Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design WP1.5 Progress Meeting KTH / Stockholm, May 22-23, 2007 G. Bandini, P. Meloni, M. Polidori Italian Agency for new Technologies, Energy and Environment, Advanced Physics Technology Division Via Martiri di Monte Sole 4, 40129 Bologna, Italy EUROTRANS – DM1
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Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design
WP1.5 Progress Meeting KTH / Stockholm, May 22-23, 2007. EUROTRANS – DM1. Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design. G. Bandini, P. Meloni, M. Polidori. Italian Agency for new Technologies, Energy and Environment, Advanced Physics Technology Division - PowerPoint PPT Presentation
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WP1.5 Progress MeetingKTH / Stockholm, May 22-23, 2007
G. Bandini, P. Meloni, M. Polidori
Italian Agency for new Technologies, Energy and Environment,Advanced Physics Technology Division
Via Martiri di Monte Sole 4, 40129 Bologna, Italy
EUROTRANS – DM1
Objectives
Support the design phases of EFIT reactor with safety analysis at nominal and accidental conditions starting from:
development of a Neutronic/Thermal-Hydraulic coupled model of EFIT Subcritical Reactor for PARCS v1.01 /RELAP5 3.2.2 code, just widely used in PDS-XADS project
adaptation of the model for the new versions of the codes to take advantage of the multigroup diffusion equation solution in hexagonal geometry of PARCS v2.4 and the upgrade at the RELAP5 mod3.3
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
EFIT Core Section
Target Unit 19 Central Positions
Active Zone Positions 180
Inner Zone 42 FA
Intermediate Zone 66 FA
Outer Zone 72 FA
Reflector Zone 252 Positions
For Dummy Assemblies and Absorber Elements
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
Target
Inner Fuel
Middle Fuel
Outer Fuel
Box Dummy
Neutronic Design
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
Inner, Mid, Outer zones and dummy+bypass are represented
Average and hot hydraulic channel for Inner, Middle and Outer core with equivalent flow area coupled with corresponding pin heat structures
The hydraulic channels are chocked to correctly distribute mass flowrate
Average pin, hot SA and hot pin modelled with 12 axial nodes to simulate axial and radial power distribution
CERCER Fuel properties for Inner (57%MgO 43%MOX), Middle and Outer (50%MgO 50%MOX) are considered Cladding material is a ferritic-martensitic steel (T91) with aluminium coating
Gap conductivity tuned with SIM-ADS code
Lead heat transfer coefficient Subbotin correlation
RELAP5 Model of EFIT Core
8.0025.00.5 PeNu
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions.
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions.
MWth Inner zone 94
Intermediate zone 140 Outer zone 141
Out of fuel assemblies 9 Total 384
Max power in assembly:
fuel+coolant+ structures (MWth)
Max power in assembly:
only fuel (MWth)
Hottest pin in the hottest assemblies (only fuel)
(kW)
Axial form
factor in the hottest assemblies
Hottest pin / average pin (inside the
hottest assemblies)
Max linear power in pin
(W/cm) Inner zone 2.46 2.28 16.4 1.13 1.21 203 Mid zone 2.35 2.19 13.7 1.18 1.05 177
Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions.
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007
Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions.
MWth Inner zone 94
Intermediate zone 140 Outer zone 141
Out of fuel assemblies 9 Total 384
Max power in assembly:
fuel+coolant+ structures (MWth)
Max power in assembly:
only fuel (MWth)
Hottest pin in the hottest assemblies (only fuel)
(kW)
Axial form
factor in the hottest assemblies
Hottest pin / average pin (inside the
hottest assemblies)
Max linear power in pin
(W/cm) Inner zone 2.46 2.28 16.4 1.13 1.21 203 Mid zone 2.35 2.19 13.7 1.18 1.05 177
Outer zone 2.43 2.29 15.0 1.20 1.10 197
Steady State at MCNPX Nominal Conditions(the whole Power generated in fuel pellets)
(*) At max linear power elevation(**) At max core elevation
EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007