ML17037C426

Request for Additional Information Regarding Technical Specification Changes to Allow Isolation of One Recirculation Loop During Operation

ML17037C426
Person / Time
Site:	Nine Mile Point
Issue date:	12/29/1977
From:	Lear G Office of Nuclear Reactor Regulation
To:	Dise D Niagara Mohawk Power Corp
References
Download: ML17037C426 (6)

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Docket NRC PDR DEC 2 9 1977 Local PDR ORB83 Rdg VStello Docket No. 50-220 KRGoller OELD OISE (3)

GLear tliagara fbhawk'ower Corporation SNowicki ATTN: I'ir. Donald P. Disc CParrish Vice President - Engineering DEisenhut 300 Erie Boulevard tfest TBAbernathy Syracuse, Hew York 13202 JRBuchanan ACRS (16)

Gentlemen: File We have completed a preliminary review of your April 14, 1977 request for Technical Specification changes for Nine file Point Unit Ho. 1 to allow isolation of one recirculation loop during operation. Me have concluded that we need additional information to complete our review.

Please provide responses to the request for information identified in the enclosure as soon as possible so that we may complete our review in a timely manner, If you have any questions, please contact us.,

Sincer el',

G orge Le, Chief Operating Reactors Branch N Division of Qperating Reactors

Enclosure:

Request for Additional Information cc: see next page OEI'ICE~ ORBP3 SURNAME~ Nowicki. r CATE~ 12/ /77 12/ g.g /77 NRC FORK 518 (9.76) NRI 0240 4 U2 S OOVERNMENT PRINTINO ORRICEI !OTS 025 024

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Niagara Mohawk Power Corporation cc: Eugene B. Thomas," Jr., Esquire LeBoeuf, Lamb, Leiby 8 MacRae 1757'N Street, N. H.

Washington, D. C. 20036 Anthony Z. Roisman, Esquire Sheldon, Harmon and Roisman 1025 15th Street, N. W.

5th Floor Washington, D. C. 20005 Oswego County Office Building 46 E. Bridge Street Oswego, New York 13126

RE VEST FOR ADDITIONAL INFORMATION CONCERNING IDLE LOOP ISOLATION NINE MILE POINT UNIT NO. l DOCKET NO. 50-220 The idle loop startup transient has been analyzed in your FSAR from an initial power of 90.5 percent. Is 90.5 percent power the most severe initial power for the idle loop startup transient analysis'? If not, revise the analyses using the most severe initial power level, or propose Technical Specification limitations restricting reactor power level to no more than 90.5 percent when in the four loop mode.

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