ML18139A767

LER 80-028/03L-0:on 800926,w/unit at 100% Power,Reduction in Svc Water Pressure to Charging Pumps Experienced.Caused by Missing Valve Disk for Check Valve 2-SW-112.Valve Replaced

ML18139A767
Person / Time
Site:	Surry
Issue date:	10/24/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A766	List: ML18139A765 ML18139A767
References
LER-80-028-03L-01, LER-80-28-3L-1, NUDOCS 8010280512
Download: ML18139A767 (2)

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I On September 26, 1980, with the unit at 100% power, a reduction in service water

~\pressure to the charging prnnps was experienced. Investigation indicated a missing (Iill check valve disk for 2-SW-113, on the discharge of 2-SW-P-lOA. If the pump had not been!

C£:II) isolated, a reduction in cooling water flow would have occurred. This is contrary to

[§JI] I T.S.3.3.A.8.b and is reportable per T.S.6.6.2.b.(2). The temporary modification

~ \ (missing disk) was not documented. This is contrary to T.S.6.4.D and is reportable

~ I per T.S.6.6.2.b(3). The health and safety of the public were not affected.

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\ The cause of the event was a missing valve disk for 2-SW-113. The "A"** pump was

[IID I isoJ ated thereby allowing the "B" pump to perform its intended function. The check CIII] I valve, 2-SW-113, was subsequently replaced.

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e e ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO: 50-281 REPORT NO: 80-028/031-0 EVENT DATE: 09-26-80 TITLE OF REPORT: INOPERABLE CHECK V~VE 2-SW-113

1. Description of Event:

On September 26, 1980, with the unit operating a steady state power level of 100%, a reduction in service water pressure to the charging pumps was experienced. This reduced pressure .condition existed only when 2-SW-P-lOB was operating. Subsequent troubleshooting indicated that the discharge check valve, 2-SW-113, on the non-operating redundant pump (2-SW-P-lOA) was open. This is contrary to Technical Specification 3.3.A.8.b and is re-portable .per Technical Specification 6. 6. 2. b (2).. While investigating the event, it became apparent that 2-SW-P-lOB may have been operated in .degraded mode without prcrper administrative*measures in place. Specifically, the internals for check valve 2-SW-113.,were removed and documentation o.f this temporary modification was not performed. This is contrary to Technical Specification 6.4.D and is repo*rtable per Technical Specification 6.6.2.b(3).

When this modification was performed,. cannot be determined. However, both pumps were proven operable, utilizing PT-18.8, on September 6, 1980.

2. Probable Consequences and Status of Redundant Equipment:

The charging pump service water pumps supply cooling water to the charging pump intermediate seal and lube oil coolers. With the "A" pump's discharge isolated, 2-SW-P-lOB was operable and was performing its intended function.

Therefore, the health and safety of the public were not affected.

3. Cause of Occurrence:

The cause of the event was a missing valve disk for 2-SW-113. Investigation revealed that the valve disk was removed during a previous maintenance activity.

Documentation of the previous maintenance was not performed.

4. Immediate Corrective Action:

The immediate corrective action was to close the discharge valve for pump "A".

This allowed 2-SW-P-lOB to function as designed. A maintenance request was issued to repair 2-SW-113.

5. Subsequent Corrective Action:

Check valve 2-SW-113 was replaced and tested.

6.

• Actions Taken To Prevent Reccurrence:

Operation and maintenance personnel have been reinstructed in the proper *method of performance of work on Safety-Related systems.

7. Generic Implications:

None