ML17037C477

Letter Enclosing Supplement No. 1 to the Safety Evaluation Report for the Application for a Full-Term Operating License

ML17037C477
Person / Time
Site:	Nine Mile Point
Issue date:	11/15/1974
From:	Lear G US Atomic Energy Commission (AEC)
To:	Raymond P D Niagara Mohawk Power Corp
References
Download: ML17037C477 (22)

Text

Docket No.50-220 Gentlemen:

full-tenn operating license for Unit 1 of your Nine Mile Point priginal Signed November 15, 1974 DISTRIBUTION:

AEC PDR DMuller Local PDR KRGoller Docket TJCarter ORBi/3 Rdg OIS (5 copies)HJMcAlduff RBrodsky.Niagara Mohawk Power Corporation SHanauer CStephens (2 copies)ATTN: Mr., Philip D.Raymond AGiambusso CJDeBevec Vice President-Engineering FSchroeder SATeets 300 Erie Boulevard Hest RBoyd (4 copies)NDube Syracuse, New York 13202 DKnuth (2 copies)'Jones (2 cps)RMaccary (2 copies)CLong RTedesco (2 copies)RVollmer HDenton (2 copies)RSchemel The Directorate of Licensing has issued the enclosed Supplement VBenaroya BGrimes No.1 to the Safety Evaluation Report on your application for a GLainas SPawlicki TIppolito JKastner Nuclear Station.SVarga JOsloond Sincerely, RO (8)TEnglehardt George Lear, Chief Operating Reactors Branch 83 Directorate of Licensing

Enclosure:

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4 V, S, OOVNRHMNNT PlllNTINO OPPICNI 1S74 SRS lSS I L f 1 cdl4)<<41'I f ,f Niagara:fohawk Power Corporation November 15, 1974 cc: w/enclosure Hr.Arvin E.Upton, Esquire Le3oeuf, Lamb, Leiby 6 tfacRae 1757 N Street, N.U.Washington, D.C.20036 Hr.Robert P.Jones, Supervisor Town of Scriba R.D.04 Oswego, New York 13126 Hiss Juanita I ersey, Librarian Oswego City Library 120 E.Second Street Ommgo, New York 13126 Dr.Vill%am E.Seymour Staff Coordinator New York State Atomic Energy Council New York State Department of Commerce 99 Tfashington Street Albany, New York 12210 OPRICE5H'VRHAMC~

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SUPPLEMENT NO.1 TO THE SAFETY EVALUATION REPORT BY THE DIRECTORATE OF LICENSING U.S.ATOMIC ENERGY CO~QHSSION IN THE MATTER OF NIAGARA MOMtK POWER CORPORATION CONVERSION FROM PROVISIONAL OPERATING LICENSE TO FULL-TERM OPERATING LICENSE NINE MILE POINT UNIT 1 DOCKET NO.50-220 NOVEMBER 151974

TABLE OF CONTENTS l.0 INTRODUCTION

2.0 REPORT

OF ADVISORY COMMITTEE ON REACTOR SAFEGUARDS (ACRS)2.,1 Main Steam Line Isolation Valve Leakage 2.2 Reactor Pressure Vessel In-Service Inspection

2.3 Possible

Additional Backfit Improvements

3.0 QUALITY

ASSURANCE PROGRAM 4cO CONCLUSIONS APPENDICES'PPENDIX A Report of ACRS

1.0 INTRODUCTION

The AEC Regulatory staff's Safety Evaluation Report (SER), in the matter of the Niagara Mohawk Power Corporation (herein'I referred to as NMPC or the licensee)application for conversion of Provisional Operating License No.DPR-17 to a full-term I operating license for Nine Mile Point Unit 1 (NMP-1)was issued on July 3, 1974.Copies of this report were made available to the Advisory Committee on Reactor Safeguards (ACRS or Committee) to assist it in its review of this application.

The Committee 2.0 completed its review of the licensee's application in September 1974 and reported its findings to the Commission by letter dated.September 10, 1974.REPORT OF THE ADVISORY COMMITTEE ON REACTOR SAFEGUARDS A copy of the ACRS report to.the Commission is included's Appendix A.Me have considered the comments and recommendations made by the ACRS in this report and the actions which we have taken or will'take relative to these comments and recommendations are described in the following paragraphs.

The Committee identified three matters for further surveillance:

these matters consist of maintaining leak tightness of main steam line isolation valves;'possible improvements in accessibility for in-service inspection of the reactor pressure vessel to assure continued vessel integrity; and consideration to the possible advisability of additional backfitting where significant and practical safety improvements can be trade.The Committee concluded that there

F exists reasonable assurance that the Nine Mile Point Nuclear Station Unit 1 can continue to be operated at power level's.up to 1850 1%it without undue risk to the health and safety of the 2.1 public.Moreover, the Committee concurred in conversion, of the present provisional operating license to a full-term operating license.Main Steam Line Isolation Valve Leaka e The Committee indicated its awareness of the difficulty that has been experienced at EP-1 in maintaining the required leak tightness of the main steam line isolation valves (MSLIV)and stated that the Regulatory staff should continue to follow this matter closely.The licensee stated its belief that leakage through these valves will be maintained at acceptable rates below the Technical Specification limits as a result of changes in maintenance procedures involving the valve seats and plugs, initiated during the 1974 refueling shutdown.The next leakage rate test of the ll'SLIVs'will be performed during the 1975 refueling shutdown.The Regulatory staff will follow this mat'ter to confirm'that the problem, is corrected.

l 2.2 Reactor Pressure Vessel In-Service Ins ection The Committee expressed its belief that additional means for assuring continued vessel integrity, including possible improvement in accessibility for inspection, should continue to be actively studied and implemented to the degree practical.

The licensee has stated its'interest to continue to seek possible improvements in the matter of vessel acchssibility and to implement such

improvements to the degree practical.

Our on-going review oi the operating facility will monitor progress in this area..2.3 Possibl6 Additional Backfit Im rovements'The Committee recommended that the Regulatory staff and the licensee'ive further consideration to additional backfitting where significant and practical safety improvements can be made.The licensee has indicated that it has a continuing program'of review to determine the conCormance of RP-1 with new Regulat:ory Guides as these are issu'ed.'he Regulatory staff will continue its on-going review of~~RP-l, including consideration of backfitting where significant

,.3.0 and,practical safety improvements can be made.UALITY ASSURANCE (A)PROGKQf As stated in our SER, we have reviewed the licensee's QA Program and concluded that it is acceptable.

The licensee's QA Program was described in four different submittals.

This information.was superseded by the licensee's submittal of August 28,'974, entitled,"Tenth Supplement to the Final Safety Analysis Report" which ,consolidates and unifies the earlier submittals.

We have reviewed and determined that the Tenth Supplement to the FSAR is 4:0 the same as the QA Program which we had previously reviewed and found acceptable.

C CONCLUSIONS Our conclusions as stated in the Safety Evaluation Report remain unchanged..

C APPENDIX A n n f7'>fl P3 D1 September 10, 1974~Honorable Dixy Lee Ray Chairman U.S.Atomic Energy Commission Mashington, D.C.20545 ADYlSORY COMMlTTEE ON REACTOR SAFEGUARDS UNlTED STATES ATOMlC ENERGY COMMlSSlON VifASHlMkTOH, D.C:.10545 a pJ 0 fj I jul CD

Subject:

REPORT ON NINE MILE.POINT NUCLEAR STATION UN'

Dear Dr.Ray:

At its 173rd meeting, September 5-7, 1.974, the Advisory Committee'on Reactor Safeguazds complete a rev ew o d i f the application by the Niagara Mohawk Power Corporation for conversion o s f its Nine Mile Point Nuclear Station Vnit 1~1~provisiona opera 1ng c 1 tin license to a full-tean ooerating l.icense.The app 1-cation also was considered at a Subcommittee meeting in as ng on, July 29, 1974.During ltd review, the Committee had the benefit of discus-sions with representat ves o i f the Niagara Mohawk Power Corporation, General d the Electric Company, an t e d he AEC Regulatory Staff.The Committee also ha t e benefit oE the documents l.isted.The Committee previous y iscusse project in an operating license report of p*f A ri 1 17 1969 and in subsequent xeports dated June 16, 1970 and Februazy 6, 1971.In its zev1ewp t e omm h C ittee evaluated the operation and performance of h't ith'rticular emphasis on the response of the app 1can o past recommendations for improvements in safety relate sys ems.Un t s anon-e U i 1 i on-jet pump boiling water.reactor of 1850~M(t)rated power leve.ommexc1a 1 C 1 power operation of-the plant was begun 1n However The operating is ory o h'of the unit has been generally satisfactory.

ountezed o o eratin roblems or design deficiencies have been encoun a number of operat ng pro during the approximately five year pexiod o=power opera ion.rackin of a coxe spray nozzle safe end;development o crac s these are: crac 1ng o a c lu ishness.'failure of: th steam dryer assembly;contxol.rod scram s ugg1s i.xn e s ntzol rods to remain fully inserted aEter scram, increased control.some con zo r to assure rotection for a pos-xod'operating restrictions found necessary to assure p 1 d d dro accident.feedwatex contxol deficiency, with resultant b xelief valve steam floodin of steam lines;torus baffle dislocation y xe oo 1ngo s failure of a relief valve to reclose, All discharge into the torus;and, fai ure o ril corrected.

Reactor of these deficiencies appear to have been satisfactorily coxrecte.a availability has averaged approximately 667..

~e Honorable Dixy Lee Ray.C r'0 September 10, 1974 Difficulty also has been experienced in respect to repeated occurrences of excessive'leakage rates of the main steam isolation valves under'test con-ditions.The applicant now proposes to remachine the valve seats and plugs to an improved configuration and believes that this, together with the probable low levels of residual stressesnow existing in these valves, wi'll enable maintenance of acceptable leakage rates"in the future'.-This matter should be followed closely by the Regulatory Staff.a A number of design improvements have been accomplished or comnitted to since operation began.Among the most significant of these from the point of view of safety are the following.

The feedwoter" system has been modified also to serve as an additional emergency core cooling system for small breaks;emergency power for this system is supplied by an offsite source of hydro-electric power.'fuel cask drop protection system has been designed and approved, and installation will be completed before shipment of spent fuel is undertaken.

A containment atmosphere dilution (CAD)system for combustible gas control will be installed and available for operation in 1976.An ad-ditional primary pressure boundary leak detection system has been added, and position'indication in the control room for the contaitunent vacuum breaker valves has been provided.Approximately one-fifth of the reactor 7x7 fuel bundles have been replaced with 8x8 fuel;through additional reloads, the core eventually is to consist entirely of,8x8 fuel.Because of the relatively limited accessibility for in-service inspection of the reactor pressure vessel, the Committee wishes to emphasize again its belief that additional means for assuring continued vessel integrity, in-cluding possible improvement in accessibility, should continue,to be actively studied'and implemented to the degree practical.

The Committee recotrrnends that the Regulatory Staff and the applicant give turther consideration to the possible advisability of additional backfitting of Unit 1 where s'ignificant and practical safety improvements can bc made.The Committee believes that, in view of the generally satisfactory operating experience to date and the'improvements'made in the plant'as noted herein, and subject to the above comments and-those in previous ACRS reports on this plant, there exists reasonable assurance that the Nine Mile Point"'-Nuclear Station Unit 1, can continue to be operated at power levels up to 1850 MM('t)without undue risk to the health and safety of'he public.The Committee concurs in conversion of the present provisional operating license to a full-term operating license.Sincerely yours, M.R.Stratton Choirman

References:

Sec Page 3

~+)'~~Honorable Dixy Lee Ray e&3%0 September 10.'974 References!

1.Niagara Mohawk Power Company Technical Supplement to Petition for Conversion from Provisional Operating, License to Full-Term Operating License dated July 1972.2.Applicant'nvironmental Report, Operating License Stage, Conversion to Full-Term Operating License, June 1972.3.Amendments 1 through 3 to Application for Full-Term Operating License.4.Directorate'f Licensing Safety Evaluation Report dated July.3, 1974.5~Directorate of'icensing letter dated July 3, 1974 concerning list of outstanding items in connection with their review of application for Full-Term Operating License.6.Niagara Mohawk Power Corporation letter dated November 20, 1972 con-cerning Fuel Densification and its Effect on Reactor Operation Including Transients and Postulated Loss-of-Coolant Accident.

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