05000280/LER-1981-063-03, /03L-0:on 811019,charging Pump Svc Water Pump 1-SW-P-10B Found to Have Zero Discharge Pressure Because of Loss of Suction to Pump.Caused by Increased Use of Svc Water by Chillers.Flow to Chillers Throttled

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/03L-0:on 811019,charging Pump Svc Water Pump 1-SW-P-10B Found to Have Zero Discharge Pressure Because of Loss of Suction to Pump.Caused by Increased Use of Svc Water by Chillers.Flow to Chillers Throttled
ML20005C095
Person / Time
Site: Surry 
Issue date: 10/06/1981
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005C080 List:
References
LER-81-063-03L-03, LER-81-63-3L-3, NUDOCS 8111180382
Download: ML20005C095 (2)
v • d • e


LER-1981-063, /03L-0:on 811019,charging Pump Svc Water Pump 1-SW-P-10B Found to Have Zero Discharge Pressure Because of Loss of Suction to Pump.Caused by Increased Use of Svc Water by Chillers.Flow to Chillers Throttled
Event date:
Report date:
2801981063R03 - NRC Website
v • d • e

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tmene p,,,,p 1-SW-P-10B was found to have zero discharge pressure as a result of loss of suction to the pump.

Inoperability of this pump is contrary to T.S.3.3. A.8.b and is reportab1d per T. S. 6.6.2.b. (2).

Since the redundant pump remained operable, the health and I

safety of the public were not affected.

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ATTACHMENT 1 SURRY POWER STATION, UNIT 1 DOCKEI NO:

50-280 REPORT NO:

81-063/03L-0 EVEhT DATE:

10-19-81 TITLE OF THE EVENT:

1-SW-P-10B LOW DISCFARGE PRESSURE 1.

DESCRIITION OF EVENT:

On October 19,1981, it was discovered that charging pump service water pump, 1-SW-P-10A, had zero discharge pressure. The pump was declared inoperable, whit.h is a condition contrary to Technical Specification 3.3.A.8.b. and reportable per Technical Specification 6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES O?yOCCURRENCE:

The charging pump service water pumps supply water to the charging pump intermediate seal coolers and the charging p2mp lubricating oil coolers.

During the event, the redundant charging pump service water pump remained operable; therefore, the health and safety of the public were not affected.

3.

CAUSE OF EVENT

The service water piping for the charging pump service water pumps also supplies the Control Room / Relay Room air conditioner chiller units.

Increased flow to the chillers can cause a loss of suction flow to the charging pump service water pumps. Recent modifications attempted to resolve these problems.

Installation and testing, completed in early spring, indicated satisfactorn performance; however, an intermittent problem is now indicated.

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IMMEDIATE CORRECTIVE ACTION

4 The immediate corrective action was to check the suction strainer to the affected pump for possible blockage. When no blockage was found, the operators tried venting the pump and discovered that no water was in the suction line.

5.

SUBSEQUENT CORRECTIVE ACT g The subsequent corrective action was to throttle service water flow to the chiller units which resulted in flooding the suction line to the affected charging pump service water pump.

6.

ACTIONS TAKEN TO PREVENT RECURRENC3 i

An Engineering Study is being performed to investigate this on-going problem and propose a solution.

4 7.

OENERIC IMPLICATIONS:

Related occurrences have been reported on I,ER's81-037 and 81-063 for unit 1, and 81-055,81-060 and 81-064 for unit 2.

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