TXX-6786, Interim Deficiency Rept CP-87-84 Re Long Electric Cable Leads in Secondary Meter & Relay Current Transformer Circuits Which Could Result in Inoperability of Protective Relays.Initially Reported 870903.Next Rept Submitted 871218
| ML20235R115 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/02/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-84, TXX-6786, NUDOCS 8710070795 | |
| Download: ML20235R115 (1) | |
Text
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== Log # TXX-6786 i
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$ File # 10110 908.3~
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1UELECTRIC
" '0" 00'00('}
October 2, 1987 William G. Counsil
_ Eucuene Vice 1%ident _
U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20355
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 DG SECONDARY METER AND RELAY CT CIRCUIT CABLE LEADS SDAR: CP-87-84 (INTERIM REPORT)
Gentlemen:
1 On September 3, 1987, we verbally notified your Mr. H. S. Phillips.of a !
deficiency involving long electric cable leads in the secondary meter and l relay Current Transformer (CT) circuits for the Emergency Diesel Generator l (DG) which could result in inoperability of the protective relays in the ci rcui t . This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
ANSI Standard C57.13 requires a percent ratio error not exceeding 10% 'in CT j secondary circuits. Duringthepreparationofcalculation16345-EE(B)-023- l 13G-0, the error for these circuits was found to be 28.57%.
We are continuing our evaluation of the impact of this' issue u)on the-safety l of plant operations. Our next report on this issue will be suamitted not later than December 18, 1987.
Very truly yours, j l
W. G. Counsi1 j WJH:tgj l c- Mr. R. D.' Martin, Region IV Resident Inspectors, CPSES (3) 1' lFoA18ESSkh
,e.
s 400 North Olise Street t.B 81- ' Dallas, Texas 75201
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