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

/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

ML20010F121
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-81-051-03L-02, LER-81-51-3L-2, NUDOCS 8109090391
Download: ML20010F121 (2)

LER-1981-051, /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

Event date:
Report date:
2801981051R03 - NRC Website

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- ATTACHMEhT I SURRY-POWER STATION,' UNIT'2 DOCKET No:

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'81-051/03L-0

' EVENT.DATE:

08-04-81 TITLE 0F THE EVENT:

SERVICE WATER PUMP, SW-P-10A, & 3, LOSS OF SUCTION 1.

DESCRIPTION OF EVENT

l With the unit at 100% power the service water pump, 2-SW-P-10A, started in automatic. The discharge -pressure was normal, however, the pump.

continued to run when placed in auto.

Shortly thereafter both pumps lost suction and were secured. One controi room chiller,1-VS-E-4A, was secured to increase the available service water and the "A" pump restarted.

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 CONSEOUENCES AND STATUS OF REDUNDANT EQUIPMENT:

The charging pump service water pumps supply cooling water to the charging pump intermediate seal oil coolers and the charging pump lubricating oil coolers. During the short period when these pumps were inoperable (8 minutes) the charging pump temperature did not increase appreciably. Since the pumps were restored to service within the time limit of T.S.-3.0.1, the health and safety of the public were not affected.

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3.

CAUSE

The service water piping for the charging pump service water pumps also i

supplies the Control Room / Relay Room air conditioner chiller units.3-VS-E-4A, B, and C.

During the summer months the increased use of service water by the chillers can cause a loss of suction pressere to the charging pump service l

water pumps. Recent modifications (DC 80-42) attempted to resolve the NPSH problems for the service water system.

Installation and Testing, completed in early spring, indicated satisfactory performance; however, an intermittent-j problem is now indicated.

i 4.

IMMEDIATE CORRECTIVE ACTION

The service water to the chillers was throttled to increase the flow to the charging pump service water pumps.

l' 5.

SUBSEQUENT CORRECTIVE ACTION:

None taken.

6.

ACTION TAKEN TO PREVENT RECURRANCE:

- Further evaluation will be conducted to determine if additional modifications are required to resolve the marginal NPSH Conditions.

7.-

GENERIC IMPLICATIONS:

This is generic to both units. A related occurrence is reported on LER 80-037 for unit 1.