TXX-6828, Supplemental Deficiency Rept CP-85-13 Re Failures Existing in Esfas.Initially Reported on 850415.Rev of Test Procedures Not Required Due to Deficiency Resolved by Westinghouse Submittal of Hardware Mods.Circuit Installation Completed

Supplemental Deficiency Rept CP-85-13 Re Failures Existing in Esfas.Initially Reported on 850415.Rev of Test Procedures Not Required Due to Deficiency Resolved by Westinghouse Submittal of Hardware Mods.Circuit Installation Completed

ML20236N299
Person / Time
Site:	Comanche Peak
Issue date:	11/10/1987
From:	Counsil W, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-85-13, TXX-6828, NUDOCS 8711160107
Download: ML20236N299 (2)

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l wn w c. counsa November 10, 1987 l Encutive Vice Pn'si&nt I

r ' 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

, . UNDETECTABLE FAILURE IN ENGINEERED SAFETY FEATURES ACTUATION SYSTEM

.SDAR CP-85-13 (SUPPLEMENTAL REPORT) i Gentlemen: '

On April 15', 1985, in our report logged TXX-4457, we notified you of a deficiency regarding failures existing in our Engineered Safety Features i Actuation Systems (ESFAS) which we deeined reportable under the provisions of 1 10CFR50.55(e). This item was subsequently identified by our last report l logged TXX-6435,' dated May 13, 1987, as an item for which a finhl report had I been issued but the corrective actions required revision. This report is l submitted to status the implementation of those corrective actions. 1 In our report TXX-4457, we indicated our corrective actions would involve a

. revision to our test procedures to incorporate the CPSES specific testing requirements' recommended by Westinghouse. Since that report, this deficiency has been resolved by Westinghouse's submittal of hardware modifications (Field.

Changes.TBM-10639 and TCXM-10601) which have been implemented by Design Modification DM-86-013 and Design Change Authorization 23881 for Units 1 and 2 respectively. The modification consists of a new switch and meter arrangement that provides correct results under all test conditions. The installation of the new circuit has been completed.

' Ode to the implementation of these hardware modifications, revision of the r test procedures as described in TXX-4457 is no longer required. l 1

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