TXX-6788, Interim Deficiency Rept CP-87-93 Re Motor Control Ctr Starter Coils Which May Not Pick Up at Min Bus Voltage. Initially Reported on 870903.Evaluation Continuing.Next Rept Will Be Submitted by 880108
| ML20235V110 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/05/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-93, TXX-6788, NUDOCS 8710140591 | |
| Download: ML20235V110 (1) | |
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Log # TXX-6788 2
File # 10110 3
3 908.3 Ref # 10CFR50.55(e) 7UELECTRIC October 5, 1987 William G. Counsli Emuine vice I%klent U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D. C. 20555
SUBJECT:
COMANCilE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET N05. 50-445 AND 50-446 MCC STARTER COILS SDAR:
CP-87-93 (INTERIM REPORT)
Gentlemen:
On September 3, 1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving MCC starter coils which may not pick up at minimum bus voltage.
This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
1 S)ecifically, a calculation (16345-EE(B)-007-XXX-13H,RO) has determined that t1e starter coils in 11 circuits may not pick up at minimum bus voltage as a result of excessive circuit length.
Failure of any of these starter circuits to function could result in failure of a Class 1E device to operate properly.
Further technical evaluation is required to assess the safety significance of this condition.
Our next report on this issue will be submitted no later than January 8, 1988.
Very truly yours, W. G. Counsil WJil:tgj c-Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) 8710140591 371005 gDR ADOCK 05000445 PDR 56*1 400 North Olive Street LB SI Dallas, Texas 75201 l h