ML20235E019

Forwards Safety Evaluation Re Corrosion of Drywell Shell at Facility.Licensee Meets NRC Requirements as Specified in 861224 Safety Evaluation

ML20235E019
Person / Time
Site:	Oyster Creek
Issue date:	09/22/1987
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
Shared Package
ML20235E022	List: ML20235E019 ML20235E066
References
TAC-65448, NUDOCS 8709250454
Download: ML20235E019 (3)

Text

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September 22, 1987 Docket No. 50-219 Mr. P. B. Fiedler Vice President and Director Oyster Creek Nuclear Generating Station Post Office Box 388 Forked River, New Jersey 08731

Subject:

LICENSEE ACTIONS TAKEN AND ACTION PLANS FOR MITIGATING THE CORROSIVE ATTACK ON THE DRYWELL SHELL OF THE OYSTER CREEK NUCLEAR. GENERATING STATION (TAC 65448)

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 1,10, and 19,1986 to discuss this subject.

By letter dated December 19, 1986, GPU provided, for staff review, justi-fication for interim operation for Cycle 12R. Based on our review of this information the staff concluded in our letter and Safety Evaluation dated December 29, 1986 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, have required GPU to 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 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 co rosive attack on the drywell shell and any other intended long terr corrective actions it may deem necessary for staff review and arproval.

As a fulfillment of our requirement and, of its commitment, GPU made a presentation on June 11, 1987 to the NRC staff of the actions taken and plans under study to resolve our concerns. Details of this presentation were documented in the meeting summary dated June 18, 1987.

8709250454 DR s70922 1 ADOCK 05000219 PDR

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~2-The staff has completed its review:of. the information presented. Our Safety

' Evaluation is. enclosed. . Based on our review, the staff concludes that the licensee has met the, staff's requirements :as specified-in the staff's December 29, 1986 Safety Evaluation. The staff-also. a those planned including the commitments, (1)topproved the'cathodic implement actions protection taken and as a means of corrosion arrest, (2) to' monitor wall thickness by UT.at outages of opportunities for .several. years, and f 3) to identify and mininize futcre water incursions'into the sand bed.

You are requested:to advise the staff when the cathodic protection system is installed and operational.

Sincerely,

/s'/

John F. Stolz, Director-Project Directorate I-4' Division of Reactor Projects I/II

Enclosure:

As stated cc w/ enclosure:

See next page Distribution:

1RicliWPFW6 NRC & Local PDRs PD # I-4 Files S. Varga B. Boger S. Norris A. Dromerick OCG-Bethesda E. Jordan J. Partlow ACRS (10)

LAP I-4 PDI-4 T-4 i SNDrr Ar ick:LM J z C)/pA/87 / /87 / /87

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

Ernest L. Blake, Jr. Resident Inspector Shaw, Pittman, Potts and Trowbridge c/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 l Bishop. Liberman, Cook, et al. New Jersey Department of Energy l 1155 Avenue of the Americas 101 Commerce Street l New York, New York 10036 Newark, New Jersey 07102 l Mr. David M. Scott, Acting Chief Regional Administrator, Region I Bureau of Nuclear Engineering i U.S. Nuclear Regulatory Comission Department of Environmental Protection 631 Park Avenue CN 411 l King of Prussia, Pennsylvania 19406 Trenton, New Jersey 08625 BWR Licensing Manager l GPU Nuclear Corporation  !

1 Upper Pond Road i Parsippany, New Jersey 07054 i Deputy Attorney General State of New Jersey Department of Law and Public Safety 36 ' West State Street - CN 112 Trenton, New Jersey 08625 Mayor Lacey Township 818 West Lacey Road Forked River, New Jersey 08731 Licensing Manager Oyster Creek Nuclear Generating Station Mail Stop: Site Emergency Bldg.

P. O. Box 388 4 Forked River, New Jersey 08731 i j

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