ML20112J940

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Clarifies Position on Implementation of NUREG-0737,Items II.K.3.21, Restart of Core Spray & II.F.1.5, Containment Water Level Monitor. Rationale & Justification for Torus Water Level Indication Sys Configuration Provided
ML20112J940
Person / Time
Site: Oyster Creek
Issue date: 04/03/1985
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Eisenhut D
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-2.K.3.21, TASK-TM NUDOCS 8504090260
Download: ML20112J940 (2)


Text

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GPU Nuclear Corporation g gf Post Office Box 388 Route 9 South f

l Forked River New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:

April 3, 1985 Darrell G. Eisenhut, Director i Division of Licensing I Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Eisenhut:

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Clarification of Nureg 0737 Items II.K.3.21.

" Restart of Core Spray" and II.F.1.5 " Containment Water Level Monitor" The purpose of this memo is to clarify our positicn on the installation of two NUREG 0737 related items. The first of these items relates to item II.K.3.21, " Restart of Core Spray". We would like to advise you of a discrepancy existing between our description of a proposed modification to our core spray system sent to you for approval on March 28, 1983 (and your subsequent SER) and the actual scope of the modification which was completed before startup from our cycle 10 refueling outage.

In the above referenced correspondence Section 4.3.1.1.e we stated "The operator will be able to throttle the parallel isolation valves and have better control over the reactor water level during an emergency."

Subsequently, as a result of NRC IE Information Notice No. 83-55 dated August 22, 1983 concerning the misapplication of valves for throttling beyond the design range, and subsequent engineering evaluations, this portion of the modification, was deleted from the scope of the overall project. In deleting this portion of the modification it did not affect any requirement of NUREG 0737, item II.K.3.21, which dealt with the automatic restart of Core Spray.

In addition, we would like to clarify an additional item related to NUREG 0737. As identified during IE inspection 82-21 the first twenty-seven feet of piping from the torus for the Torus Water Level indication system is not redundant. This deviation from NUREG 0737 criteria was not identified in previous GPUN correspondence. The following provides our rationale and justification for the system configuration:

A common connection is provided for both redundant channels on the bottom of the Torus. This approach is required due to the lack of available connections on the Torus. The twenty-seven feet in question brings the line 8504090260 850403 9 PDR ADOCK 050 P

GPU Nuciear Corporation is a subsidiary of the General Public Utilities Corporation gyg llC

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'Darrell G. Eisenhut, Director out from under the torus to a point where it splits into two redundant 3/4 inch pipes for a run to_the two redundant transmitters. A high quality installation has been provided and installed under ASME III Section 3.

Failure modes considered for the piping sensing system included seismic, missile and torus dynamic considerations. The system is seismically designed and has been designed to accommodate torus dynamic movement. There are no high energy lines in the area. Fifteen feet ot the line is run beneath the Torus itself, thereby eliminating the possibility of missiles from above. The first 16 feet is also contained with a steel pipeguard which totally encloses all exposed surfaces. The balance of the non-redundant piping is near the suppression chamber wall and is not considered to be in an exposed position.

Although not redundant from the comon connection for 27 feet, the system is redundant thereafter. The sensing line is adequately protected against mechanical failure and there is no advantage in providing redundant sensing lines for the section in question.

Should you require any further information please contact Brenda Hohman,

. Oyster Creek Licensing Engineer at (609) 971-4642.

Very truly yours, 3

P edler Vice President and Director Oyster Creek PBF/BH/ dam

  1. 0889A cc: Dr. Thomas E. Murley, Administrator' Region I

-U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

.NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731

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