05000280/LER-1981-053-03, /03L-0:on 810816,shaft of Standby Pump 2-SW-P-10B Found to Be Rotating Backwards Due to Failure of Check Valve L-SW-108 to Seat Properly.Caused by Wear Resulting in Excessive Play & Binding in Disc

/03L-0:on 810816,shaft of Standby Pump 2-SW-P-10B Found to Be Rotating Backwards Due to Failure of Check Valve L-SW-108 to Seat Properly.Caused by Wear Resulting in Excessive Play & Binding in Disc

ML20010H234
Person / Time
Site:	Surry
Issue date:	09/15/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H231	List: 05000280/LER-1981-053-03, /03L-0:on 810816,shaft of Standby Pump 2-SW-P-10B Found to Be Rotating Backwards Due to Failure of Check Valve L-SW-108 to Seat Properly.Caused by Wear Resulting in Excessive Play & Binding in Disc ML20010H230
References
LER-81-053-03L-01, LER-81-53-3L-1, NUDOCS 8109240248
Download: ML20010H234 (2)

LER-1981-053, /03L-0:on 810816,shaft of Standby Pump 2-SW-P-10B Found to Be Rotating Backwards Due to Failure of Check Valve L-SW-108 to Seat Properly.Caused by Wear Resulting in Excessive Play & Binding in Disc

Event date:
Report date:
2801981053R03 - NRC Website

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ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

81-053/03L-0 EVENT DATE:

08-16-81 TITLE OF THE EVENT:

CHECK VALVE 2-SW-108 FAILURE 1.

DESCRIPTION OF EVENT

With Unit 2 at 100% power, during the performance of planned weekly maintenance on the charging pump service water pump suction strainers, the shaf t of standby pump 2-SW-P-10B was noted to be rotating backwards. To investigate the cause, it was necessary to isolate pump 2-SW-P-10B.

The reverse flow was discovered to be the result of check valve 2-SW-108 failing to seat properly.

Isolation of pump 2-SW-P-10B is contrary to T.S.-3.3. A.8.b, and reportable per T.S.-6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EOUIPMENT:

The charging pump service water pumps supply cooling water-to the charging pump intermediate seal and lube oil coolers. With pump 2-SW-P-10B isolated, 2-SU-P-10A was operating and performing its intended function. Therefore, the. health and safety of the public were not affected.

CAUSE

Investigation revealed the cause of the check valve failure to be excessive play in the valve disc as a result of wear. The excessive play caused the disc to bind and not seat properly.

4.

IMMEDIATE CORRECTIVE ACTION

The check valve was isolated and repaired. Pump 2-SU-P-lob waa then returned to standby service.

5.

SUBSEQUENT CORRECTIVE ACTION:

None required.

6.

ACTIONS TAKEN TO PREVENT RECURRENCE:

Two replacement valves have been ordered in anticipation of approaching valve end of life.

7.

GENERIC IMPLICATIONS:

None.