Forwards responses to Questions 1,2,3,5 & 6 of SEP Topic ...

REBULATOR'NPORMATI ON DISTRIBUTION STEM (RIBS)~ I

ACCESSION NBR:8108250280. DOC ~ DATE'. - 81/08/18 NOTARIZED: NO

FACIL»:50. 244 Robert Emmet Ginna Nuclear Plant< Unit li Rocheste| G

AUTHIBNAME AUTHOR AFFILIATIONMAIER'rJ ~

E' Rochester Gas L Electric CorpsRECIP ~ NAMKI RECIPIENT AFFIL»IATION

CRUTCHFIELD<,D, Operating„ Reactors Branch 5

SUBJECT: For wards responses to Questions 1 p2g3g5 L 6 of SEP T'opicVI~7 ~ B; re ESF swi tchover'g per 810227 1 tr .

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. ROCHESTER GAS AND ELECTRIC CORPORATION

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o 89 EAST AVENUE, ROCHESTER, N.Y. 14649

JOHN E. MAIERVICE PRESIDENT

TCLKPHONL'REA

CODE 7IO 546.2700

August 18, 1981

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Director of Nuclear Reactor RegulationMr. Dennis M. Crutchfield, ChiefOperating Reactors Branch No. 5Division of

Licensing'.S.

Nuclear Regulatory CommissionWashington, D.C. 20555

Subject: SEP Topic VI-7.B, "ESF Switchover"R. E. Ginna Nuclear Power PlantDocket No. 50-244

3

Dear Mr. Crutchfield:Attached is a response to your letter of February 27, 1981

regarding this SEP topic. Based on subsequent correspondencebetween Dennis M. Crutchfield and James A. Kay of Yankee AtomicElectric Company, dated June 4, 1981, it has been determined thatthe major NRC staff focus for this review concerns the instru-mentation and controls used to indicate Refueling Water StorageTank level and to terminate the injection phase of Emergency CoreCooling. The bases for this re-focus are provided in Section Vof this referenced letter.

Rochester Gas and Electric will thus respond only toquestions 1, 2, 3, 5, and 6 of the February 27, 1981 letter. Theinformation requested in question 4 can only be obtained via adetailed hydraulic set of calculations, which are not availableat this time. If required to complete this topic assessment, aschedule for this analysis can be provided. It appears, however,that the particular concerns of this SEP topic assessment areaddressed in our responses submitted in the attachment.

Very truly yours,

Attachment

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8108250280 810818tPDR ADOCK 05000244 »

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Attachment: Additional Information RequestedBy February 27, 1981 Letter Regarding

SEP Topic VI7.B, "ESF Switchover"

(1) Describe the procedures used to switchover from the injectionto the recirculation mode of emergency core cooling (ECC).

Response 1: Ginna Emergency Procedure E-1.2, "Loss of ReactorCoolant", describes the procedure used to switch over fromthe injection to the recirculation mode of emergency corecooling. A condensed description is presented here.

1) At the 31% low RWST level alarm LIA-921, stop onesafety injection (SI) and one containment spray (CS)pump, if more than one are running.

2) At 10% on LT-920 in the RWST, stop the operating safetyinjection, containment spray, and residual heat removalpumps.

3) Close the following valves:896A, RWST to SI Pumps896B, RWST to SI Pumps897, SI Pump Recirculation to RWST898, SI Pump Recirculation to RWST704A, RHR Pump 1A Suction Cross-Tie704B, RHR Pump 1B Suction Cross-Tie

4) Open the following valves:850A, RHR Pump 1A Suction from Sump B850B, RHR Pump 1B Suction from Sump B

5) Start 1A and 1B RHR Pumps

6) Check RHR flow on FI-626

This set of actions will initiate low head recirculation.If high head recirculation, or low head recirculation withspray is required, the following additional actions must beperformed:

~Hi h Head Recirculation

1) Check RC wide range pressure PR-420

2) Open valves MOV-857A, B, C — RHR to SI and CS pumpsuction

3) Start Safety Injection pumps 1A and 1B

4) Check SI flow in FI-924 and FI-925

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Low Head Recirculation wi~th S ra

1) Check spray additive (NaOH) tank level LT-931 andLIA-932

2) Check containment pressure PT-944-950

3) Open valves MOV 857A, B, C — RHR to SI and CS pumpsuctions

4) Start Containment Spray Pump(s) 1A and/or 1B

5) Check NaOH flow FI-930

6) Check RHR and CS flows FI-931A, 931B, 626

(2) For each instrument, indicator, logic device and alarm thatis used by the operator to perform a manual function or thatis used to initiate an automatic function in the switchoversequence; describe how that device is qualified and in-stalled (e.g. independence and separation of circuits) asClass 1E equipment.

Response 2: All indications required by the operator to per-form a safety-related function have redundant. or diversecomponents. The „instrument bus electrical one-line diagram,RG&E drawing 521489-269 showing power supply arrangements,is attached.

1) RWST level, LT-920, on instrument bus 1C (IB1C), isbacked up by level indicating alarm LIA-921 on theannunciator power transformer (normally fed from battery1A).

2)

3)

RHR flow FI-626, on IB1C is backed up by RC wide rangepressure PR-420 on IB1D. Instrument bus 1D, althoughfed from non-safeguards bus 15, is procedurally connectedto safeguards bus 16 if offsite power is lost prior tothe time that RWST-to-sump switchover would be required.SI flow FI-924, on IB1A and FI-925, on IB1B, are redundant

4) NaOH tank level LT-931, on IB1C is backed up by LIA-932on IB1B.

5) There are seven 'containment pressure indications PT-944to PT-950 on redundant power sources.

6) NaOH flow FT-930 on IB1C is backed up by tank levelLIA-932 on IB1B.

7) RHR flow to suction of CS and SI pumps FI-931A on IB1Cand FI-931B on IB1B are redundant.

0

All of the instrumentation which might experience an adversepost-accident. environm'ent has been included in the RGGEenvironmental qualification program, as stated in letterdated October 31, 1980 from John E. Maier to Darrell G.Eisenhut.

(3) Describe the level sensing system that is'sed to indicateor detect the level in the tank that supplies injectioncoolant. This description should include sensor and datacolumn location, freeze protection, freeze protection powersupply and those items specified in (2) above.

Response 3: Level transmitter LT-920 and level indicatingalarm LIA-921, whose sensors are located at the base of theRWST, provide the operator with redundant indication of RWSTlevel. Since at Ginna the RWST is located in the auxiliarybuilding, which is maintained above freezing temperatures,,no freeze protection is provided.

(5) Describe the paths of the minimum flow lines from each ECCS

pump discharge to the line end. This description shouldidentify all valves in these lines, the signals that controleach valve, the power sources for each valve, and the quali-fication of each valve.

Response 5: The flow paths for these pumps are shown on RGEEdrawings 33013-425, Safety Injection System, and 33013-436,Auxiliary Coolant System (attached).

The safety injection pumps each have a minimum flow linereturning to the RWST. The three lines join upstream of twoseries air-operated valves, AOV 897 and AOV 898. Thesevalves do not receive an actuation signal; however, they areinterlocked with motor-operated valves 857A, B, and C suchthat the discharge of the RHR pumps cannot be connected withthe suction of the SI pumps until AOV 897 and 898 are closed.The solenoid AOV 897 is powered from instrument bus 1B; AOV898 from instrument bus 1D. These valves fail-closed onloss of power or air.The Containment Spray pumps have a recirculation line fromthe discharge to the suction of the pumps, with manuallocked-open valves. The RHR pumps recirculate from thedischarge of the pumps through the RHR heat exchangers, andthrough a common line via recirculation orifice FE 628 tothe suction of the pumps. These are no valves in therecirculation path.

(6) For each minimum flow line that returns to a point otherthan the pump intake point, provide a single failure analysisand quantify the offsite dose rate, dose, and dose assumptionsobtaining from all single failures that do not isolate theselines during the recirculation phase at, ECC.

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Response 6: As noted in response 5 above, only the SI pumpsrecirculate back to the RWST. Redundant air-operated valves,which fail-closed, are interlocked with the 857A, B and Cvalves in the line leading from the discharge of the RHR tothe SI pumps. No single failure would thus prevent failureto close this minimum flow line.

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RWST Information

Total Volume = r338,000 gal.Normal = 300,000 gal.Tech Spec Min = 230,000 gal.Bottom of RWST: 236'2"Pump Inlet Nozzle: 237'8"

- -',lOS Level: 244'6"I31% Level: 262'0"Tank I.D. =

26.45'olume/Ft= 4;110 gal.Volume to Pump InletNozzle = 6,165 gal.

Volume to 10% Level '=34,250 gal.olume to 31% Level =106,175 gal.

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