ML20148G358
| ML20148G358 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/18/1988 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-108, TXX-88112, NUDOCS 8801260482 | |
| Download: ML20148G358 (1) | |
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F7 Log # TXX-88112 L
C File # 10110 C
C 910.4 1UELECTRIC R # '*" "'*:50('}
J nuary 18, 1988 w uum c. coumu Etecume Vke Pressdent V. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STAT 10fl DOCKET fl0S. 50-445 AND 50-446 AUXILIARY FEEDWATER PUMP LOW SUCTION TRIP SDAR: CP-87-108 (FINAL REPORT)
Gentlemen:
On October 26, 1987, by our letter logged TXX-6886, we notified you of a reportable deficiency involving the low suction pressure trip function of the Auxiliary Feedwater (AFW) pumps which may render the AFW Systcm inoperable.
In that report we discussed the deficiency description, safety im)lications and corrective action.
The purpose of this report is to status tie corrective action and to address the cause and extent of the deficiency as well as the preventive action and implementation schedule required to resolve the issue, pursuant to the provisions of 10CFR50.55(e).
The cause of this problem appears to have been an inadequate evaluation of a potential instrumentation failure which could inadvertently lead to a pump trip.
The problem could be potentially applicable to all other safety-related pumps which have automated signals that could prevent the performance of the pump intended safety function.
All applicable safety-related pumps were evaluated and no other problems were identified.
The Auxiliary Feedwater Pump low suction pressure trip has been eliminated.
The applicable Design Basis Document (DBD-ME-206) describes the required functions and operating modes of these pumps and anv essential instrumentation features.
The DBD will be used as the design basis for future plant modifications.
This is our final report on this issue.
Very truly yours,
<A4 W. G. Counsil MCP/grr c-Mr. R. D. Martin, Region IV
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