ML20133H714

Informs That Proposed Amend Re Ice Bed Weight Based Upon Rev to Design Basis Containment Pressure Calculation in FSAR Section 6.2.1 & Involves Significant Hazards Consideration. Encl Notice of Opportunity for Prior Hearing Issued

ML20133H714
Person / Time
Site:	McGuire, Mcguire
Issue date:	07/31/1985
From:	Novak T Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
Shared Package
ML20133H716	List: ML20133H714 ML20133H729
References
TAC-57335, TAC-57336, NUDOCS 8508090472
Download: ML20133H714 (2)

Text

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g UNITED STATES NUCLEAR REGULATORY COMMISSION

% O l WASHINGTON, D, C. 20555 July 31, 1985 Docket < Nos :'50-369 "

e and s50-370u n Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

Subject:

Revised Containment Pressure Calculation for Technical Specification 3.6.5.1 (McGuire Nuclear Station, Units 1 and 2)

Your letter dated April 5,1985, contained a proposed amendment to the Technical Specifications for the McGuire Nuclear Station that would incorporate the results of a Westinghouse reanalysis of the Containment Pressure Calculation into Tech-nical Specification 3.6.5.1. In support of your request and in conformance with the requirements of 10 CFR 50.91, you provided the results of your analysis of significant hazards consideration.

Based on our evaluation of your significant hazards consideration, we do not agree that the proposed amendment would not create the possibility of a new or different type of accident from any accident previously evaluated. Indeed, the proposed amendment is based upon a revision to the design basis containment pres-sure calculation in McGuire FSAR Section 6.2.1 using a slightly reduced minimum ice bed weight (from 2,466,420 to 2,355,320 lbs) and an earlier diversion of partial Residual Heat Removal System flow to the containment spray pumps (from 3590 to 3000 seconds after the LOCA). The use of a different ice bed weight and flow diversion time could introduce a sequence of events for the accident scenario not previously evaluated by the NRC staff for McGuire. We conclude that the proposed amendment does involve a significant hazards consideration. We are, therefore, issuing a notice (copy attached) of opportunity for prior hearing.

Sincerely, QBO$0ock$500$369 PDR 3A Thomas M. Novak, Assistant Director p

for Licensing Division of Licensing

Enclosure:

As stated cc: See next page pgsicnnED 02IGIUAL Cwtifi d B.f_

4 Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station cc:

Mr. A. Carr Dr. John M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 Mr. F. J, Twogood County Manager of Mecklenburg County Power Systems Division 720 East Fourth Street Westinghouse Electric Corp. Charlotte, North Carolina 28202 P. O. Box 355 Pittsburgh,' Pennsylvania 15230 Chairman, North Carolina Utilities Commission Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch J. Michael McGarry, III, Esq. Division of Facility Services Bishop, Liberman, Cook, Purcell Department of Human Resources -

and Reynolds P.O. Box 12200 1200 Seventeenth Street, N.W. Raleigh, North Carolina 27605 Washington, D. C. 20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission Route 4. Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 R. S. Howard Operating Plants Projects Regional Manager Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230

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