TXX-6922, Supplemental Deficiency Rept CP-82-09 Re Solid State Protection Sys Undetectable Failure.Initially Reported on 821130.Test Procedures Revised to Incorporate facility-specific Requirements Recommended by Westinghouse

Supplemental Deficiency Rept CP-82-09 Re Solid State Protection Sys Undetectable Failure.Initially Reported on 821130.Test Procedures Revised to Incorporate facility-specific Requirements Recommended by Westinghouse

ML20236N620
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-82-09, CP-82-9, TXX-6922, NUDOCS 8711160253
Download: ML20236N620 (2)

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U. S. Nuclear Reguiatory Commission i Atta: Document Control Desk I 4,, Washingt0n,: D. C. 20555 .

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SUBJECT:

CONANCHE' PEAK STEAM ELECTRIC STATION (CPSES) i DOCKET NOS. 50-445'AND,50-446 l

SOLID' STATE'0ETECTION S'rSTEM UNDETECTABLE FAILURE I SDAR: CP-82-09 (SUPPLEMENTAL REPORT)  !

i Gen tlemen:

On November 30, 1982, in our report logged TXX-3595, we notified you'of a

' deficiency involving Solid State Protection System (SSPS). undetectable fallure twhich'we. deemed reportable under the provisions of 10CFR50.55(e). This issue. l was' subsequent 1y' identified by our report logged TXX-6435, dated May 13, 19873 as an item for which a final report had been issued but, the corrective

, actions. required revislon. This report is submitted to status the implementation'of.those. corrective actions.

In'.our. report TXX-3595, we indicated our corrective actions would involve a a revision to our test procedures to' incorporate the CPSES specific testing ~!

. requirements recommended by Westinghouse. Since that report, Westinghouse has

. submitted : instructions to modify the 'SSPS master relay . test panel .to provide j positive' detection of're-establishment'of the slave relay coil circuits after j testing. These instructions were transmitted via field Chenge Notices TBXM- 1 10605A and TCXM-10578 and were implemented via Design Change Authorizations 18348 (Unit'1) and 19853 (Unit 2). Rework for Unit 1 and Unit 2 was completed <

on August 16, 1983, and June 26, 1987 respectively. 1

..Due.to the implementation of these hardware modifications, revision of our test procedures as described in TXX-3595 is no longer required, l

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9711160253 871110 PDR ADOCK 05000445  !

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'C Txx-6922 November 10, 198)

Page 2 of 2 This concludes our evaluation and corrective action.for this issue.

Suoporting documentation is available for your inspectors to review at the CPSES site.

Very_truly.yours, I h. (.ou. n sc.Y

_ W. G. Counsil

, 'i- .. [ I gyb,J.S. Marshall Supervisor, Generic Licensing -l CBC/gj

-c .Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) i i

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