRA Circuit Analysis ActivitiesActivities
Slide Slide 1616 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
E h d Fi E t D t b tEnhanced Fire Events Database to Support
Fire PRA(A joint NRC-RES/EPRI project)( j p j )
Given by J.S. Hyslop, NRC/RES
Joint RES/EPRI Fire PRA WorkshopAugust and November 2011S Di
CA
A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute (EPRI)
San Diego, CA
-
Motivation
• Need for improved database identified by NFPA 805 FAQ
programprogram – FAQ 48 required an update of current fire events
database to
include 2001-2009 data address fire ignition frequency
• Updated, improved database will also serve more general fire
PRA needs of both NRC and industry
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 22 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Participants and Roles
• Joint project by RES and EPRIRES and EPRI collaborated on data
fields and criteria for severity– RES and EPRI collaborated on data
fields and criteria for severity classification
– EPRI taking the lead in collecting data and populating
database, with RES in an audit rolewith RES in an audit role
• SNL and INL under contract to RES; ERIN lead contractor to
EPRI
• Plan for a joint RES/EPRI report to be issued on project in
2012
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 33 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Improvements
• Expanded and improved data fieldsImproved Fire Ignition Source
Details– Improved Fire Ignition Source Details
– Improved Fire Detection and Suppression Response Details–
Improved Fire Event Severity Classification
• More complete data– Update expected to collect more data than
currently exists for total
1968-2000 period of existing database1968-2000 period of
existing database
• Expanded fields will capture important information relevant to
analyses unavailable in existing version.
• Each individual event description will also be more completeR
d d t f “ d t i d” d t
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 44 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• Reduced percentage of “undetermined” data
-
Improvements (cont.)
• Severity classification for applying database to frequency
expanded to be more transparent and reproducibleexpanded to be more
transparent and reproducible, although some judgment remains–
Generic rules to eliminate “false positives” for events under
the
it l ifi ti t dseverity classification generated
• Improving Consistency and Quality Assurance• Allowing for
Reference Data Source Traceability• Allowing for Reference Data
Source Traceability
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 55 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Event Derived/Inferred :Fire Severityy
• Four severity classificationsChallenging– Challenging
– Potentially Challenging– Not Challenging– Undetermined
• For challenging, the fire is further developed than for
potentially challengingpotentially challenging– Potentially
challenging fires evolve into challenging fires in fire
PRA model
• Thus, no PRA applications distinguish between potentially
challenging and challenging fires
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 66 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Applications
• Initial application will be fire ignition frequencyA ti l i li
ti ill b i• An essential companion application will be suppression
reliability– Some very minor fires kept in earlier database will be
removed in y p
update
• Expect true component frequencies will be developed once
component population data collected by Owners’once component
population data collected by Owners Groups (later than 2012
schedule cited earlier)
• Further qualitative insights on fires to be gained g g
Fire PRA Workshop, Fire PRA Workshop, 2010, San Diego &
Jacksonville2010, San Diego & JacksonvilleEnhanced Fire Events
DatabaseEnhanced Fire Events Database
Slide Slide 77 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
FIRE PRA METHODS AND RESEARCH UPDATE 2011RESEARCH UPDATE -
2011
Rick WachowiakSr Project Manager
EPRIFire Fire PRA Workshop 2011PRA Workshop 2011
San Diego CA and Jacksonville FLSan Diego CA and Jacksonville
FL
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 11 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Contents
• Fire Events Database
• Heat Release Rates for Electrical Cabinets
Fi M th d E t R i P l• Fire Methods Expert Review Panel
• Fire Modeling Application Guideg pp
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 22 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
FEDB Purpose and Objectives
The Electric Power Research Institute’s Fire Events Data Base is
the i i l f fi i id t ti l d t f i fi PRA
This project will improve the FEDB by:
principal source of fire incident operational data for use in
fire PRAs
s p oject p o e t e by• Including expanded and improved data
fields• Improving consistency and quality of information
I d fi t it l ifi ti• Improved fire event severity
classificationThese improvements support fire PRA:• Updated,
improved fire frequencies• Treatment of detection & suppression
effectiveness• Estimates of damaging fire frequencies and their
characteristics
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 33 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Scope and Cooperation with NRC under MOU
• Update data through 2009, and beyond as availableP i i l d t•
Principal data sources:
– Plant records, e.g. condition or corrective action reports
supplemented with available
– LERs, ENs– NEIL, EPIX reports – Plant specific data collected
for FPRAs
• Cooperative effort lead by EPRI with NRC under MOU– Database
software upgrades– Data field content and definitionsData field
content and definitions– Fire severity criteria– Beta testing
QA audit
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 44 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
– QA audit
-
Key Fire Event Data Base Features
• Event summary description
• Location and source characteristicsLocation and source
characteristics
• Fire duration, growth, and damage descriptive details
• Detection– Time(s)– Systems & equipment– Fire brigade and
other personnel role– Fire brigade and other personnel role
• Suppression– Time(s)– Systems & equipment– Fire brigade
and other personnel role
• Fire severity classification graded dependent on magnitude
and
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 55 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• Fire severity classification graded, dependent on magnitude
and impact details
-
Fire Event Severity Classifications
• The severity levels used in the updated FEDB are
“challenging”, “potentially challenging” and “not
challenging”potentially challenging , and not challenging
• The new “challenging” and “potentially challenging”
classifications combined are essentially equivalent to the
NUREG/CR-6850 y q“potentially challenging” classification
• A distinction made between “challenging” fires that did (or
could) d iti l t b d th i iti d thdamage a critical component
beyond the ignition source and those “potentially challenging”
fires that might evolve into challenging fires in fire PRA
model
• Initial classification using fire severity algorithm
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 66 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Fire Event Severity Determination
• Applied to new and existing fire event data (1990 forward)
• Fire event severity classification algorithm:
– Logic model using FEDB data field entries to indicate initial
fire severity classificationy
– Challenging → Potentially Challenging → Not Challenging
– Identifies key missing information needed to make
classification on “undetermined” eventson “undetermined” events
• Fire event severity classification review & justification
for exceptions requiredrequired
• Resolution of “undetermined” severity classifications
incorporated in event data collection and coding process to extent
practical
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 77 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Event Derived/Inferred: Fire Severity
Event Classification Event Sub-Classification Criteria
CHALLENGING Damage to or ignition of an adjacent object
occurred. This includes ignition
One of the following:
g g j j gof secondary combustibles.Damage to or ignition of an
adjacent object could have occurred if the fire were in a different
location.Damage to or ignition of an adjacent object or component
could haveDamage to or ignition of an adjacent object or component
could have occurred if significant suppression actions had not been
taken.
POTENTIALLYCHALLENGING
Damage to or ignition of an adjacent object could have occurred
if minor suppression actions were not taken in a timely manner.
Not “challenging” andone of the following:
Damage to or ignition of an adjacent object could have occurred
if the fire were in a different location and if minor suppression
actions were not taken in a timely manner.
NOT CHALLENGING Overheat condition only; no smoldering or
flaming combustion.
Not “potentially challenging” and one of the following:
Smoldering fire self-extinguishes without any active
intervention.
Fire involves an ignition source in a location that has no
relevance to plant operations or safety.
UNDETERMINED A fi t th t d t h ffi i t i f ti t l if
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 88 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
UNDETERMINED Any fire event that does not have sufficient
information to classify as challenging, potentially challenging, or
not challenging.
-
Fire Events Database Progress
Request CR “List” for Key Words (2 000 4 000 / plant)
1n = input from utilities required
(2,000 - 4,000 / plant)
Owner’s Groups Perform Screening Review
Request CRs for Probable Pl t di t t
m = Audit (NRC)
1
I t t
Request CRs for Probable Fires
(75 - 125 / plant)
EPRI Screen for Potential Significance
2 Plants responding to requests
Expect completion in 2011
2Important Existing FEDB
Fire Events(0 – 5 / plant)
Site Follow-up for “Real Fires”
(10 – 15 / plant)
3
2
Events in New FEDB
Potentially Challenging and Challenging Fires
EPRI CategorizeImportant
Fires(0-3/plant)
33rd audit in Nov 2011
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 99 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
Challenging Fires
-
Fire Ignition Frequency (Re)Analysis:Purpose, Objective, Scopep
, j , p
• Re-examine and update fire event trends and fire ignition
frequencies developed in EPRI interim Report 1016735 FAQ
08-0048developed in EPRI interim Report 1016735, FAQ 08-0048
• Use data from the FEDB updated through 2009
• Improved methods to address statistical issues/concerns for
low density fire ignition bins
R lt t b it bl f i l t ifi fi PRA li ti• Results to be suitable
for use in plant specific fire PRA applications
• Includes coordination with the NRC, industry technical
review
• Preparation of EPRI technical reports
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1010 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Fire Ignition Frequency (Re)Analysis: Technical Issues and
Approach
• Based on data from 1990-2000, between plant variability
detected– Strong indication for aggregated data, high density fire
ignition binsStrong indication for aggregated data, high density
fire ignition bins – Low density fire ignition bins indeterminate –
Approach assumes between plant variability
• Plan to apply hierarchical Bayes treatment for all fire
ignition bins; draft methodology report prepared and in review
• Uncertainty bounds & plant specific sensitivity will
generally increase while maintaining generic “results” for mean
fire ignition frequencies
• Industry wide trends and any implications unknown until new
data is available for analysis
• Use of pre 1990 data under discussion between RES and EPRI
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1111 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• Use of pre-1990 data under discussion between RES and EPRI
-
Fire Ignition Frequency (Re)Analysis: Status and Schedule
• Methodology report for technical review with NRC under MOU:
Comments received 2nd Qtr 2011Comments received 2 Qtr 2011
• Draft EPRI Interim Technical Report on methodology for
industry technical review: 4th Qtr 2011
• Draft EPRI Technical Report on updated FEDB fire ignition
frequency (re)analysis: 1st Qtr 2012
• Final EPRI Technical Report (methodology and data analysis):
Mid 2012
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1212 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Vertical Electrical Cabinet Heat Release RateProposed
Methodology
• Purpose of study: Re-evaluate the heat release rates (HRRs) of
cabinet fires recommended for use in NUREG/CR 6850 (Table G
1)cabinet fires recommended for use in NUREG/CR-6850 (Table
G-1)
• Scope limited to:– Vertical electrical cabinets– No
quantification of external influences– No quantification of fire
duration
• Model developed to characterize• Model developed to
characterizepotential HRR for cabinet fires
– Cabinet size and combustible load– Ventilation
characteristics– Types of combustibles
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1313 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Vertical Electrical Cabinet Heat Release Rate ModelProposed
Methodology
• Model maintains distinction between qualified cable and
non-qualified cable fires
• Establish probability that fire in a cabinet with only
qualified cables may remain localized
• Model adds refinements and thus more inputs needed than in
NUREG/CR-6850:6850:– If not ventilation-limited: HRR dependent on
combustible loading.
Combustible loading estimated based on:• Cabinet volume•
Estimate of cabinet fullness (low/high loading).
– If ventilation-limited: HRR controlled by amount of air
available for combustion.• Determination on whether cabinet is
cooled by forced or naturalDetermination on whether cabinet is
cooled by forced or natural
ventilation• Assessment of robustness regarding gap potential•
Need to know vent area and position of vents (top, bottom, or vents
at
i t di t l l)
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1414 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
intermediate level)
-
Vertical Electrical Cabinet Heat Release RateProposed
Methodology
Current StatusI d d t t i l• Independent expert review panel–
Fire modeling and fire PRA practitioners– Mix of contractors and
utilityy– Verify that the method is correct, has proper bases, and
is
useable
• Comments received and are being resolved• Comments received
and are being resolved• Expected to be published in 2011• NRC
requested formal review by NRC-RESNRC requested formal review by
NRC RES
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1515 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
FPRA Unreviewed Analysis Methods Review Panel
• NEI 07-12 allows Fire PRA peer reviews to identify “unreviewed
analysis methods”unreviewed analysis methods
• Panel process established to provide a review for any new
methods– 6 to 10 members – Utilities, EPRI, Owners’ Groups, NRC–
Independent from developer and user(s) of method(s)
Review proposed method and provide comments– Review proposed
method and provide comments– Determine the applicability /
limitations of the method– Identify interface with the Fire PRA
Standard
• EPRI to “publish” approved methods via letter to NEI–
Eventually provided as a collection in an EPRI report
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1616 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Panel Status
• ERIN Engineering and Research, Inc. submitted four methods
–Alignment factors for:g– Electrical cabinet fires– Pump oil fires–
Transient firesTransient fires– Hot work fires
• Each method attempts to add realism to a fire PRAProposition
is that fires included in the generic frequencies do not–
Proposition is that fires included in the generic frequencies do
not generally behave as aggressively as the Fire PRA treats
them
• Review of methods as submitted is complete and there are
significant commentscomments
• ERIN is resolving comments• Each of the methods will need to
be re-reviewed following update of
h d i
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1717 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
the documentation
-
Insights From the Panel Process
• Methods that treat all scenarios the same are more difficult
to justifymore difficult to justify– Tie method to scenario
specific
information– Specify information needed to justify m
in M
etho
d
Specify information needed to justify applicability
• Methods relying on expert judgment may put the panel into a
different role on
serv
atis
m
may put the panel into a different role– Expert panel vs.
independent review– Different process may be needed when in this
role
S i ifi l d d
Co
Generic Applicability
• Scenario specific examples needed• Involve the author earlier
in the process• Review one method at a time
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1818 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
Review one method at a time
-
Fire Modeling Application Guide
• Joint EPRI / NRC RES publication under MOUD ib th f d ti fi d
li• Describes the process of conducting a fire modeling analysis
for commercial nuclear power plant applications
• Provides guidance on incorporating the uncertaintyProvides
guidance on incorporating the uncertainty associated with a fire
modeling analysis in a Fire PRA
• Five fire models discussed– Two empirical, two zone, one
CFD
• Eight “real world” examples providedApplicability of models
and data ranges– Applicability of models and data ranges
• Draft is out for public comment– This forms the bases for
Module 5 – Advanced Fire Modeling
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA New Methods
UpdateFire PRA New Methods Update
Slide Slide 1919 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
g
-
EPRI/NRC-RES FIRE PRA METHODOLOGY AND ITS RELATIONSHIP TO NRC’s
REGULATORY STRUCTURE
Mary DrouinU.S. Nuclear Regulatory Commission
Fire PRA Workshop 2011Fire PRA Workshop 2011San Diego CA and
Jacksonville FLSan Diego CA and Jacksonville FL
A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute (EPRI)
-
How Does NUREG/CR-6850 Fit into the NRC Regulatory Structure?g
y
• The objective here is to provide an understanding, j p g,from
a regulatory perspective, the need for a fire probabilistic risk
assessment (PRA) methodology d t d th f it l i th l tdocument, and
therefore, its role in the regulatory structure.
• A major aspect of this objective is understanding what is
meant by regulatory structure.what is meant by regulatory
structure.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 22 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
NRC Regulatory Structure
• Congressional MandateAtomic Energy Act indicates that the
mission of the NRC is to– Atomic Energy Act indicates that the
mission of the NRC is to ensure that commercial nuclear power
plants are operated in a manner that provides adequate protection
of public health and safety and is consistent with the common
defense and securitysafety and is consistent with the common
defense and security.
• NRC provides for public health and safety via a licensing,
oversight and enforcement process.
• Licensing, oversight and enforcement all involve establishing
regulations and developing the necessary supporting structure (e g
regulatory guides)supporting structure (e.g., regulatory
guides).
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 33 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
What is the Relationship Between a Regulation and a Methodology
Document?gy
REGULATIONS Defines technical requirements for the design and
operation of the(e.g., 10 CFR Part 50) the design and operation of
the nuclear power plant
REGULATORY GUIDES
Provides one technical approach that is acceptable for meeting
the
regulation
SUPPORTING TECHNICAL
Technical documents provide detailed guidance on issues
i t d ith ti thTECHNICAL GUIDANCE
associated with meeting the approach established in the
regulatory guide (or regulation)
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 44 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
What is the Relationship in the Context of a Fire PRA?
• Example relevant regulations:10 CFR §50 48(c) Fire Protection
National Fire Protection Association– 10 CFR §50.48(c), Fire
Protection, National Fire Protection Association Standard NFPA
805
– 10 CFR §50.69, Risk-informed categorization and treatment of
structures, systems and components for nuclear power
reactorssystems and components for nuclear power reactors
– 10 CFR §50.90, Application for amendment of license,
construction permit, or early site permit
– 10 CFR §50.36, Technical Specifications10 CFR §50.36,
Technical Specifications
• What is the common element among these regulations?– The use
of risk information, and therefore, the need to have confidence
in the risk analyses (or PRAs) being used to generate the
informationin the risk analyses (or PRAs) being used to generate
the information– Risk contributors to be addressed include internal
fires.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 55 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
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How is This Confidence Achieved?
REGULATIONS10 CFR §50 48(c) 10 CFR §50 69 10 CFR §50 90 10 CFR
§50 36 etc10 CFR §50.48(c) 10 CFR §50.69 10 CFR §50.90 10 CFR
§50.36 etc.
RG 1.205 RG 1.201 RG 1.174 RG 1.177
Guidance/staff position includes use of risk/PRA information
Reference to RG 1.200 for guidance on determining PRA technical
acceptability for both internal and external hazards (e.g.,
internal fire)acceptability for both internal and external hazards
(e.g., internal fire)
RG 1.200
“Describes one acceptable approach for determining whether the
technical adequacy of the PRA, in total or the parts that are used
to support an application, is sufficient to provide confidence in
the results, such that the PRA can be used in regulatory
decision-making for light-
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 66 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
water reactors.”
-
How is This Confidence Achieved (cont’d)?
• The approach provided in RG 1.200 defines the attributes and
characteristics of a technically acceptable PRA.– The defined
attributes and characteristics are very high level.
• For example, characteristics and attributes provided in RG
1.200 for Fire Ignition Frequencies:– Frequencies are established
for ignition sources and– Frequencies are established for ignition
sources and
consequently for physical analysis units.– Transient fires
should be postulated for all physical analysis units
regardless of administrative controls.g– Appropriate
justification must be provided to use nonnuclear
experience to determine fire ignition frequency.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 77 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
How is This Confidence Achieved (cont’d)?
• RG 1.200 allows the use of a consensus standard (as endorsed
by the NRC) with a peer review to demonstrate conformance with the
defined attributes and characteristics.– RG 1.200 endorses and
provides a position on the ASME/ANS PRA p p
Standard (ASME/ANS RA-Sa-2009).– Part 4 of the ASME/ANS standard
provides the requirements for
fires at-power PRA.
• The PRA Standard, however, only defines what is required for a
technically acceptable PRA and an acceptable peer reviewreview.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 88 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
How is This Confidence Achieved (cont’d)?
• Guidance is needed for how to accomplish the requirements in
the standard and guidance isrequirements in the standard and
guidance is needed for the peer review in determining whether the
intent of requirement is met.
• This guidance is particularly needed for those aspects in the
PRA where the model is not well knownknown.
• One major objective of NUREG/CR-6850 is to provide the
detailed guidance for how to p gaccomplish meeting the requirements
for Fire PRA.– As such, NUREG/CR-6850 supports both the PRA
standard and the PRA peer review guidance
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 99 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
standard and the PRA peer review guidance
-
Overall Relationship
REGULATIONS( 10 CFR P t 50)
§50.48(c) §50.69 §50.90 §50.36 etc. (e.g., 10 CFR Part 50)
REGULATORY RG 1.205 RG 1.201 RG 1.174 RG 1.177 etc.
GUIDESRG 1.200
PRA Standard and Peer Review(ASME/ANS RA-Sa-2009 and
NEI-07-12)
“WHAT TO” SUPPORTING TECHNICAL GUIDANCE
PRA Technical
Acceptability
DETAILED “HOW TO” SUPPORTING TECHNICAL
GUIDANCE
NUREG/CR-6850NUREG-1855NUREG-1842NUREG/CR-6823etc.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1010 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
etc.
-
Structure of PRA Standard
Hazard Type • Two different hazard types are defined in the
Standard which include both internal and external hazards.
Hazard groups• For each hazard type, the various groups of
hazards are
defined, for example for internal hazards: internal events,
internal flood and internal fires.
Technical Elements
Objectives
• For each hazard group, the technical elements are defined for
developing the hazard-specific PRA model.
• The objective of each technical element is
definedObjectives
High Level Requirements
(HLRs)
• The objective of each technical element is defined.
• High level requirements are defined which specify what is
needed to accomplish the defined objective of the technical
element(HLRs)
Supporting Requirements
technical element.
• Supporting requirements are defined which, in turn, specify
what is needed to accomplish the defined high l l i t
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1111 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
(SRs) level requirement.
-
Structure of PRA Standard (cont’d)
• At the supporting requirement level, it was recognized that
the extent or to which the level of detail, the level of plant
specificity and the level of realism of the PRA model can vary
• Consequently, the minimum defined by the requirement can
alsoConsequently, the minimum defined by the requirement can also
vary
• Consequently, three “categories of capability” were defined
for the supporting requirementssupporting requirements.
• Capability Category I: the very basic needed.
• Capability Category II: the minimum to support majority of
applications
• Capability Category III: the minimum to support application
with high reliance on the fidelity of the PRA results.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1212 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Standard Capability Categories
Capability Category I • Level of p y g
yminimum addressed by the
technical requirementdetail of plant model
Pl t d i
Supporting Requirement
Capability Category II minimum to achieve
“current good practice” for the technical requirement
•
Plant design and operational specificity
Specifies the minimum with regard to level of detail,
plant design and q
Capability Category III minimum to achieve the
• Realism of plant response
operational specificity, and realism of plant
response
state‐of‐the‐art for the technical requirement
p
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1313 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
Standard Capability Categories (cont’d)
PRA Attribute Capability Category I Capability Category II
Capability Category III
Scope and Level of Detail
Sufficient to identify relative importance at the system
or train level
Sufficient to identify relative importance of significant
component level contributors
Sufficient to identify relative importance of all component
level
contributors
G /Plant-Specificity
Generic data/models except for unique design and operational
features
Plant-specific data/models for the significant contributors
Plant-specific data/models for all contributors
Realism Departures from realism ill h d t i t*Departures from
realism will
h ll i t*Departures for realism will
h li ibl i t*will have moderate impact* have small impact* have
negligible impact*
*Differentiation from moderate, to small, to negligible is
determined by the degree that the conclusions and risk insights
could affect a g gdecision under consideration.
• Moderate: likely that a decision could be affected• Small:
unlikely a decision could be affected
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1414 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
• Negligible: a decision would not be affected.
-
Illustration of Fire PRA Standard Structure and
NUREG/CR-6850
Hazard Type Internal Hazards External Hazards
Hazard groupsSeismic EventsHi h Wi d
Internal EventsHazard groups High Winds
External FloodsOther External Hazards
Technical
Internal FloodsInternal Fires
Plant Partitioning Fire Ignition FrequencyEquipment Selection
Quantitative ScreeningCable Selection Circuit Failure
Fire PRA Elements
Objectives The objectives of the equipment selection elements is
to select the plantequipment that will be included/credited in Fire
PRA plant response model.
Cable Selection Circuit FailureQualitative Screening Human
Reliability AnalysisPlant Response Model Risk QuantificationFire
Scenario Selection Seismic/Fire Interactions
Standard
High Level Requirements
(HLRs)
HLR‐ES‐A
The Fire PRA shall identify equipment whose failure . . . .HLR‐ES‐B
The Fire PRA shall identify equipment whose failure including spurious operation
would adversely affect the operability/functionality of that portion of the plantdesign to be credited in the Fire PRA.
HLR‐ES‐C
the Fire PRA shall identify instrumentation . . . .HLR‐ES‐D
The Fire PRA shall document the Fire PRA equipment selection
Supporting Requirements
HLR‐ES‐D
The Fire PRA shall document the Fire PRA equipment selection . . . .
ES‐B1 Capability Category I Capability Category II Capability Category III
IDENTIFY Fire Safe Shutdown/
IDENTIFY Fire Safe Shutdown/
IDENTIFY Fire Safe Shutdown/Appendix R equipment to be
Appendix R equipment to be
Appendix R equipment to becredited in the Fire
PRA credited in the Fire PRA and credited in the Fire PRA and
NUREG/CR 6850
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1515 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
q(SRs)
credited in the Fire PRA.
credited in the Fire PRA and
credited in the Fire PRA andINCLUDE risk‐significant
INCLUDE all equipment fromequipment from the IE PRA
the IE PRA
CR-6850
-
Fire PRA Standard and NUREG/CR-6850: Illustration of the Mapping
of HLRs & SRs to 6850
Technical element
HLR SR 6850/1011989 sections that
cover SR
Comments
ES A The Fire PRA shall identify equipment whose failure caused
by an initiating fire including spurious y q p y g g poperation
will contribute to or otherwise cause an initiating event.
1 2.5.3 2 3.5.3 Covered in “Cable Selection” chapter 3 2.5.3 4
2.5.1, 2.5.4
5 2 5 4 5 2.5.4 6 2.5.6 B The Fire PRA shall identify equipment
whose failure including spurious operation would
adversely affect the operability/functionality of that portion
of the plant design to be credited in the Fire PRA.
1 2.5.2 2 2.5.4 3 5.5.1 Covered in “Fire-Induced Risk Model”
chapter 4 3.5.3 Covered in “Cable Selection” chapter 5 n/a
Exclusion based on probability is not covered in 6850/1011989 C The
Fire PRA shall identify instrumentation whose failure including
spurious operation would
impact the reliability of operator actions associated with that
portion of the plant design to be p y p p p gcredited in the Fire
PRA.
1 2.5.5 2 2.5.5 D The Fire PRA shall document the Fire PRA
equipment selection, including that information about
the equipment necessary to support the other Fire PRA tasks
(e.g., equipment identification; equipment type; normal desired
failed states of equipment; etc ) in a manner that facilitates
Fire
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1616 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
equipment type; normal, desired, failed states of equipment;
etc.) in a manner that facilitates Fire PRA applications, upgrades,
and peer review.
1 n/a Documentation not covered in 6850/1011989
-
Overall Process
When implementing RG 1.200, PRA technical acceptability
involves:
ASME/ANS Developing a PRA in accordance to
the technical
Technical requirements in the PRA Standard
describe what needs to be in the PRA, but do not describe how
to
RG
RA-Sa-2009
PRA
the technical requirements of the Standard (as
endorsed by NRC)
build the PRA model
NUREG/CR 6850
Provides guidance for one acceptable
methodology that canRG 1.200
PRA Model
Performing a peer review (as endorsed A i i i d t
NUREG/CR-6850 methodology that can be used for how to
develop PRA and meet the PRA Standard
NEI 07-12review (as endorsed by NRC) to assess
whether the technical requirements were
actually met
A peer review is required to evaluate how the PRA
model was built to determine whether it meets the intent of the
technical requirements in
the PRA Standard
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1717 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
the PRA Standard
-
Summary/Conclusion
G/C• NUREG/CR-6850 is a methodology document and, while not
required to be
fmet, plays a major role in defining a technically acceptable
Fire PRA to support NRC i i i h Fi PRA d l iNRC activities where a
Fire PRA model is needed and the results of the Fire PRA
d l d l imodel are used to meet a regulation.
Fire PRA Workshop 2011, San Diego & Jacksonville Fire PRA
Workshop 2011, San Diego & Jacksonville Fire PRA Methodology
and its Relationship to NRC’S Regulatory Structure
Slide Slide 1818 A Collaboration of U.S. NRC Office of Nuclear
Regulatory A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute
(EPRI)Research (RES) & Electric Power Research Institute
(EPRI)
-
EPRI/NRC RES FIRE PRAEPRI/NRC-RES FIRE PRA
METHODOLOGYIntroduction and Overview: the Fire PRA M h d l d C
SMethodology and Course Structure
Steve Nowlen - Sandia National LaboratoriesSteve Nowlen - Sandia
National LaboratoriesBijan Najafi - Science Applications
International Corp.Joint RES/EPRI Fire PRA Training WorkshopSan
Diego, CA, August 1-5, 2011 andJacksonville, FL, November 14-18,
2011
A Collaboration of U.S. NRC Office of Nuclear Regulatory
Research (RES) & Electric Power Research Institute (EPRI)
Jacksonville, FL, November 14 18, 2011
-
Overview of this morning’s presentations
I. A brief overview of the course structure, content and
objectivesobjectives
II. User experience – industry and NRCIII. An overview of the
ASME/ANS PRA StandardIII. An overview of the ASME/ANS PRA
StandardIV. Ongoing projects and activities related to fire PRA
– Fire Event Database update activity– Supplemental methods
development efforts and the NRC/industry
peer review panel– Ongoing efforts on fire-induced circuit
failure mode and likelihood g g
analysis (recent testing, PIRT panel, PRA expert panel)
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 22 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
PART IPART I
A brief Overview of the A brief Overview of the EPRI/NRCEPRI/NRC
RES Fire PRA MethodologRES Fire PRA MethodologEPRI/NRCEPRI/NRC--RES
Fire PRA MethodologyRES Fire PRA Methodology
&&
The Fire PRA CourseThe Fire PRA Course
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 33 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Course Structure
• Five parallel modules:1. PRA/Systems Analysis2. Electrical
Analysis3. Fire Analysis4. Fire PRA Human Reliability Analysis
(HRA)5. Advanced Fire Modeling
• General structure for each module:– PowerPoint presentations
covering key concepts and the general “how
” f h kto” of each task– Example problems to illustrate key
elements
• Our intent is that you participate actively in the
discussionsA k ti !– Ask questions!
– Instructors will both encourage and moderate discussions– They
may also closure if discussion gets off-track (e.g., we cannot
solve
your regulatory questions)
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 44 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
your regulatory questions)
-
OVERVIEW OF FIRE PRA PROCESS AND MODULE STRUCTURE
TASK 1: Plant Boundary & Partitioning
TASK 2: Fire PRA Component Selection
TASK 3: Fire PRA Cable Selection
TASK 4 Q lit ti S i TASK 5: Fire Induced RiskSUPPORT TASK A:
Plant
W lk D TASK 4: Qualitative Screening
TASK 6: Fire Ignition Frequencies
TASK 5: Fire-Induced Risk Model
Walk Downs
TASK 7A: Quantitative Screening - I
TASK 8: Scoping Fire Modeling
SUPPORT TASK B: Fire PRA Database TASK 12A: Post-Fire HRA:
Screening
Fire Analysis Module
TASK 7B: Quantitative Screening - II
PRA/System Module
Circuits Module
HRA Module
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 55 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
B Fire Analysis and Fire Modeling Modules
-
OVERVIEW OF FIRE PRA PROCESS AND MODULE STRUCTURE (2)( )
Detailed Fire Scenario Analysis
B
TASK 11: Detailed Fire Modeling A. Single CompartmentB.
Multi-Compartment C. Main Control Room
TASK 9: Detailed Circuit Failure Analysis
TASK 10: Circuit Failure Mode & Lik lih d A l iLikelihood
Analysis
TASK 12B: Post fire HRA:TASK 14: Fire Risk Quantification
TASK 15: Uncertainty & Sensitivity Analyses
TASK 12B: Post fire HRA: Detailed & recoveryTASK 13:
Seismic-Fire
Interactions
Fire Analysis Module
PRA/System ModuleSensitivity Analyses
TASK 16: Fire PRA Documentation
Circuits Module
HRA Module
Fire Analysis and Fire Modeling Modules
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 66 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Module 1: PRA/Systems Analysis
• This module cover analysis elements related to plant systems
accident• This module cover analysis elements related to plant
systems accident response modeling, integration of human actions
into the plant model, and risk quantification tasks
S ifi t k d• Specific tasks covered are:– Task 2: Equipment
Selection– Task 4: Qualitative Screening– Task 5: Fire-Induced Risk
Model– Task 7: Quantitative Screening– Task 15: Risk
Quantification– Task 16: Uncertainty Analysis
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 77 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Module 2: Electrical Analysis
• This module covers analysis elements related to the
identification andThis module covers analysis elements related to
the identification and tracing of cables, and the analysis of
electrical circuit failure modes and likelihood
• Tasks covered are:– Task 3: Cable Selection (and Routing)–
Task 9: Detailed Circuit Analysisy– Task 10: Failure Mode
Likelihood Analysis– Support Task B: FPRA Database
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 88 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Module 3: Fire Analysis
• This module covers analysis elements related to the
identification, characterization and analysis of fires scenarios–
fire sources, fire frequency, fire damage, and fire protection
systems and
features,
• Tasks covered are:T k 1 Pl t P titi i– Task 1: Plant
Partitioning
– Task 6: Fire Ignition Frequency– Task 8: Scoping Fire
Modeling– Task 11: Detailed Fire Scenario Analysis– Task 13:
Seismic/Fire Interactions (briefly)– Support Task A: Plant
Walkdowns
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 99 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Module 4: Fire PRA Human Reliability Analysis
• Second year for fire HRA module– Updated based on last year’s
roll-out experience and refinements to the reference p y p
document (NUREG-1921, TR1019196, draft for comment)
• Covers fire PRA analysis elements related to the
identification of human failure events (HFEs) and quantification of
human error probabilities (HEPs)
• Tasks covered:– Task 12a: screening level HRAg– Task 12b:
detailed HRA quantification
• Note: EPRI/RES guidance includes an intermediate “scoping”
approachApproach more realistic than screening yet lacks detail and
realism of– Approach more realistic than screening, yet lacks
detail and realism of detailed HRA quantification
– Instructors will explain how this fits into overall analysis
framework
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 1010 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Module 5: Advanced Fire Modeling (New!)
• Covers the use of computational fire models in support of fire
scenario screening and analysisscreening and analysis
• Reference: RES/EPRI NPP Fire Modeling Application Guide
(NUREG-1934, TR1023259, draft for comment)
• From handbook correlations to computational fluid dynamicsFrom
handbook correlations to computational fluid dynamics…
• Fire modeling tools support:– Task 8: Scoping Fire
Modeling
Task 11: Detailed Fire Scenario Analysis– Task 11: Detailed Fire
Scenario Analysis
• Intended as a complement to the fire analysis module 3:–
Module 3 focuses on the overall structure and content of the fire
analysis elements
M d l 5 f th t l f t ti l fi d l– Module 5 focuses on the actual
use of computational fire models
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 1111 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Another element that you will see in training is citations to
the PRA Quality Standardy
• ASME/ANS RA-Sa–2009:– Addenda to ASME/ANS RA-S-2008: Standard
for Level 1/Large EarlyAddenda to ASME/ANS RA S 2008: Standard for
Level 1/Large Early
Release Frequency Probabilistic Risk Assessment for Nuclear
Power Plant Applications
• The training slides provide links from elements of the
methodology to g p gyrequirements of the standard– Not intended to
“teach” the standard– Intended to provide a road map between the
methods and the standard’s p p
Supporting Requirements• A separate presentation this morning
will provide a high-level
introduction to the standard, it’s structure, and it’s
placep
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 1212 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
Any questions before we move on?Any questions before we move
on?Any questions before we move on?Any questions before we move
on?
Fire PRA Training, 2011, San Diego CA and Jacksonville FLFire
PRA Training, 2011, San Diego CA and Jacksonville FLIntroduction
and OverviewIntroduction and Overview Slide Slide 1313 A
Collaboration of U.S. NRC Office of Nuclear Regulatory A
Collaboration of U.S. NRC Office of Nuclear Regulatory Research
(RES) & Electric Power Research Institute (EPRI)Research (RES)
& Electric Power Research Institute (EPRI)
-
EPRI/NRC-RES Fire PRA Course
Revision Date: June 21, 2011
Electric Power Research Institute (EPRI) Division of Risk
Analysis 3412 Hillview Avenue Office of Nuclear Regulatory Research
(RES) Palo Alto, CA 94303 U.S. Nuclear Regulatory Commission
Washington, DC 20555
-
2
-
iii
PREPARERS
TECHNICAL TEAM LEADS:
Bijan Najafi
Science Applications International Corp. 1671 Dell Ave, Suite
100 Campbell, CA 95008
Steven P. Nowlen
Sandia National Laboratories (SNL) PO Box 5800 Albuquerque, NM
87185-0748
PROJECT MANAGERS:
Richard Wachowiak
Electric Power Research Institute
J. S. Hyslop
U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory
Research Fire Research Branch
-
v
CONTENTS
1 INTRODUCTION
....................................................................................................................
1-1
1.1 Background
..................................................................................................................
1-1
1.2 How to Use this Package
.............................................................................................
1-4
1.3 References
..................................................................................................................
1-4
2 EXAMPLE CASE PLANT - GENERAL INFORMATION
.........................................................
2-1
2.1 Overall Plant Description
.............................................................................................
2-1
2.2 Systems Description
....................................................................................................
2-1
2.2.1 Primary Coolant System
..........................................................................................
2-1
2.2.2 Chemical Volume Control and High Pressure Injection
Systems ............................ 2-2
2.2.4 Residual Heat Removal System
..............................................................................
2-3
2.2.5 Auxiliary Feedwater System
....................................................................................
2-3
2.2.6 Electrical System
.....................................................................................................
2-5
2.2.7 Other Systems
.........................................................................................................
2-5
2.3 Plant Layout
.................................................................................................................
2-6
2.4 SNPP
Drawings..............................................................................................................
2-6
3 MODULE 1: PRA/SYSTEMS
..................................................................................................
3-1
4 MODULE 2: ELECTRICAL ANALYSIS
...................................................................................
4-1
5 MODULE 3: FIRE ANALYSIS
.................................................................................................
5-1
6 MODULE 4: FIRE PRA HUMAN RELIABILITY ANALYSIS
.................................................... 6-1
7 MODULE 5: ADVANCED FIRE MODELING
..........................................................................
7-2
-
vii
LIST OF ACRONYMS
AFW Auxiliary Feedwater ATWS Anticipated Transient Without Scram
BWR Boiling Water Reactor CCDP Conditional Core Damage Probability
CF Cable (Configuration) Factors CCW Component Cooling Water CDF
Core Damage Frequency CFD Computational Fluid Dynamics CFR Code of
Federal Regulations CLERP Conditional Large Early Release
Probability CM Corrective Maintenance CRS Cable and Raceway
(Database) System CVCS Chemical and Volume Control System EDG
Emergency Diesel Generator EF Error Factor EOP Emergency Operating
Procedure EPR Ethylene-Propylene Rubber EPRI Electric Power
Research Institute FEDB Fire Events Database FEP Fire Emergency
Procedure FHA Fire Hazards Analysis FIVE Fire-Induced Vulnerability
Evaluation (EPRI TR 100370) FMRC Factory Mutual Research
Corporation FPRAIG Fire PRA Implementation Guide (EPRI TR 105928)
FRSS Fire Risk Scoping Study (NUREG/CR-5088) FSAR Final Safety
Analysis Report HEAF High Energy Arcing Fault HEP Human Error
Probability HFE Human Failure Event HPI High Pressure Injection
HPCI High Pressure Coolant Injection HRA Human Reliability Analysis
HRR Heat Release Rate HVAC Heating, Ventilation, and Air
Conditioning ICDP Incremental Core Damage Probability ILERP
Incremental Large Early Release Probability
-
viii
IPE Individual Plant Examination IPEEE Individual Plant
Examination of External Events IS Ignition Source ISLOCA
Interfacing Systems Loss of Coolant Accident KS Key Switch LERF
Large Early Release Frequency LFL Lower Flammability Limit LOC Loss
of Control LOCA Loss of Coolant Accident MCC Motor Control Center
MCR Main Control Room MG Motor-Generator MOV Motor Operated Valve
MQH McCaffrey, Quintiere and Harkleroad’s Method MS Main Steam NC
No Consequence NEI Nuclear Energy Institute NEIL Nuclear Electric
Insurance Limited NFPA National Fire Protection Association NPP
Nuclear Power Plant NPSH Net Positive Suction Head NQ cable
Non-Qualified (IEEE-383) cable NRC Nuclear Regulatory Commission
P&ID Piping and Instrumentation Diagram PE Polyethylene PM
Preventive Maintenance PMMA Polymethyl Methacrylate PORV Power
Operated Relief Valve PRA Probabilistic Risk Assessment PSF
Performance Shaping Factor PVC Polyvinyl Chloride PWR Pressurized
Water Reactor Q cable Qualified (IEEE-383) cable RCP Reactor
Coolant Pump RCS Reactor Coolant System RDAT Computer program for
Bayesian analysis RES The Office of Nuclear Regulatory Research (at
NRC) RHR Residual Heat Removal RPS Reactor Protection System RWST
Refueling Water Storage Tank SDP Significance Determination Process
SGTR Steam Generator Tube Rupture SI Safety Injection SO Spurious
Operation SOV Solenoid Operated Valve SRV Safety Relief Valve
-
ix
SSD Safe Shutdown SSEL Safe Shutdown Equipment List SUT Start-up
Transformer T/G Turbine/Generator TGB Turbine-Generator Building
TSP Transfer Switch Panel UAT Unit Auxiliary Transformer VCT Volume
Control Tank VTT Valtion Teknillinen Tutkimuskeskus (Technical
Research Centre of Finland) XLPE Cross-Linked Polyethylene ZOI Zone
of Influence
-
1-1
1 INTRODUCTION
1.1 Background
The U.S. Nuclear Regulatory Commission and Electric Power
Research Institute under a Memorandum of Understanding (MOU) on
Cooperative Nuclear Safety Research have been developing state of
the art methods for conduct of fire PRA. In September 2005, this
work produced the “EPRI/NRC-RES Fire PRA Methodology for Nuclear
Power Facilities,” EPRI 1011989, and NUREG/CR-6850 [1].
A Fire PRA Course has been put together to train interested
parties in the application of this methodology. The Course/Seminar
is provided in five parallel modules. The first three modules are
based directly on Reference [1]. However, that document did not
cover fire human reliability analysis (HRA) methods in detail. For
2010, the training materials were enhanced to include a fourth
module based on a more recent EPRI/RES collaboration and a draft
guidance document, EPRI 1019196, NUREG-1921 [2] published in late
2009. The training materials are based on this draft document
including the consideration of public comments received on the
draft report and the team’s responses to those comments. For 2011 a
fifth training module on Ad