ML20207M186

Forwards Safety Evaluation Advising That Drywell Has Adequate Design Margins for Operation During Cycle 12.Util Shall Provide Comprehensive Plans for Mitigating Corrosive Attack on Drywell Shell by 870630

ML20207M186
Person / Time
Site:	Oyster Creek
Issue date:	12/29/1986
From:	Zwolinski J Office of Nuclear Reactor Regulation
To:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
Shared Package
ML20207M191	List: ML20207M186 ML20207M208
References
TAC-64016, NUDOCS 8701130113
Download: ML20207M186 (2)

Text

I December 29, 1986 s

4 Docket No. 50-219 DISTRM8UTMON,

.Docte4 F1'e/ BTurovlin ACRS (10)

NRC PDR CTan OC File Mr. P. B. Fiedler Local PDR GHolahan Vice President and Director BWD1 Reading CMiles, OPA Oyster Creek Nuclear Generating Station RBernero NThompson Post Office Box 388 EJordan 0GC-BETH (Info Only)

Forked River, New Jersey 08731 BGrimes JDonohew JPartlow JStang

Dear Mr. Fiedler:

Glainas JZwolinski RHermann CJamerson

SUBJECT:

INTERIM OPERATION FOR CYCLE 12 FOLLOWING CORROSION OF THE OUTER SURFACE OF THE DRYWELL SHELL (TAC 64016)

Re: Oyster Creek Nuclear Generating Station In late November 1986, GPU notified the NRC of a condition involving corrosion of the outer surface of the drywell shell. Three meetings were held between the staff and GPU on December 1, 1986, December 10, 1986 and December 19, 1986 to discuss this subject.

By letter dated December 19, 1986, GPUprovided,forstaffreview, justification for interim operation for Cycle 12R. The staff has completed its review of the submittal. Our safety evaluation is enclosed. Based on our review, the staff concludes that the original code allowables for the drywell are met should the drywell plates be locally reduced in the sand cushion area to 0.700 inch. Therefore, with a conservatively assumed corrosion rate, the drywell has adequate design margins for operation during Cycle 12.

We, however, require GPU take the following actions:

1. GPU has committed "to continue the UT shell thickness test programs at future outages of opportunity including forced outages otherwise requiring drywell entry during the next cycle." The staff requests that GPU provide the NRC with the plans for the intended inspection and, should there be no forced outages of sufficient duration prior to the mid point of the operating cycle, perform the inspection no later than September 30, 1987. This activity is necessary to assure the corrosion rate assumed by the licensee is bounding.

2. GPU shall, by June 30, 1987, provide comprehensive plans for mitigating the corrosive attack on the drywell shell and any other intended long term corrective actions it may deem necessary for staff review and approval.

Sincerely, Original signed by l[OIINbN No$$352 John A. Zwolinski, Director p PDR BWRProjectDirectorate#1 Division of BWR Licensing

Enclosure:

Safety Evaluation cc: See next page I /

/ A DBL:BWD1 DB : 301 DBL:BWD1 CJamerso . JSt d?jg JZwolinski S/pl/86 i)./, ;/86 st/9/86 1

]

' t-'

Mr. P. B. Fiedler Oyster Creek Nuclear Oyster Creek Nuclear Generating Station Generating Station cc:

Mr. Ernest L. Blake, Jr. Resident Inspector '

Shaw, Pittman, Potts and Trowbridge e/o U.S. NRC 2300 N Street, NW Post Office Box 445 '

Washington, D.C. 20037 Forked River, New Jersey 08731 J.B. Liberman, Esquire Commissioner Bishop, Liberman, Cook, et al. New Jersey Department of Energy 1155 Avenue of the Americas 101 Commerce Street-1 New York, New York 10036 Newark, New Jersey 07102 Mr. David M. Scott, Acting Chief Regional Administrator, Region I Bureau of Nuclear Engineering

! U.S. Nuclear Regulatory Commission Department of Environmental Protection 631 Park Avenue CN 411 King of Prussia, Pennsylvania 19406 Trenton, New Jersey 08625 -

BWR Licensing Manager GPU Nuclear Corporation 1 Upper Pond Road '

i Parsippany, New Jersey 07054 t

Deputy Attorney General State of New Jersey  !

Department of Law and Public Safety l 36 West State Street - CN 112 i Trenton, New Jersey 08625 Mayor

, Lacey Township 818 West Lacey Road i Forked River, New Jersey 08731 '

Licensing Manager Oyster Creek Nuclear Generating Station i Mail Stop: Site Emergency Bldg.

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

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