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
| 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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SUBJECT:
CONANCHE' PEAK STEAM ELECTRIC STATION (CPSES) i DOCKET NOS. 50-445'AND,50-446 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
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. 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.
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..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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'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
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'i-gyb,J.S. Marshall Supervisor, Generic Licensing
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.Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) i i
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