05000339/LER-1980-051-03, /03L-0:on 800821,w/unit in Mode 2,C Feedline Containment Isolation Check Valve 2-FW-126 Did Not Meet Post -maint Valve Cycling Test Requirements.Caused by Failure of Valve to Shut Completely Due to Burr on Pivot Pin Bushing

/03L-0:on 800821,w/unit in Mode 2,C Feedline Containment Isolation Check Valve 2-FW-126 Did Not Meet Post -maint Valve Cycling Test Requirements.Caused by Failure of Valve to Shut Completely Due to Burr on Pivot Pin Bushing

ML19338D315
Person / Time
Site:	North Anna
Issue date:	09/16/1980
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D278	List: 05000339/LER-1980-051, Forwards LER 80-051/03L-0 05000339/LER-1980-051-03, /03L-0:on 800821,w/unit in Mode 2,C Feedline Containment Isolation Check Valve 2-FW-126 Did Not Meet Post -maint Valve Cycling Test Requirements.Caused by Failure of Valve to Shut Completely Due to Burr on Pivot Pin Bushing
References
LER-80-051-03L-02, LER-80-51-3L-2, NUDOCS 8009220315
Download: ML19338D315 (3)

LER-1980-051, /03L-0:on 800821,w/unit in Mode 2,C Feedline Containment Isolation Check Valve 2-FW-126 Did Not Meet Post -maint Valve Cycling Test Requirements.Caused by Failure of Valve to Shut Completely Due to Burr on Pivot Pin Bushing

Event date:
Report date:
3391980051R03 - NRC Website

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. LICENSEE EVENT REPORT l CONTROL BLOCE / / / / / / /-(1), (PLEASE' PRINT OR TYPE ALL REQUIRED'INFORMATION)

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i-DOCIET NUMBER EVENT DATE REPORT DATE-

. EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10) i

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On Auaust 28, 1980,- with the Unit in Mode 2, the "C" feedline containment Isol./

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' check valve, 2-FW-126, did not meet the Acceptance Criteria of the post maint- /

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isolation was available from redundant valves via the feedwater isolation'sys- /

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Since the valve had not been operability checked following maintenance,a test /

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j Virginia.ElectricLand Power Company-North Anna Power Station, Unit 2 Attachment: Page 1 of 2

. Docker No. 50-339 Report No. LER 80-051/03L-0 P

Description of Event

_. L0n Augusti 21, 1980; Quality Assurance determined.that the "C"

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feedline containment isolation check valve, 2-FW-126, had not been tested following maintenance..On August 28, 1980, with the anit in mode 2, the subject valve was tested with unsatisfactory results. This-required that the plant be shut down and placed in mode 5sto perform required maintenance on the valve. Upon disassembly of the valve, a burr was found on the pivot pin bushing which prevented the valve ~from closing completely. The component was repaired and the cycling test was 4

. reperformed with acceptable results.

Probable Consequences of Occurrence s=

The feedline check-valves along with other containment isolation valves ensure that the containment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or~ pressurization of the containment. The feedwater isolation valves provide a redundant backup to the feedline check valves in that feedwater is isolated _upon a safety injection signal. High containment pressure will actuate-safety injection which also provides for feedwater isolation. Since feedwater piping design i

pressure is much greater than the containment, it is conservative to assume that the length of piping betssen the feedline check valve and the feedwater isolation valves can maintain integrity above the maximum pressure of the containment. For this reason, the health and safety of the general public were not affected.

Cause of Event

The feedline line check _ valve failed to shut completely due to a burr located on the pivot pin bushing. Maintenance was performed on this valve during construction prior to release of the feedwater system to VEPCO at which time the bushing was damaged.

LImmediate Corrective Action After the valve was-initially tested and failed, the plant entered the action statement of T.S.3.6.3.1 and was in cold shutdown within the required' time period. Maintenance was performed on the valve and the i

valve was retested with satisfactory results.

11 Scheduled Corrective Action A surveillance. test will be performed periodically and upon com-

- s pletion of all maintenance required on the valve.

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Attachment: -Page 2 of 2 Actions Taken to Prevent Reccurrence Scheduled. testing of this valve has been placed on the Periodic 'est Program Log to insure that all required testing is. performed.

Generic Implications

- There are no generic implications.

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