ML20154G474
| ML20154G474 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/12/1988 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-88-30, TXX-88673, NUDOCS 8809200375 | |
| Download: ML20154G474 (1) | |
Text
_
U
[
M F ~--
Log # TXX-88673 File # 10110
__,r r
907.6 Ref.#10CFR50.55(e)
M# ELECTRIC September 12, 1988 E. N N Ywm V. S. Nuclear Regulatory Commission Attn Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET N05. 50-445 AND 50-446 COMS ACTUATION DURING ACCIDENT EVENTS SDAR: CP-88-30 (INTERIMREPORT)
Gentlemen:
On July 18, 1988, we notified you by our report logged TXX-88567 of a deficiency involving Cold Overpressure Mitigation System (COMS) actuation during accident events. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
Saecifically, an unanalyzed condition results during a Main Steamline Brea( or during recovery from a Steam Generator Tube Rupture when the reactor coolant temperature in the faulted loop cold leg drops below the COMS auto-arming temperature.
If a wide is assumed to fail low, the COMS range temperature channel for another loop (which results in an unintended RCS could actuate.
This postulated scenario depressurization) was not considered in the accident analyses.
Our evaluation of this issue is continuing. We will submit our next report by November 2, 1988.
Very truly yours, N 'X O C W. G. Counsil VPC/mlh c - Mr. R. D. Martin, Region IV Resident inspectors, CPSES (3) 8809200375 880912 PDR ADOCK 05000445 S
pNu I &
Mc Nuh obu suen LBil Lkuar Toses 13MI