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: Difference between revisions
StriderTol (talk | contribs) (StriderTol Bot insert) |
StriderTol (talk | contribs) (StriderTol Bot change) |
||
| Line 16: | Line 16: | ||
=Text= | =Text= | ||
{{#Wiki_filter:I M | {{#Wiki_filter:I M== | ||
Log # TXX-6786 i | |||
File # 10110 | |||
=- | |||
=.. | |||
908.3~ | |||
'0" 00'00('} | |||
October 2, 1987 William G. Counsil | 1UELECTRIC October 2, 1987 William G. Counsil | ||
_ Eucuene Vice 1%ident _ | _ Eucuene Vice 1%ident _ | ||
U. S. Nuclear Regulatory Commission Attn: | U. S. Nuclear Regulatory Commission Attn: | ||
Document Control Desk Washington, D. C. 20355 | |||
==SUBJECT:== | ==SUBJECT:== | ||
| Line 31: | Line 32: | ||
DOCKET NOS. 50-445 AND 50-446 DG SECONDARY METER AND RELAY CT CIRCUIT CABLE LEADS SDAR: CP-87-84 (INTERIM REPORT) | DOCKET NOS. 50-445 AND 50-446 DG SECONDARY METER AND RELAY CT CIRCUIT CABLE LEADS SDAR: CP-87-84 (INTERIM REPORT) | ||
Gentlemen: | Gentlemen: | ||
1 On September 3, 1987, we verbally notified your Mr. H. S. Phillips.of a | 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 | ||
deficiency involving long electric cable leads in the secondary meter and l | relay Current Transformer (CT) circuits for the Emergency Diesel Generator l | ||
ANSI Standard C57.13 requires a percent ratio error not exceeding 10% 'in CT | (DG) which could result in inoperability of the protective relays in the ci rcui t. | ||
We are continuing our evaluation of the impact of this' issue u)on the-safety l | This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e). | ||
Very truly yours, | ANSI Standard C57.13 requires a percent ratio error not exceeding 10% 'in CT j | ||
W. G. Counsi1 | 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 j | |||
W. G. Counsi1 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 | s 400 North Olise Street t.B 81- ' Dallas, Texas 75201 | ||
..J}} | |||
Latest revision as of 04:32, 3 December 2024
| 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
I M==
Log # TXX-6786 i
File # 10110
=-
=..
908.3~
'0" 00'00('}
1UELECTRIC 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 j
W. G. Counsi1 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
..J