ML20093D132

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Submits Supplemental Response to IE Bulletin 79-25 Re Failure of Westinghouse Bfd Relays in safety-related Sys.Affected Relays Replaced,Inspected & Tested.Monthly Logic Testing Continuing
ML20093D132
Person / Time
Site: Surry  Dominion icon.png
Issue date: 06/28/1984
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
342, IEB-79-25, NUDOCS 8407160139
Download: ML20093D132 (2)


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f VIRGINIA ELucTnIc AND POWER COMPANY HIcnwown, VIRGINIA 20261

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w.L.svan er Vacs Passaount Ncca.sAs oramations June 28, 1984 Mr. James P. O'Reilly Serial No: 342 Regional Administrator N0/JLW:lms Region II Docket Nos: 50-280 US Nuclear Regulatory Commission 50-281 -

101 Marietta Street, NW License No. DPR-32 Atlanta, Georgia 30303 DPR-37

Dear Mr. O'Reilly:

SURRY POWER STATION SUPPLEMENTAL RESPONSE TO IE BULLETIN 79-25 FAILURES OF WESTINGHOUSE BFD RELAYS IN SAFETY RELATED SYSTEMS in Vepco's response to IE Bulletin 79-25 dated December 19, 1979, we committed to a certain course of action for Surry Power Station (North Anna Power Station was not affected). Specifically, Vepco committed to:

a. Replace affected units through the Design Change Program, and, following replacement, accomplish performance tests to verify logic and relay operability.
b. Continue to conduct monthly logic testing on safety-related systems in accordance with Technical Specifications. ,
c. Replace relays in accordance with approved procedures, modified to include testing of new relays for armature overtravel and undertravel.
d. During the course of the replacement program, record and report defective relays and generate and forward a final report with result of all testing.

The status of these coultments is as follows:

a. Affected relays were replaced by accomplishment of Design Change .

80-06, " Replacing Westinghouse BFD Relays in Safety-Related Systems". Unit 2 was completed July 16, 1980 and Unit I was completed May 18, 1981. ,

b. Monthly logic testing in accordance wf'- Technical Specifications is continuing.
c. Relays were replaced in accordance with an approved Design Change, as stated above. Replacement relays were inspected and tested to verify adequate armature overtravel in accordance with approved Special Test 82. Relays which were removed were not tested, but 8407160139 840628 gDRADOCK 0500028

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Vinosura Er.ECTRIC AND Powra COMPANY To Mr. James P. O'Reilly (

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simply removed and replaced. Electrical Maintenance Procedure EMP-C-RT-24 has been revised to include checking armature overtravel when replacing faulty relays. Insufficient overtravel (undertravel) i is basis for rejection of a repl ,,-ment relay.

d. During the course of replacement, 332 Westinghouse BFD relays were tested. Four relays failed to exhibit sufficient contact overtravel as defined by Westinghouse Technical Bulletin NSD-TB-79-05. These relays were removed from stock. Currently, all BFD relays in service in safety-related systems are either coil #1271C50G01 or
  1. 1293C51G01 (later changed for date code verification of relays manufactured after October 29, 1981.

Very truly yours, W. L. Stewart cc: Mr. D. J. Burke NRC Resident Inspector Surry Power Station