View source for 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

{{Adams
| number = ML20235R115
| issue date = 10/02/1987
| title = 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
| author name = Counsil W
| author affiliation = TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
| addressee name = 
| addressee affiliation = NRC OFFICE OF ADMINISTRATION &amp; RESOURCES MANAGEMENT (ARM)
| docket = 05000445, 05000446
| license number = 
| contact person = 
| document report number = CP-87-84, TXX-6786, NUDOCS 8710070795
| document type = DEFICIENCY REPORTS (PER 10CFR50.55E &amp; PART 21), TEXT-SAFETY REPORT
| page count = 1
}}

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                                                       ==                             Log # TXX-6786 i
                                                       =-
                                                               $                      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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