TXX-6801, Interim Deficiency Rept CP-87-89 Re Voltage Drop Between Class 1E Batteries & Station Uninterruptible Power Supply. Initially Reported on 870903.Evaluation Continuing to Determine Impact on 125 Volt Dc Sys Design.Next Rept 880115
| ML20235U636 | |
| 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-87-89, TXX-6801, NUDOCS 8710140175 | |
| Download: ML20235U636 (1) | |
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filELECTRIC October 5, 1987 William G. Csumil Executive Vwe l'rranierrt U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555
SUBJECT:
COMANCilE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 125 VDC 10 SUPS VOLTAGE DROP SDAR: CP-87-89 (INTERIM REPORT)
Gentlemen:
On September 3,1987, we verbally notified your Mr. II. S. Phillips of a deficiency involving the voltage drop (between the Class 1E batteries and the 1
Station Uninterruptible Power Supply SUPS).
S)ecifically, documentation is j
not available which indicates the voltage dro) >etween the Class IE battery terminals and the SUPS was considered in the )attery sizing calculations.
This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
Our evaluation of this issue is continuing to determine the impact of this deficiency on the design of the 125 VDC system. We expect to submit our next report by January 15, 1988.
j Very truly yours, W. G. Counsil WJH:tgj c-Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) 8710140175 871005 PDR ADOCK 05000445 s
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