05000281/LER-1981-026-03, /03L-0:on 810429,charging Pump Svc Water Pump 2-SW-P-10A Failed to Operate.Caused by Svc Water Splashing Down Into Motor,Causing Electrical Short & Damaging Windings.Motor Replaced

/03L-0:on 810429,charging Pump Svc Water Pump 2-SW-P-10A Failed to Operate.Caused by Svc Water Splashing Down Into Motor,Causing Electrical Short & Damaging Windings.Motor Replaced

ML18139B330
Person / Time
Site:	Surry
Issue date:	05/22/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B329	List: 05000281/LER-1981-026, Forwards LER 81-026/03L-0 05000281/LER-1981-026-03, /03L-0:on 810429,charging Pump Svc Water Pump 2-SW-P-10A Failed to Operate.Caused by Svc Water Splashing Down Into Motor,Causing Electrical Short & Damaging Windings.Motor Replaced
References
LER-81-026-03L-01, LER-81-26-3L-1, NUDOCS 8105280188
Download: ML18139B330 (2)

LER-1981-026, /03L-0:on 810429,charging Pump Svc Water Pump 2-SW-P-10A Failed to Operate.Caused by Svc Water Splashing Down Into Motor,Causing Electrical Short & Damaging Windings.Motor Replaced

Event date:
Report date:
2811981026R03 - NRC Website

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A unit Rampdown was initiated and the temperature of the affected. systems monitored until the 'B' pump was [ill]

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[)))) ! Water *splashing down into the *motor caused an Electdcal shoif and damaged tbe motor IJJJJ windings.

The check valve for 2-SW-P-lOB,. that had been. removed, was replaced and 2-SW-P-lOB returned t*o* service.

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e ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

81-026/031~0 EVENT DATE:

04-29-81 TITLE OF EVENT:

CHARGING PUMP SERVICE WATER PUMPS INOPERABLE

1.

DESCRIPTION OF EVENT

On April 29,1981, with the unit at 100% power, charging pump service water pump, 2-SW-P-lOB, was removed from service in accordance with Design Change 80-42, Service Water to Control Room and Relay Room Air Conditioning and Charging Pump Coolant Piping Modification.

This* was* done so that a new bronze check valve could be installed.

WFi.en the valve was removed, water splashed down on the redundant pump, 2-SW-P-lOA, causing an electrical short and thereby making 2-SW-P-lOA inoperable.

With both Charging Pump Service Water Pumps inoperable, a Rampdown was immediately initiated.

This event is contrary to T.S. 3.3.A.8.b and is reportable in accordance with T.S. 6.6.2.b(2).

2.

PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

The service water pumps, 2-SW~P-lOA & B, provide cooling water to the charging pump intermediate seal coolers and lubricating oil coolers.

During the period when both pumps'were-inoperable, charging pump temperatures were closely monitored.

There were** no observable increases in charging pump temperatures.

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

3.

CAUSE

Water entering the top of 2-SW-P-lOA, hegause of a missing drip shield, created.an electrical short in. the.motor windings.

4.

IMMEDIATE CORRECTIVE ACTION

The immediate action was to replace the removed check valve and return the redundant pump, 2-SW-P-lOB, to service.

The unit rampdown was terminated 19 minutes after initiation.

5.

SUBSEQUENT CORRECTIVE ACTION:

An operable Service Water Pump was removed from Unit one and installed in place of 2-SW-P-lOA.

6.

ACTION TAKEN TO PREVENT RECURRANCE:

- The missing drip shield has been replaced.

7, GENERIC IMPLICATIONS:

None.