ML20078Q893

Transmits Application for Amend to License NPF-69 Re Changes to Table 3.6.1.2-1,entitled Allowable Leak Rates Through Valves in Potential Bypass Leakage Path

ML20078Q893
Person / Time
Site:	Nine Mile Point
Issue date:	12/13/1994
From:	Sylvia B NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20078Q898	List: ML20078Q893 ML20078Q915 ML20078Q924
References
NMP2L-1515, NUDOCS 9412230117
Download: ML20078Q893 (2)

Text

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, M Y NI RA RU AWK phAGARA MOHAWK POWER CORPORAnON/NINE MILE POINT, PO. BOX 63, LYcOMING, NY 13093/ TELEPHONE (315) 349-2882 B. Ralph Sylvia -

Executive Vice President Nuclew December 13, 1994  ;

NMP2L 1515 9

U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 RE: Nine Mile Point Unit 2 Docket No. 50-410 i NPF-69 Gentlemen:

Niagara Mohawk Power Corporation (NMPC) hereby transmits an Application for  ;

Amendment to Nine Mile Point Unit 2 (NMP2) Operating License NPF-69. _ Also enclosed as Attachment A are the proposed changes to the Technical Specifications. Supporting information and an analysis, demonstrating that the proposed changes involve no significant hazards consideration pursuant to 10 CFR 50.92, are included as Attachment B.

The proposed Technical Specifications contained herein represent changes to Table 3.6.1.2-1, entitled " Allowable leak Rates Through Valves in Potential Bypass leakage Paths." ,

Specifically, the changes to this table would allow a maximum leakage of 24.0 scfh for each  !

of the eight main steam isolation valves (MSIVs). Currently, the maximum allowable leakage for each of the MSIVs is 6.0 scfh.

The proposed increase in MSIV leakage is supported by a radiological analysis which demonstrates that for a design basis - loss of coolant accident (DBA-LOCA), the radiological doses remain below 10 CFR 100 guideline values and General Design Criteria (GDC) 19 requirements. This change provides a more realistic, but still conservative, limit for MSIV leakage.

The proposed increase in the maximum allowable MSIV leakage rate will eliminate MSIV refurbishment for leakage test results up to 24.0 scfh. This change will reduce MSIV maintenance cost, radiological dose to Maintenance personnel and the potential for outage extensions _without affecting the public health and safety. The typical exposure received j while refurbishing an MSIV after failure of a local leak rate test is approximately 2.5  !

manrem. Similarly, the cost is approximately $250,000 for refurbishing an MSIV.

NMPC is requesting this license amendment be issued by April 12,1995, to permit realization of the above savings in radiation exposure and cost for refurbishment of an MSIV during the upcoming fourth refueling outage. I.ocal leak rate testing of MSIVs is scheduled to start on April 13, 1995. A copy of the license amendment request and the associated analysis which demonstrates that no significant hazards consideration exists have been provided to the appropriate state representative in accordance with 10 CFR 50.91(b)(1).

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• i Very truly yours,

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8. Ral S via Executive Vice President - Nuclear BRS/KWK/Imc Attachments xc: Regional Administrator, Region I Mr. B. S. Norris, Senior Resident Inspector Mr. L. B. Marsh, Director, Project Direct] rate I-1, NRR Mr. D. S. Brinkman, Senior Project Manager, NRR Ms. Donna Ross Division of Policy Analysis and Planning New York State Energy Office Agency Building 2 Empire State Plaza Albany, NY 12223 Records Management