ML20207M117

Advises That Use of Blind Spectacle Flanges to Replace Faulty Containment Isolation Valves Acceptable,Per Mod in Rev 2 to LER 84-031 Re Elimination of Main Steam Condensate Drain Valves Function Because of 841205 Failure to Operate

ML20207M117
Person / Time
Site:	Oyster Creek
Issue date:	12/24/1986
From:	Donohew J Office of Nuclear Reactor Regulation
To:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
References
TAC-64079, NUDOCS 8701130094
Download: ML20207M117 (3)

Text

4 UNITED STATES 8"-

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WASHINGTON, D. C. 20555

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December 24, 1986 Docket No. 50-219 Mr. P. B. Fiedler Vice President end Director Oyster Creek Nuclear Generating Stetion Post Office Eox 388 Forked River, New Jersey 08731

SUBJECT:

MSIV BYPASS LINES ISOLATION VALVES (TAC 64079)

Re:

Oyster Creek Puclear Generating Station In the. Licensee Event Report No. 84-031-Revision 2 dated November 10, 1986, the nodification to eliminate the function of the Main Steam condensate drain valves V-1-106, V-1-107, V-1-110 and V-1-111 as primary containment, or drywell, isolation valves was discussed. These valves had failed to operate as required on December 5, 1984. The valves had failed in the partially open position and were deactivated and secured in their isolation position. This is required by the Technical Specifications (TSi for inoperable containment isolation valves.

In the Cycle 11 Refueling (Cycle 11R) outage, a modification was installed to eliminate the function of these valves as containment isola + ion valves. The function of these lines as drains will be provided by other drain lines to the main steam lires. Two removable blind spectacle flanges, one inside and one cutside of containment, were installed in the drain lines to serve as the containment isolation devices for these lines when containment isolation was required. This modification was considered by GPU Nuclear (the licensee) as the most prudent action due to material availability for and time constraints of the Cycle 11R outage. Section 3.5 of the TS requires the capability for containment isolation, or operable containment isolation valves, when the reactor is critical and operating and the plant response to some of the design basis accidents is based on the containment being isolated including these lines.

The blind spectacle flange is an acceptable means for containment isolation.

The staff discussed this modification with GPU Nuclear (the licensee) because these lines could be used to equalize the pressure across the Main Steam Isolation Valves (MSIV) and open the MSIV so that cooling for the core would be provided by the main condenser. This pressure equalization would be done by pressurizing the stean lines when there is high pressure in the reactor vessel and low pressure in the steam lines. However, Oyster Creek has the redundant Isolation Condensers to provide safety-grade cooling to the core when the MSIV are closed. Also, the licensee has stated in the LER that the MSIV could be 8701130094 861224 PDR ADOCK 05000219 S

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Mr. P. B. Fiedler Decenber 24, 1986 opened at 1000 psid across the valve. Therefore, the use of the blind spectacle flanges to replace these containment isolation valves is acceptable.

Sincerely, Original signed by Jack N. Donohew, Project Manager BWR Project Directorate #1 Division of BWR Licensing cc: See next page

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OFFICIAL RECORD COPY

Pr. P. B. Fiedler Oyster Creek Nuclear Oyster Creek Nuclear Generating Station Generating Statior cc:

Mr. Ernest L. Blake, Jr.

Resident Inspector Shaw, Pittman, Potts and Trowbridge c/o U.S. NRC 2300 N Street, NF Post Office Ec/ 445 Washington, D.C.

20037 Forked River, New Jersey 08731 J.B. Liberran, Esquire Consnissicr.er Bishop, Liberman, Cook, et al.

!!ew Jersey Department of Energy 1155 Ivenue of the Americas 101 Connerce Street New York, New York 10036 Newark, New Jersey 07102 Mr. David M. Scott, Acting Chief Regional Administrator, Region I Pureau of Fuclear Engineering U.S. Nuclear Regulatory Crw ission Cepartment of Environmental Protection f3! Park Avenue CN all King of Prussia, Pennsylvania 19406 Trenton, New Jersey 08625 BWR Licensing Manager GPU Nuclear Corporation i Upper Pond Road Parsippany, New Jersey 07054 Deputy Attorney General State cf New Jersey Department of Law and Public Safety 26 West State Street - CP ll?

Trenton, New Jersey 086?S Mayor Lacey Township P.18 West Lacey Road Forked River, New Jersey 08731 Licensing Manager Oyster Creek Nuclear Generatino Station Mail Stop: Site Eraergency Bldg.

P. O. Box 388 Forked River, New Jersey 08731

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