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

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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 >

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FOR ACTION: BR CHIEF ORB 53 CHIEF44LTR ONLY (Q)

INTERNAL: REG FII 'LTR ONLY< 1) NRC PDR44LTR ONLY<i)

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CASE~~+LTR ONLY(i) DIRECTOR DPM4LTR ONLY(i)

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STRUCTURAL ENG BR4t<LTR ONLY< 1) GUIBERT+4LTR ONLY(i)

PLANT SYSTEMS BR++LTR ONLY(2> AD FOR OPER TECH>~LTR ONLY(2)

AD FOR PLANT SYSTEMS44LTR ONLY< CONTAINMENT SYSTEMS+4LTR ONLY< 1 ENGINEERING BR~+LTR ONLY(i > AD FOR ENG++LTR ONLY(i>

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DISTRIBUTION: LTR 44 ENCL 0 CONTROL NBR: 78156 073 SIZE: 1P 4%0H+4 %%%%%%4M 5%4%%%%%%%% 4%%0Hrfr+%%+ THE END 4 %4 4%NN%4+ H.wr:

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NIAGARA MOHAWK POWER CORPORATION NIAGARA '~

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MOHAWK 300 ERIE BOULEVARD. WEST SYRACUSE, N. Y. I 3202 May 26, 1978 1

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Director of Nuclear Reactor Regulation Attn: Mr. V. Stello, Jr., Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C. 20555 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

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