ML20135A795

Responds to 850816 Telcon Request for Addl Info on Generic Ltr 83-28,Item 4.3 Re Bypass Breaker Status Lights & Seismic Qualification of Shunt Trip Attachment.Diagram of Revised Design of Control Room Status Lights Encl

ML20135A795
Person / Time
Site:	Beaver Valley
Issue date:	09/03/1985
From:	Carey J DUQUESNE LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
GL-83-28, TAC-53166, NUDOCS 8509100276
Download: ML20135A795 (3)

Text

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S2pttmbzr 3, 1985 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Generic Letter 83-28, Item 4.3 Bypass Breaker Status Lights and Seismic Qualification of STA Page 2

Response

The review of the reports is being expedited, however, additional information has been requested from Westinghouse before the review can be completed.

If you have any questions, please contact my office.

Very tr y yours, Carey Vice President, Nuclear Attachments cc: Mr. W. M. Troskeski, Resident Inspector U.S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 Mr. D. R. Lasher Instrument and Control System Branch dail Stop P-1030 U.S. Nuclear Regulatory Commission Washington, DC 20555 Director, Safety Evaluation and Control Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond, VA 23261 Mr. Peter Tam, Project Manager U.S. Nuclear Regulatory Commission Phillips Building Washington, DC 20555

- Mail Stop 438 -

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'Af Telephone (412) 393-6000 Nuclear Group P.O. 8ox 4 Shippingport, PA 15077-0004 September 3, 1985 U.S. Nuclear Regulatory Division of Licensing Attn: Steven A. Varga, Chief Operating Reactors Branch #1 Division of Licensing Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Generic Letter 83-28, Item 4.3 Bypass Breaker Status Lights and leismic Qualification of STA Centlemen:

By letters dated January 14, 1985, and May 10, 1985, we provided responses to the Safety Evaluation (SE) on Generic Letter 83-28, Item 4.3 (dated November 8, 1984) and the NRC's position on bypass breaker status indication (dated March 20, 1985). Per telecon on August 16, 1985, the NRC staff requested additional information on this item to complete the SE.

The information requested and Beaver Valley - Unit I responses are as follows:

1. Revise the design of the bypass breaker control room status lights sueli that they are disconnected when the breaker is in the TEST and DISCONNECTED position to avoid operator confusion when the breaker is not RACKED IN.

Response

During the telecon, DLC committed to propose a revision to the design of the bypass breaker status lights. Since then, we have revised the design of the status light circuit for the bypass breakers by placing the lights in series with a cell switch to accomplish the above.

Attached is a preliminary electrical elementary diagram of the automatic shunt trip. modification.

2. The results of our review of the seismic qualification reports on the ahunt trip attachment and auto shunt trip panel.

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