ML20141J544
| ML20141J544 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 04/21/1986 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| TASK-02-03.B, TASK-2-3.B, TASK-RR NUDOCS 8604280168 | |
| Download: ML20141J544 (2) | |
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J GPU Nuclear CorporaHon Nuclear m's= 388 Forked River,New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:
April 21, 1986 Mr. John A. Zwolinski, Director BWR Project Directorate #1 Division of BWR Licensing U.S. Nuclear Regulatcry Comission Washington, D.C. 20555
Dear Mr. Zwolinski:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 SEP Topic II-3B Flooding Potential and Protection Requirements During the integrated assessment of the subject SEP topic, the NRC staff concluded that water level instrumentation at the intake canal is inadequate.
Accordingly, the staff recomended that atitomatic water level instrumentation, with re. note indication in the control room, be provided in the canal so the operator could implement emergency shutdown procedures when probable maximum hurricane flooding (PMHF) levels occur. PMHF at Oyster Creek has been calculated to be 22 f t. above mean sea level (MSL).
GPU committed to install an automatic water level gauge, with a remote readout, in the intake canal by the end of the Cycle 11 refueling outage.
GPU letter dated July 26, 1985 requested deferment of this installation until operating cycle 11.
Subsequently, in a telephone conference, the NRC staff inquired if GPU could implement compensatory actions in the interim by protecting (e.g.,
sandbagging) the diesel driven fire pumps during a postulated PMHF tc secure an adequate water supply for safe (hot) shutdown. We believe it is not practical to provide a temporary protection such as erecting walls around the fire pump housing using sandbags given its low elevation (approximately 13 ft.
above MSL) and location (approximately 1500 ft. from the intake structure).
We believe an adequate water supply is available at Oyster Creek since station procedure (2000-ABN-3200.31, "High Winds") contains provisions to fill Isolation Condensers and the Condensate Storage Tank whenever high wind conditions, deffrad in the procedure, exist.
If water cannot be obtained from the Condensate Stomge Tank, Oyster Creek Station procedure 307 ("Isolaticn Condenser System") instructs the plant operator to obtain water from the Fire Protection System (i.e., Fire Water Storage Tank) or the Demineralized Water Transfer System (i.e., Demineralized Water Tank) to fill the Isolation Condensers. These sources of water, all of which are available above 86042E'0168 860421 PDR ADOCK 05000219 P
PDR gl GPU Nuclear Corporation is a subsidiary of the General Public utilities Corporation L
23'6" MSL, can supply a combined volume of nearly a million gallons of water to the Isolation Condenser. This is sufficient water volume to maintain the plant in a hot shutdown condition for greater than ten days during which the submerged components can be restored or the tanks can be refilled with temporary pumps and hoses. During the initial review of this SEP topic, the Fire. Water Storage Tank had not been constructed and therefore was not included in the reviiv as an additional source of water.
In the event of a hurricane warning, station procedure 2000-ABN-3200.31, "High Winds", directs the plant operator to monitor and record, by visual observation, the water level at the intake structure. A plant shutdown is required when water level exceeds 4.5 ft. above MSL. Tais procedure will be revised to require a plant shutdown when the water level at the intake structure cannot be verified to be less than 4.5 ft. above MSL. Revision of the procedure will be accomplisned by May 30, 1986. We believe the administrative controls delineated in the station procedure with the proposed revision provide adequate protection of the plant; therefore, the installation of automatic water level indication is no longer required.
Since an. adequate source of make up water is assured by filling storage tanks prior to potential ficoding conditions and plant procedures require water level monitoring with specific directions for high water level conditions, GPUN requests a cancellation of our commitment to install an automatic water level gauge at the intake structure.
Very truly yours, Vice President & Director Oyster Creek PBF:YN: dam:0153A Enclosure cc: Mr. Jack N. Donohew, Jr.
U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue, Phillips Bldg.
Bethesda, MD 20014 Mail Stop No. 314 NRC Resident Inspector Dyster Creek Nuclear Generating Station Forked River, NJ 08731 L '
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