TXX-6802, Interim Deficiency Rept CP-87-86 Re Potentially Undersized Circuit Breakers in Class 1E 118 Vac Distribution Panels. Initially Reported on 870903.Evaluation Continuing.Next Rept Will Be Submitted by 880115
| ML20235V533 | |
| 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-87-86, TXX-6802, NUDOCS 8710150210 | |
| Download: ML20235V533 (1) | |
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FE Log # TXX-6802 File # 10110
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908.3 M# ELECTRIC Ref. # 10CFR50.55(e)
October 5, 1987 Wimarn G. Counsil Emutwe Vke Preskkur V. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington,-D. C. 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 118 VAC CIRCUIT BREAKER SIZING SDAR: CP-87-86'(INTERIMREPORT)
Gentlemen:
On September 3,1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving potentially undersized circuit breakers in Class IE 118 VAC distribution panels.
During the design validation program, a calculation has been completed which indicates three branch circuit breakers in the Class IE 118 VAC instrument bus distribution Janels may be undersized.
This is an interim report of a potentially reporta)1e item under the provisions of 10CFR50.55(e).
Our evaluation of this issue is continuing to determine the effects of these conditions, specifically, involving inadvertent trips of Class 1E circuits and 4
I the operability of Class 1E equipment. We expect to submit our next report by i
January 15, 1988.
Very truly yours
'Id W. G. Counsil WJil:tgj c-Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) r#
s 400 Nonh Olive Street LB 81 Dallas. Texas 75201
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