05000280/LER-1981-050-03, /03L-0:on 810804,during Routine Walkdown,Oil Discovered Being Slung from Outboard Bearing of Charging Pump A.Caused by Tube Leak in Pump Lube Oil Cooler Which Admitted Water to Lube Oil,Causing Seal Failure

/03L-0:on 810804,during Routine Walkdown,Oil Discovered Being Slung from Outboard Bearing of Charging Pump A.Caused by Tube Leak in Pump Lube Oil Cooler Which Admitted Water to Lube Oil,Causing Seal Failure

ML20010F114
Person / Time
Site:	Surry
Issue date:	09/01/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F102	List: 05000280/LER-1981-025, Forwards Updated LER 81-025/01X-1 & LERs 81-037/03L-0, 81-050/03L-0 & 81-051/03L-0 05000280/LER-1981-037-03, /03L-0:on 810806,charging Pump Svc Water Pumps 1-SW-P-10A & B Found to Have Zero Discharge Pressure Due to Loss of Suction to Pumps.Caused by Increased Use of Svc Water by Chillers During Summer Months.Strainers Cleaned 05000280/LER-1981-050-03, /03L-0:on 810804,during Routine Walkdown,Oil Discovered Being Slung from Outboard Bearing of Charging Pump A.Caused by Tube Leak in Pump Lube Oil Cooler Which Admitted Water to Lube Oil,Causing Seal Failure 05000280/LER-1981-051-03, /03L-0:on 810804,both Charging Pump Svc Water Pumps 2-SW-P-10A & B Lost Suction & Were Secured W/Unit at 100% Power.Caused by Increased Use of Svc Water by Chillers Causing Loss of Suction Pressure
References
LER-81-050-03L-01, NUDOCS 8109090383
Download: ML20010F114 (2)

LER-1981-050, /03L-0:on 810804,during Routine Walkdown,Oil Discovered Being Slung from Outboard Bearing of Charging Pump A.Caused by Tube Leak in Pump Lube Oil Cooler Which Admitted Water to Lube Oil,Causing Seal Failure

Event date:
Report date:
2801981050R03 - NRC Website

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a CAU0E DESCRIPTION AND CORRECTIVE ACTIONS i 101 I A tube leak in the charging pump lube cil cooler admitted water to the lube oil which I sa1 1!

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i i: t I operation and "A" removed from service. The "C" pump, which had a minor seal leak, t'

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50-281 REPORT 1:0:

81-050/03L-0 D'E!.T DATE:

08-04-81 TITLE OF THE EQT:

2-CH-P-1 A INOPERABLE 1.

EVENT DESCRIPTION

With the unit at full power, "C" charging pump out of service for minor maintenance, and "A" charging pump in operation, it was discovered during a routine walkdown that oil was being slung from the outboari becting of the "A" pump. The "B" charging pump was started and "A" was removed from service leaving only one pump operational. This eve.nt is contrary to T.S.-3.2.C.1 and is reportable per T.S.-6.6.2.b(2).

2.

, PROBABLE CONSEQUENCES:

The charging pumps supply makeup water to the reactor coolant system, RCP seal injection, as well as high head safety injection. One pump,_however, is sufficient to supply 1007. of the charging and high head safety injection require-ments.

In accordance with T.S.-3.3.B.2, two pumps were operable within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; therefore, the health and safety of the public vere not affected.

3.

CAUSE

The "A" charging pump was declared inoperable when it was found to be slinging oil from its outboard bearing. This was a result of the failure of the bearing seal as result of water in the lube oil. The water entrained in the lube oil originated from a tube failure in the charging pump lube oil cooler.

4.

IFDfEDIATE CORRECTIVE ACTION:

The immediate corrective action was to start the "B" charging pump and immediately begin corrective maintenance on the "C" charging pump.

5.

SUBSEQUENT CORRECTIVE ACTION:

The "C" charging pump, which had a minor seal leak, was returned to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The "A" charging pump bearing seal & lube oil coolsr were substquently repaired 6 the pump returned to service.

6.

ACTION TAKEN TO PREVEhT R_ECURRENCE:

None deemed necessary.

7.

GENERIC IMPLICATIONS:

None.

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