ML20207S248

Advises That W/Inclusion of 8-h Time Limit to Get Drywell Bulk Temp Below 150 F or Shutdown,Proposed Procedures for Remedial Action Acceptable.Updated FSAR Should Be Revised to Include Valve of 150 F

ML20207S248
Person / Time
Site:	Oyster Creek
Issue date:	03/09/1987
From:	Donohew J Office of Nuclear Reactor Regulation
To:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
References
TAC-63313, NUDOCS 8703190188
Download: ML20207S248 (3)

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UNITED STATES NUCLEAR REGULATORY COMMISSION f'

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wAsmNGTON, D. C. 20555 March 9, 1987 Docket No. 50-219 Mr. P. B. Fiedler Vice President and Director Oyster Creek Nuclear Generating Station Post Office Ecx 388 -

Forked River, New Jersey 08731

SUBJECT:

MAXIMUM DRYWELL AIR TEMPERATURE (TAC 63313)

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Re:

Oyster Creek Nuclear Generating Station l

In the Safety Evaluation (SE) enclosed in its letter dated November 22, 1985, the staff concluded that a maximum allowable drywell bulk cir temperature of 150*F was acceptable for Oyster Creek.

In that letter, the staff also stated that the Appendix A Technical Specifications (TS) for Oyster Creek do not have liniting conditions for operation or surveillance requirements on this temperature. The staff requested that you propose such TS because this terperature is part of the licensing basis of the plant or provide a justification for not needing such TS.

Ycu have provided your justification for not needing these TF in your letter dated October 15, 1986. This letter also addressed the algorithm for determiai"g the cryweH btlk teoperature and the evaluation of aging effects of the 150"F on the electrical equipment which must be environmentally cualified in eccordance with 10 CFR 50.49.

In your justification, you state that during normal plant operations, the control room operators monitor and will receive a warning of an increasing r

drywell bulk temperature from the dryvell cooling fan supply air temperature via a recorder and alarm. With an indication of increasing outlet fan temperature, Procedure 2000-0PS-3024.09 requires a calculation of the drywell bulk temperature and then remedial action by the verification of key components or systems such as the Reactor Building Closed Cooling Water System, and drywell fans and coolers.

If the bulk temperature exceeds 150 F, then the operator enters Procedure EMG 2000-3200.02 which provides methods of controlling and reducing the drywell temperature.

Ycu stated that the Oyster Creek procedures recognize the importance of the drywell bulk temperature and provide assurance of the manner in which the plant will be operated. You stated the main difference between the GE BWR-Standard Technical Specifications on drywell temperature and the procedures

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is the stipulation of a time period for renedial action when the design basis is not met.

In order to clarify this point, you propose, in lieu of a TS, the inclusion of an 8-hour time limit in the procedures for tre remedial action.

If the drywell bulk temperature of 150'F cannot be met within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, you propose to have the reactor placed in the shutdown condition.

8703190188 870309 PDR ADOCK 05000219 P

PDR

Mr. P. B. Fiedler March 9, 1987 Attached to your letter dated October 15,.1986, was a sumary of the algorithm used to calculate the drywell bulk temperature. This algorithm is based on the volumetric weighted averaging of four sets of thermocouples to determine the bulk temperature. You state that the operator can also determine this temperature from the average inlet temperature of-the operating drywell recir-culation fans and the average temperature of the GEMAC narrow and wide range reactor water level reference leg. The drywell recirculating fans recirculate air through the drywell.

Because of the conclusion in the staff's SE dated November 22, 1985, that, for the design basis loss-of-coolant accident and main steam line break accident, the differences in the drywell peak' pressures and temperatures due to variations in the initial drywell bulk temperature are insignificant (i.e.,

within one psi and a few degrees), the staff concludes that with your inclusion of an 8-hour time limit to get the drywell bulk temperature belows'150 F or shutdown is acceptable. The time to shutdown should be same as that for Table 3.1.1 of the TS when a limiting condition for operation is not met. The staff also concludes that the algorithm is reasonable.

The maximum allowable drywell bulk air temperature is a design basis parameter for Oyster Creek and, as such, cannot be changed to a higher value without staff approval. As stated in the staff's letter dated November 22, 1985, you should have the Updated Final Safety Analysis Report (FSAR) revised to include the value of 150 F for Oyster Creek.

In your October 15, 1986 letter, you also provided the results of the environ-mental qualificatior, evaluation of the drywell temperature of 150*F on the electrical equipment in the drywell important tu safety. You explained that although there is no immediate need to replace qualified equipment in the drywcll, the replacement of equipment due to aging will be required in the future and will be addressed in the plant's maintenance program. This is acceptable to the staff.

l Sincerely, i

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ck N. Donohew Jr., Project Manager SWR Project Directorate #1 j

Division of BWR Licensing cc: See next page DISTRIBUTION:

Docket File, OGC-BETH (Info only)

NRC PDR EJordan" ~

Local PDR BGrimes ACRS (10)

JPartlow R. Bernero BWD1 Readina J. Zwolinski JDonohew l

CJamerson Glainas GHulman OC File GHolahan NThomspon b:cw BWQ1l [k bWD1 BW luc l

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hi 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 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 Bishop, Liberman, Cook, et al.

New Jersey Department of Energy 1155 Avenue of the Americas 101 Comerce Street New York, New York 10036 Newark, New Jersey 07102 Mr. David M. Scott, Acting Chief Regional Administrator, Pegion I Bureau of Nuclear Engireering U.S. Nuclear Pegulatory Comission Department of Environmental Protectier 631 Park Avenue CN 411 King of Prussia, Pennsylvania 19E0E Trenton, New Jersey 08625 BWR Licensing Manager GPU Nuclear Corporation i Upper Pond Road Parsippany, New Jersey 07054 Deputy Attorney General State of New Jersey Department of Law ard Public Safety 36 Vest State Street - CN 112 Trenton, New Jersey 08625 Mayor Lacey Township 818 West Lacey Road Forked River, New Jersey 08731 Licensing Mananer Oyster Creek Nuclear Generating Station Mail Stop: Site Emergency Bldg.

P. O. Box 380 Forked River, New Jersey 08731