TXX-6916, Final Deficiency Rept CP-87-111 Re Loose Connection on One Phase of Circuit Breaker Terminal in Unit 2 Motor Control Ctr.Initially Reported on 871012.Loss of Remote Manual Control of Valve Not Detrimental to Safe Operation of Plant
| ML20236M075 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/09/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-111, TXX-6916, NUDOCS 8711120049 | |
| Download: ML20236M075 (2) | |
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{{#Wiki_filter:n-y.- i i j annes . :::lll:' = Log ~# TXX-6916' . File #~10110 _" ~_. E '908.3 " # 'U"" 1UELECTRIC November.9, 1987-Wmiarn G. Coumil. Eaccutive Vice Preshknt U. S. Nuclear Regulatory Commission Attn: Document Control. Desk i Washington, D. C. 20555 g
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) DOCKET NO. 50-446 MOTOR CONTROL CENTER LOOSE TERMINAL j SDAR:.CP-87-111(FINALREPORT) Gentlemen: On October 12, 1987, we verbally notified your Mr. L. Ellershaw of a potentially reportable deficiency involving a loose connection on one phase of a circuit breaker terminal in a Unit 2 Motor Control Center (MCC). We have completed our evaluation and concluded this item is not' reportable under the provisions of 10CFR50.55(e). As stated in the Non-conformance report'(NCR CE-87-9151-X), aithird party I inspection of the MCC discovered a loose connection at a connection point. This connection point is one of the power connections supplying a motor operated valve (MOV-2-8351D) located outside containment. This valve is a q j containment isolation valve for-seal injection water to the: reactor coolant 1 pumps (RCPs). The loose terminal does not represent a condition adverse'to the safety of plant operation as: a) M0V-2-83510 is a normally open (de-energized) valve which does not i receive any automatic actuation. signals. The failure mode is iri. the "as-is" position. b) The essential modes of operation for this valve are "open" for. seal injection or " closed" for containment isolation. Flow'into the containment via the charging pumps is essential to provide'. seal injection water to the RCPs, and the valve is required to be closed only when the charging pumps'are not operating..The position of this valve is selected by-the operator via. remote manual operation and not by automatic actuation. Further, the valve i.s equipped with a local handwheel. Use of this' handwheel is a recognized method of secondary actuation'when' desired for containment = isolation. B711120049 871109 PDR-ADOCK 05000446 S PDR 400 North Olive Street', LB SI-Dallas, Texas 73201 '1j ,E_--__
] 3 4 .j TXX-6916 November 9, 1987 Page 2 of 2 -j Based upon these conditions, the potential for loss of remote manual control of this valve is not detrimental to safe operation of the plant. I Supporting documentation is available onsite for your Inspector's review. ~Very truly yours, 1 W. G. Counsil WJH/gj ) c - Mr. R. D. Martin, Region IV I Resident Inspectors, CPSES (3) l l 'j) 1 l l l ( l l 'd l =A}}