05000280/LER-1982-049, Updated LER 82-049/03X-1:on 820419,at 100% Power,Charging Pump Svc Water Pump 1-SW-P 10B Found W/Zero Discharge Pressure.Caused by Loss of Suction to Pumps Due to Increased Use of Svc Water by Chillers.Pump Operation Restored

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Updated LER 82-049/03X-1:on 820419,at 100% Power,Charging Pump Svc Water Pump 1-SW-P 10B Found W/Zero Discharge Pressure.Caused by Loss of Suction to Pumps Due to Increased Use of Svc Water by Chillers.Pump Operation Restored
ML20062F698
Person / Time
Site: Surry Dominion icon.png
Issue date: 08/03/1982
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20062F679 List:
References
LER-82-049-03X, LER-82-49-3X, NUDOCS 8208120116
Download: ML20062F698 (2)
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LER-2082-049, Updated LER 82-049/03X-1:on 820419,at 100% Power,Charging Pump Svc Water Pump 1-SW-P 10B Found W/Zero Discharge Pressure.Caused by Loss of Suction to Pumps Due to Increased Use of Svc Water by Chillers.Pump Operation Restored
Event date:
Report date:
2802082049R00 - NRC Website
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text

3 UPDATE REPORT - PREVIOUS REPORT DATE 05-14-82 NRC F ors,1366 U. S. NUCLEAR REGULATORY COMMtsstoh a.m LICENSEE EVENT REPORT -

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lc :t i On 04-19-82 with the unit at 1007 power. charcine nunn s e rvi c e un t e r on.,, l_,

[os3i l 1-SWP 10B was found to have zero discharge pressure as a result of loss of I 1064 l l suct ion t o t he pump. Inoperability of this nunn i s con t ra rv t o T <: _1_ "L A . R _ b nnd l

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CAUSE DESCRIPTION AND CCARECTIVE ACTIONS h l3 jol l Increased use of service water by the chillers can cause a loss of suction to the 1 ii ii l l rharcing pump service water pumps. The Control Foom Chiller van secured ubich I

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.' UPDATE REPORT - PREVIOUS REPORT DATE 05/14/82 ATTACHMENT 1 SURRY POWER STATION, UNIT NO. 1 DOCKET NO: 50-280 REPORT NO: 82-049/03X-1 EVENT DATE: 04-19-82 TITLE OF Tile EVENT: 1-SW-P-10B Low Discharge Pressure

1. DESCRIPTION OF EVENT:

On April 19, 1982, with the unit at 100% power, it was discovered that charging pump service water pump,1-SW-P-10B had zero discharge pressure.

The pump was declared inoperable, which is contrary to Technical Specification 3.3.A.8.b and reportable per Technical Specification 6.6.2.b(2).

2. PROBABLE CONSEQUENCES OF OCCURRENCE: ,

The charging pump service water pumps supply water to the charging pump intermediate seal coolers and the charging pump 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 af fected.

3. CAUSE OF EVENT:

The service water piping for the charging pump service 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 pumps service water pumps. Recent modifications attempted to resolve these p roble ms. Installation and testing, completed last year indicated satisfactory performance ; however, an intermittent problem is now indicated.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate corrective action was to check the suction strainer to the af fected 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 ACTION:

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The subsequent corrective action.was to secure the Control Room Chiller

! and it's service water which resulted in flooding the suction line to the af fected charging pump service water pump.

6. ACTIONS TAKEN TO PREVENT RECURRENCE:

Design work is in progress to resolve this on-going problem. Subsequent to this event, c1 caning and flushing of these suction lines was completed.

7. Gl:NERIC IMPLICATIONS:

i l Related occurrences have been reported on LER's81-037, 81-063 and 82-034 i for unit 1, and 81-051,81-060 and 81-064 for unit 2.

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