ML18093A537

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Forwards SER Addressing Breaker Coordination for 1E Circuits Re Internal or External Hazards.Ser Confirms Ability of Plant to Achieve Safe Shutdown in Event of Internal or External Hazard
ML18093A537
Person / Time
Site: Salem  PSEG icon.png
Issue date: 12/10/1987
From: Corbin McNeil
Public Service Enterprise Group
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML18093A538 List:
References
NLR-N87226, NUDOCS 8712280011
Download: ML18093A537 (2)


Text

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Public Service Electric and Gas Company Corbin A. McNeill, Jr. Public Service Electric and Gas Company P.O. Box236, Hancocks Bridge, NJ 08038 609 339-4800 Senior Vice President -

Nuclear December 10, 1987 NLR-N87226 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:

SALEM GENERATING STATION UNIT NOS. 1 AND 2 DOCKET NOS. 50-272/50-311 SAFETY EVALUATION - BREAKER COORDINATION Attached for your information is the Safety Evaluation Report (SER) addressing breaker coordination for lE circuits with respect to internal or external hazards. The submittal of this SER completes PSE&G's commitment made during the October 7, 1987 meeting in your off ices in King of Prussia.

The SER identifies three cases of coordination; fully coordinated as found, fully coordinated after modification, and justified partial coordination. Fully coordinated circuits were those circuits found coordinated for all realistic ranges of available short circuits. Fully coordinated after modifications are circuits for which coordination could be extended to include the full range of realistic short circuit currents with relatively simple modifications. Modifications include adjusting the setpoints of relays on the 4 KV and 480 VAC circuits, installation of solid state trip devices on 480 and 230 VAC circuits, and installation of fuses on 125 VDC circuits. These modifications will be completed on each Unit prior to restart of that Unit. The partially coordinated circuits were evaluated to demonstrate that safe shutdown of the plants would not be impaired given the occurrence of an internal/external hazard.

This is documented in the attached SER which concludes that adequate breaker coordination exists at all voltage levels for both plants, under postulated internal or external hazard conditions.

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\* Document Control Desk 2 PSE&G's ongoing electrical evaluation program has identified various circuits with voltage drops outside of the design requirement. These are being addressed with the installation of interposing relays and/or additional power cables. These modifications will be completed on each Unit prior to the restart of that Unit. PSE&G plans to restart Salem Unit 2 on or about December 13, 1987, consistent with the information provided in the Special Inspection Exit meeting held on December 4, 1987.

Similarly, Unit 1 will restart at the end of the current refueling outage, scheduled for December 27, 1987.

Should you have any questions, please do not hesitate to contact us.

Sincerely, Attachment C Mr. D. c. Fischer USNRC Licensing Project Manager Mr. T. J. Kenny USNRC Senior Resident Inspector Mr. w. T. Russell, Administrator USNRC Region I Mr. D. M. Scott, Chief Bureau of Nuclear Engineering Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628