ML20204F260

Selected Operating Reactor Issues Program Ii:Rcs Vents, Final Technical Evaluation Rept

ML20204F260
Person / Time
Site:	Pilgrim
Issue date:	03/08/1983
From:	Held J ENERGY, INC., LAWRENCE LIVERMORE NATIONAL LABORATORY
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20204F250	List: ML20204F260
References
CON-FIN-A-0250, CON-FIN-A-250, RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.1, TASK-TM TAC-44395, TER-B-15, NUDOCS 8304290236
Download: ML20204F260 (4)

Text

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I a LAWRENCE LIVERMORE LABORATOf3,Y Selected Operating Reactor Issu?s Program II Reactor Coolant System Vents (NUREG-00737 Item II.B.1.) .

NRC FIN A0250 - Project 9 FINA'L TECH *3ICAL EVALUATION REPORT FOR PILGRIM 1 Docket Number 50-293 NRC TAC Number 44395 Prepared by J. T. Held of Energy Incorporated - Seattle (Subcontract 4324401) for Lawrence Livennore National Laboratory under contract to the NIC Office of Nuclear Reactor Regulation. Division of Licensing.

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NRC Lead Engineer - Gus Alberthal NOTICE "This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal 11ao111ty or responsibility for the accuracy, completeness or usefulness of any'information, apparatus, product or process disclosed, or represents that its use would not infringe privately-owned rights."

TF-360/0813a March 8, 1983 0304290236 830414 PDR ADOCK 05000293 P PDR Universityof Cat.tomia PO E'ox 808 Livermore Cahtornia 94550 0 Telsoncnel415)4471100 0 Tww 910 256 8339 UCLLL LVt!R

, Dockst Number 50-293 -

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NRC TAC Wmber 44395 TECl+4 CAL EVALUATION REPORT ON REACTOR COOLANT SYSTEM VENTS , ,  ;

FOR PILCRIM i .

INTRODUCTION The requirements for reoctor coolant system high point vents are stated in porograph

(cX3Xiii) of 10 CFR S0.44, " Standards for Combustible Gas Control System in Light  !

Woier Cooled Power Reactors,"and are further dewribed in Standard Review Pion (SRP)

Section S.4.12, " Reactor Coolant System High Pbint Vents," and item II.B.I of

, NUREG 0737,'Clorificot!on of TMI Action Plan Requirements." In response to these and previous requirements, the Boston Edison . Company has submitted information in References I through 3 in support of the vent system at Unit I of the Pilgrim Nuclear Power Statfori.

- EVALUATION .

The function of the reactor coolant system (RCS) vent system is to vent nonconderisible gases from the high points of, the RCS to assure that core cooling during natural circulation will not be inhibited. The Boiling Water Reactor (BWR) Owners' Group has submitted documentation (References 4 through 7) on how the RCS venting requirements are met in General Electrie (GE) BWRs. The BWR Owners' Group position has been endorsed by the licensee.

In accordance with the BWR Owners' Group position, the primary. means of venting noncondensible gases from the reactor pressure vessel at Pilgrim I are four power-operated,'sofety-grade automatic depressurization system (ADS) safety / relief volves i which alone provide adequate vent!ng.

4 We have reviewed design information on the volves associated with the' obove system j that will serve os RCS vents and confirmed that they are operable from the main control i room. We have also determined that the volves are provided with emergency power and i that a degree of redundancy in the RCS vent system ~is provided by powering different i

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l vent paths from different emergency buses. NRC has previously verified that the j safety / relief volves are provided with positive position Indication in the main control l i

I room (Reference 8). Additional RCS venting occurs at the high pressure coolant injection (HCPI) ond reocfor core isolation cooling (RCIC) system turbine exhausts. ,Also, 1

, based on the similarity of the Pilgrim 1 design to other General Electric BWRs, we find

{ that no protection system that i necessory to maintain odequate core cooling requires i remote venting 'since none are susceptible to the buildup of o large amount of i

i noncondensible gas that could cause o loss of function of these systems.

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1 CONCLUSION I r i

j We conclude, based on the eplicobility of the BWR Owners' Group position to Pilgrim i j ond our specific review of the Pilgrim i design lthat the existing systems at Pilgrim I are i sufficient to effectively vent noncendensible gases from the RCS and . meet the requirements of NUREG-0737 Item 11.B.1 and paragraph (cX3Xiii) of 10 CFR 50.44. We j therefore recommend that the Pilgrim l RCS venting capability be found acceptable by l NRC. It should be noted,' however, that the following items were excluded from the j scope of our review: seismic and environmental quali.fication, operating guidelines ed

, procedJres, and required rWificctions to the plant tecFnical 'specificottons and j in-service inspection program for use of existing systems o's RCS vents.

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REFERENCES I

1. Letter, G.C. Andognini (Boston Edison Company) to D.G. Eisenhut (NRC), " Fellow-Up to Reviews Regarding the Three Mile Island Unit 2 Accident," dated October 19, 1979.

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2. Letter,: A.V. Morisi (Boston Edison Compmy) to D.G. Eisenhut (NRC), with response to NUREG-0737 Item II.B.I, Reactor Coolont System Vents, dated August.20,1981.

3. Letter,. A.V. Morisi (Boston Edison Corromy) to D.B. Vossollo (NRC), "Information on NUREG 0737 Items 11.B.1 and ll.K.3.30," dated June 3,1982. .

4. Letter, T.D. Keenan (BWR Owners' Group) to D.G. Eisenhut (NRC), "BWR Owners' Group Positions on NUREG-0578," dated October 17,1979.

5. Letter, D.B. Waters (BWR Owners' Group) . to NRC (Attn: D.G. Elsenhut),

. " Preliminary Ciorification of TMI Action Plan Requirements - BWR Owners' Group i -. Comrnents," dated October 8,1980.

6. General Electric Report NEDO-24708A, Revision I, "Additionoi information Required for NRC Staff . Generic Report on Boiling Water Recetors," dated December 1980. l

7. Letter, D.B. Waters (BWR Owners' Group) to NRC (Attn: D.G. Eisenhut),  ;

I "NUREG-0660/0737 Requirement II.B.l: Reactor Coolant System Vents," dated April 24,1981.

8. ' UREG-0737, "Clorification of.TMI Action Plan Requirements," Item II.D.3, " Direct N

Indication of Relief- ond Sofety-Volve Position," dated November 1980. l l

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