ML20133E749

Requests Interim Evaluation Re Acceptability of Automatic & Manual Control of Emergency Electrical Power Sys by 850607, Per 850516 Meeting W/Util.Summary of Meeting Encl.W/O Encl

ML20133E749
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/28/1985
From:	Lainas G Office of Nuclear Reactor Regulation
To:	Rubenstein L Office of Nuclear Reactor Regulation
References
TAC-51955, NUDOCS 8510090537
Download: ML20133E749 (2)

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May 28, 1985 G MEMORANDUM FOR: Lester A. Rubenstein, Assistant Director V for Core and Plant Systems Division of Systems Integration FROM: Gus C. Lainas, Assistant Director for Operating Reactors Division of Licensing

SUBJECT:

FORT ST. VRAIN EMERGENCY ELECTRICAL POWER SYSTEMS

References:

1. TIA 85-02, Rev.1, dated February 26, 1985, Task 3

2. Memo to D. G. Eisenhut from R. P. Denise, Review Assistance for Fort St. Vrain's Emergency Power Systems, dated January 15, 1985.

3. Memo to E. Tourigny from K. Heitner, Suwiary of May 16 meeting with Public Service of Colorado concerning Electrical Power Systems at Fort St. Vrain.

Under TIA 85-02 Rev. 1 (Reference 1), your staff was requested to provide assistance in evaluating the acceptability of the Fort St. Vrain emergency electrical power systems (Reference 2). Specifically, Task 3 of this review was to examine the transfer logic and load carrying capacity of the Emergency O o4esei cenerators (toos).

On May 16, 1985, your staff rret with the licentee to discuss these issues.

A sumary of this meeting is attached (Reference 3). At this meeting, your staff expressed key concerns about Fort St. Vrain's emergency electrical power systems as follows:

- In numerous instances plant drawings showed that logic circuits for the redundant emergency electric power trains were not independent, and

- The 4 KV rapid transfer system could force use of the emergency diesel generators in lieu of selecting the second (auxiliary) offsite power source.

However, your staff stated that their concerns were only about the automatic control of emergency electric power systems. Manual control of the emergency electric power systems could still be accomplished even if the automatic systems failed.

At the meeting, we requested that the licensee respond promptly to these con-cerns and supply additional information as noted in Reference 3. We requested that the licensee should provide a justification for continued operation as part of their response to these concerns.

O 8510090537 850520 PDR ADOCK 05000267 P PDR

O However, we anticipate that the licensee will request NRC approval to restart the plant shortly. Therefore, we request that you provide us with your current evaluation as per TIA 85-02, Rev. 1, Task 3, by June 7, 1985. We will consider this evaluation as interim, pending receipt of a complete response from the licensee.

h Gus C. Lai as, Assistant Director for Operating Reactors Division of Licensing i

DISTRIBUTION:

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