ML20056G125

Requests Addl Info on Plant Re Implementation of Safer/ GESTR-LOCA Methodology to Complete Evaluation of Amend Request

ML20056G125
Person / Time
Site:	Nine Mile Point
Issue date:	08/17/1993
From:	Menning J Office of Nuclear Reactor Regulation
To:	Sylvia B NIAGARA MOHAWK POWER CORP.
References
TAC-M86066, NUDOCS 9309020094
Download: ML20056G125 (4)

Text

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555

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August 17, 1993 Docket No. 50-410 Mr. B. Ralph Sylvia Executive Vice President, Nuclear Niagara Mohawk P uer Corporation 301 Plainfield Road Syracuse, New York 13212

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON NINE MILE POINT NUCLEAR STATION, UNIT 2 - IMPLEMENTATION OF SAFER /GESTR-LOCA METHODOLOGY (TAC NO. M86066)

By letter dated March 22, 1993, Niagara Mohawk Power Corporation (NMPC) submitted an amendment request that would revise the Nine Mile Point Nuclear Station, Unit 2 (NMP-2), Technical Specifications to permit use of the SAFER /GESTR-LOCA methodology for accident analyses. The NRC staff subsequently determined that additional information was needed to complete evaluation of the amendment request and issued a request for additional information (RAI) on June 16, 1993. NMPC responded to the RAI on July 14, 1993, and the response forwarded a copy of Revision 1 of General Electric Proprietary Topical Report NEDC-31830P, "Nine Mile Point Nuclear Power Station, Unit 2 SAFER /GESTR-LOCA, Loss-of-Coolant Accident Analysis." The staff has reviewed NMPC's response dated July 14, 1993, and determined that additional information is needed to complete our evaluation.

Specifically, approval of the SAFER /GESTR methodology was based on certain conditions, including confirmation that the plant-specific peak cladding temperature (PCT) calculations match the trend of the generic PCT versus break size curves. This is necessary to assure that the SAFER /GESTR model is applied in a manner that maintains the validity of the statistical model for plant specific applications. The calculations for NMP-2 show a small-break PCT nearly equal to the large-break PCT. This represents a significant departure from the SAFER /GESTR assumptions for this class of plants.

Accordingly, we request that NMPC provide additional or revised information showingthelicensingbasisPCTvalueaswellpstheupperboundPCT evaluation at the limiting small break (0.1 ft ).

The staff requires this information to confirm that the large break is indeed the limiting event across the break spectrum, and that the SAFER /GESTR methodology is being applied in an appropriate manner.

In order to facilitate timely resolution of this matter, we request that NMPC provide a written response within 30 days of receipt of this letter.

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Mr. B. Ralph Sylvia August 17, 1993

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i This requirement affects one respondent and, therefore, is not subject to i

Office of Management and Budget review under P.L.96-511.

Sincerely, E.

i John E. Menning, Project Manager Project Directorate I-1 i

Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation I

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F Mr. B. Ralph Sylvia Nine Mile Point Nuclear Station Niagara Mohawk Power Corporation Unit 2 cc:

Mark J. Wetterhthn, Esquire Regional Administrator, Region 1 Winston & Strawn U. S. Nuclear Regulatory Commission 1400 L Street, NW.

475 Allendale Road Washington, DC 20005-3502 King of Prussia, PA 19406 Mr. Richard Goldsmith Charles Donaldson, Esquire Syracuse University Assistant Attorney General College of Law New York Department of Law E. 1. White Hall Campus 120 Broadway Syracuse, New York 12223 New York, New York 10271 Resident Inspector Mr. Richard M. Kessel Nine Mile Point Nuclear Station Chair and Executive Director P. O. Box 126 State Consumer Protection Board Lycoming, New York 13093 99 Washington Avenue Albany, New York 12210 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation Mr. John H. Hueller 300 Erie Boulevard West Plant Manager, Unit 2 Syracuse, New York 13202 Nine Mile Point Nuclear Station i

Niagara Mohawk Power Corporation Mr. David K. Greene P. O. Box 32 Manager Licensing Lycoming, New York 13093 Niagara Mohawk Power Corporation 301 Plainfield Road Vice President - Nuclear Generation Syracuse, New York 13212 Nine Mile Point Nuclear Station Niagara Mohawk Power Corporation Ms. Donna Ross P. O. Box 32 New York State Energy Office Lycoming, New York 13093 2 Empire State Plaza 16th Floor Albany, New York 12223 Supervisor Tow 1 of Scriba Route 8, Box 382 Oswego, New York 13126

i Mr. B. Ralph Sylvia August 17, 1993 l

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This requirement affects one respondent and, therefore, is not subject to l

Office of Management and Budget review under P.L.96-511.

Sincerely, Original signed by:

i John E. Menning, Project Manager 3

Project Directorate I-l Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc:

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