ML20211E599

Responds to IE Bulletin 86-001 Re ECCS Which Incorporates Designated Min Flow Valves.Core Spray Sys Completely Redundant W/Redundant Pumps Provided in Each Sys.Concerns of Bulletin Inapplicable to ECCS Design at Plant

ML20211E599
Person / Time
Site:	Oyster Creek
Issue date:	06/04/1986
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-86-001, IEB-86-1, NUDOCS 8606160176
Download: ML20211E599 (2)

Text

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N GPU Nuclear Corporation

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'e=8r388 Forked R,ver, New Je:sey 08731-0388 609 971-4000 Writer's Direct Dial Numcer:

June 4, 1986 Dr. Thomas E. Murley, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 IE Bulletin 86-01 Response A review of the subject bulletin was conducted.

At the Oyster Creek plant, the only Emergency Core Cooling System (ECCS) which incorporates designated minimum flow valves is the Core Spray System.

In this system minimum flow is established through an air operated valve from each. ump discharge to the suppression chamber. This line also contains a flow regulating orifice and a check valve.

The core spray minimum flow valves are air operated gate valves which are maintained in the closed position by control air through a three-way solenoid valve. The minimum flow valves open upon initiation of the core spray pumps via a contact in the pump breaker and remain open while the system is in operation. The valves open automatically and position indication is provided in the control room.

The minimum flow valves are designed to fail in the open position upon loss of air due to either loss of the control air system or failure of the solenoid operated supply valve.

The core spray system is completely redundant with redundant pumps provided in each system. Failure of the primary pump in either system will cause automatic initiation of the backup pump.

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Regional Administrator Re: IE Bulletin 86-01 Page 2 The review of the octuation logic and failure modes of the minimum flow valves, as described above, shows that concerns discussed in IE Bulletin 86-01 are not applicable to the Oyster Creek ECCS design.

Should you have any questions, please contact Mr. Joseph D. Kowalski, Oyster Creek Licensing Manager.3t (609)971-4643.

Very truly yours, bs) i e

. TieB er Vice President and Director Oyster Creek PBF/GB/ dam Sworn to and Subscribed before me this VM day of June,1986.

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mminim Expires June 5,1986 cc: Director Nuclear Reactor Regulation US Nuclear Regulatory Commissions Washington, DC 20555 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 Oyster Creek Nuclear Generating Station Forked River, NJ 08731 l

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