TXX-6794, Interim Deficiency Rept CP-87-95 Re Input Voltage to Uninterruptible Power Supply Inverter IV 1PC3.Voltage Drop Due to Line Loss May Reduce Inverter Input Voltage to Less than Min Value.Evaluation Continuing.Next Rept by 880108
| ML20235V793 | |
| 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-87-95, TXX-6794, NUDOCS 8710150320 | |
| Download: ML20235V793 (1) | |
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=M Log # TXX-6794 L
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908.3 Ref, # 10CFR50.55(e) 7t# ELECTRIC October 5, 1987-William G. Counsli Execu,ive Vice President U.
S'. Nuclear Regulatory Commission
'Attnt' Document Control Desk Washington, D. C. 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET.NOS. 50-445 AND 50-446 UNINTERRUPTIBLE POWER SUPPLY SDAR: CP-87-95 (INTERIM REPORT)
Gentlemen:
On September 3,1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving the input voltage to the Station uninterruptible Power Supply inverter IV 1PC3. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
S)ecifically, the minimum input voltage required by the inverter is 105 VDC, i
w11ch is the associated Class 1E battery's minimum output by design.
The voltage drop (due to line loss) between the battery and the inverter has not been considered and may reduce the input voltage at the inverter to less.than 105 VDC.
Our evaluation of this issue is continuing.
We expect to submit our next report by January 8,1988.
Very truly yours, W. G. Counsil WJH:tgj c-Mr. R. D. Martin, Region, IV Resident inspectors, CPSES (3) 8710150320 e71005 PDR ADOCK 05000445 S
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