ML20062B299

Operating Reactor - TMI Lessons Learned NUREG-0737 Response Evaluations (Program Ii),Project 1 - RCS Vents (Item II.B.1), Final Technical Evaluation Rept for Hatch 1 & 2

ML20062B299
Person / Time
Site:	Hatch
Issue date:	06/07/1982
From:	Barnhart B, Butcher E LAWRENCE LIVERMORE NATIONAL LABORATORY
To:	NRC
Shared Package
ML20062B289	List: ML20062B299
References
CON-FIN-A-0246-2, CON-FIN-A-246-2, RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.1, TASK-TM NUDOCS 8208040442
Download: ML20062B299 (4)

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LAWRENCE LIVERMORE l_ABORATORY p wJ<A K

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Operating Reactor - TMI Lessons Learned NUREG-0737 Response Evaluations (Program II)

Project 1 - Reactor Coolant System Vents (Item II.B.1)

NRC FIN A0246-2 FINAL TECHNICAL EVALUATION REPORT FOR HATCH 1 and 2 Prepared by Energy Incorporated - Seattle for Lawrence Livermore National 1.aboratory under contract to the NRC Office of Nuclear Reactor I,egulation, Division of Licensing.

DL Cognizant Manager - Ed Butcher DL Project Manager - Beverly Barnhart NOTICE 3 "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 liabibty or respon.

sibility 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."

June 7, 1982 8208040442 820722 PDR ADOCK 05000321 P PDR

. .~us. u . va.re., vivo,v v :,ts.yv wnn r'O Box BJS Lr.vmare.Ca'xna.M550 Telc;wn:MB)422-1100 Txx 910-386 8339 UCLLL LVMR

Docket Numbers 50-321 and 50-366

'NRC TAC Numbers 42155 and 42156 ,

TECHNICAL EVALUATION REPORT ON REACTOR COOLANT SYSTEM VENTS FOR HATCH I AND 2 INTRODUCTION The requirements for Reactor Coolcat System High Point Vents are stated in paragraph (CX3)(iii) of 10 CFR 50.44, " Standards for Combustible Gas Control System in Light Water Cooled Power Reo.ctors," and are further described in item 11.B.1 of NUREG-0737,

" Clarification of TMI Action Plan Requirements." in response to these and previous requirements, the Georgio Power Company has submitted information in References I and 2 in support of the vent system on Edwin I. Hatch Nuclear Plant Units I and 2.

EVALUATION The function of the reactor coolont system (RCS) vent system is to vent noncondensible 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 3 through 6) on how the RCS venting requirements are met in General Electric (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 Hatch I and '2 ore six power-operated, safety-grade automatic depressurization system (ADS) safety / relief volves which alone provide adequate venting.

We have reviewed design information on the volves ossociated with the above system that will serve os RCS vents and confirmed that they are operable from the main control l

room. We have also determined that the valves are provided with emergency power and that a degree of redundancy in the RCS vent system is provided by powering different l vent paths from different emergency buses. NRC has previously verified that the safety / relief volves are provided with positive position indication in the main control

room (Reference 7). Additional RCS venting occurs at the high pressure coolont injection (HPCI) and reactor core isolation cooling (RCIC) system turbine exhausts. The licensee has also verified that no protection system that is necessary to maintain adequate core cooling requires remote venting since none are susceptible to the buildup of a large amount of noncondensible gas that could cause o loss of function of these systems.

CONCLUSION We conclude, based on the applicability of the BWR Owners' Group position to Hatch I and 2 and our specific review of the Hatch I and 2 design, that the existing systems at Hatch I and 2 ore sufficient to effectively vent noncondensible gases from the RCS and meet the requirements of NUREG-0737 Item 11.B.1 and paragraph (c)(3)(iii) of 10 CFR 50.44. We therefore recommend that the Hatch I and 2 RCS venting capability be found acceptable by NRC contingent on confirmation that on inerted containment atmosphere has been provided for Hatch Unit 2, in accordance with paragraph (c)(3)(i) of 10 CFR 50.44, and the NRC review and approval of the existing operating procedures and technical specifications for use of the existing systems os RCS vents.

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REFERENCES

1. Letter, J.T. Beckham, Jr. (Georgio Power Company) to Director of Nuclear Reactor Regulation (NRC), " Supplemental Submittal on NUREG-0737 Items," dated July 1,1981.

2. Letter, J.T. Beckham, Jr. (Geo'rgio Power Company) to Director Nuclear Reactor l

Regulation (NRC), " Response to Request for Additional Information, Reactor Coolant System Vents NUREG-0737 Item II.B.1," dated April 27,1982.

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

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

" Preliminary Clarification of TMI Action Plan Requirements - BWR Owners' Group Comments," dated October 8,1980.

5. General Electric Report NEDO-24708A, Revision I," Additional Information Required for NRC Staff Generic Report on Boiling Water Reactors," dated December 1980.

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

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

7. NUREG-0737, " Clarification of TMI Action Plan Requirements," item II.D.3, " Direct Indication of Relief- and Safety- Valve Position," dated November 1980.

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