05000280/LER-1980-003-03, /03L-0:on 800107,during Prestartup Testing, Feedwater Bypass Valve HCV-FW-155B Did Not Fail Closed Upon Loss of Instrument Air as Per Design.Caused by Sticking, Dirty Pilot Valve.Valve Cleaned & Returned to Svc

/03L-0:on 800107,during Prestartup Testing, Feedwater Bypass Valve HCV-FW-155B Did Not Fail Closed Upon Loss of Instrument Air as Per Design.Caused by Sticking, Dirty Pilot Valve.Valve Cleaned & Returned to Svc

ML18136A438
Person / Time
Site:	Surry
Issue date:	01/30/1980
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A436	List: 05000280/LER-1980-002-03, /03L-0:on 800106,during Routine Release of Lwtt 80-95,LW Effluent Flow Recorder Paper Did Not Rotate & Thus No Record of Flow Note Was Obtained.Caused by Inadequate Mesh Between Recorder Drive Gears & Recorder Paper Roll 05000280/LER-1980-003-03, /03L-0:on 800107,during Prestartup Testing, Feedwater Bypass Valve HCV-FW-155B Did Not Fail Closed Upon Loss of Instrument Air as Per Design.Caused by Sticking, Dirty Pilot Valve.Valve Cleaned & Returned to Svc ML18136A435
References
LER-80-003-03L, LER-80-3-3L, NUDOCS 8001290210
Download: ML18136A438 (2)

LER-1980-003, /03L-0:on 800107,during Prestartup Testing, Feedwater Bypass Valve HCV-FW-155B Did Not Fail Closed Upon Loss of Instrument Air as Per Design.Caused by Sticking, Dirty Pilot Valve.Valve Cleaned & Returned to Svc

Event date:
Report date:
2801980003R03 - NRC Website

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e ATTACHMENT (PAGE 1 OF 1)

SURRY POWER STATION, UNIT 1 DOCKET NO: 50-280 REPORT NO: 80-003/03L-O EVENT DATE: 1-7-80 TITLE OF REPORT:

Feedwater Bypass Valve Malfunction

1.

DESCRIPTION OF EVENT

e During pre-startup testing, the instrument air supply to the Feedwater Bypass Valve (HCV-FW-155B) was secured.

The valve did not fail closed on loss of air pressure as per design.

This is reportable pursuant to Technical Specification 6.6.2.b.2.

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

Upon safety injection initiation the bypass valves are designed to trip closed, failure to do so could cause excessive cooldown rates until the isolation valves could be closed.

Since the problem was identified prior to startup, the health and safety of the general public were not affected.

3.. CAUSE:

The valve did not close due to a dirty and sticking pilot valve.

4.

IMMEDIATE CORRECTIVE ACTION

The isolation valves for the Feedwater Bypass Valve were immediately closed.

The pilot valve was cleaned and the bypass valve tested operable and returned to service.

5.

SUBSEQUENT CORRECTIVE ACTIONS:

The other two Feedwa ter Bypass Valves were tested and found to operate as re quired.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

None required.

7.

GENERIC IMPLICATIONS:

The other bypass valves were tested with no problems encountered.

Therefore, there are no generic implications.