ML17037B588

Letter Regarding a Request for Evaluation of the Effect on Unit 1 Containment of Multiple Subsequent Actuations of Safety/Relief Valves Following a Postulated Isolation Event

ML17037B588
Person / Time
Site:	Nine Mile Point
Issue date:	05/26/1978
From:	Dise D Niagara Mohawk Power Corp
To:	Stello V Office of Nuclear Reactor Regulation
References
Download: ML17037B588 (4)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM<RIDS)DISTRIBUTION FOR INCOMING MATERIAL~~XO-.O.~.REC: STELLO V ORG: DISE D P DOCDATE: 05/26/78 NRC NIAGARA MOHAWK PWR DATE RCVD: 06/05/78 DOCTYPE: LETTER NOTARIZED:

NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 0 RESPONSE TO NRC REQUEST OF 03/20/78...

ADVISING EVALUATION OF THE EFFECT ON SUBJECT FACILITY"S CONTAINMENT OF MULTIPLE SUBSEQUENT ACTUATIONS OF SAFETY/RELIEF VALVES FOI LOWING A POSTULATED ISOLATION EVI=NT WILL BE SUBMITTED ON OR BEFORE 07f31/78.r PLANT NAME: NINE MILF F'T-UNIT REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL: DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS++++++++>>+>++>>++

MARK I CONTAINMENT (RELATED INFO ON INDIVIDUAL DOCKETS><DISTRIBUTION CODE A025)FOR ACTION: INTERNAL: EXTERNAL: REG FII'LTR ONLY<1)U~~LTR ONLY(i>CASE~~+LTR ONLY(i)DEPUTY DIR DPM++LTR ONLY(1>STRUCTURAL ENG BR4t<LTR ONLY<1)PLANT SYSTEMS BR++LTR ONLY(2>AD FOR PLANT SYSTEMS44LTR ONLY<ENGINEERING BR~+LTR ONLY(i>LPDR S OSWEGO NY++LTR ONLY(i)TIC+4LTR ONLY(1)NSIC~~LTR,.

ONLY<1)ACRS CAT"B~4.LTR ONLY (16>NRC PDR44LTR ONLY<i)GOSSICK 8.STAFF+>LTR ONLY(1>DIRECTOR DPM4LTR ONLY(i)I 8c E+%LTR ONLY(2)GUIBERT+4LTR ONLY(i)AD FOR OPER TECH>~LTR ONLY(2)CONTAINMENT SYSTEMS+4LTR ONLY<1 AD FOR ENG++LTR ONLY(i>BR CHIEF ORB 53 CHIEF44LTR ONLY (Q)DISTRIBUTION:

LTR 44 ENCL 0 SIZE: 1P CONTROL NBR: 78156 073 4%0H+4%%%%%%4M 5%4%%%%%%%%

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l rl NIAGARA MOHAWK POWER CORPORATION

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WEST SYRACUSE, N.Y.I 3202 May 26, 1978 Director of Nuclear Reactor Regulation Attn: Mr.V.Stello, Jr., Director Division of Operating Reactors U.S.Nuclear Regulatory Commission Washington, D.C.20555 1 0 I Gentlemen:

Re: Nine Mile Point Unit 1 Docket No.50-220 DPR-63 Your letter of March 20, 1978 requested an evaluation of the effect on the Nine Mile Point Unit 1 containment of multiple subsequent actuations of safety/relief valves following a postulated isolation event.Your letter also transmitted criteria for this evaluation.

This evaluation is part of the Mark I Containment Long Term, Program;therefoxe a common approach will be taken.Due to the generic issues involved, we are unable to submit a response in the time frame requested.

However, an evaluation for Nine Mile Point Unit 1 will be submitted on or before July 31, 1978.Very truly yours,.;~PPPD" NIAGARA MOHAWK POWER CORPORATION Donald P.Disc Vice President-Engineering MGM/szd 78156007,3 1 I 1)