05000281/LER-1980-037-03, /03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line

/03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line

ML18139A886
Person / Time
Site:	Surry
Issue date:	12/05/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A885	List: 05000281/LER-1980-037-03, /03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line 05000281/LER-1980-038-03, /03L-0:on 801105,on-svc Boric Acid Storage Tank & Boron Injection Tank Concentration Found Less That 11.5%. Caused by Improper Valve Lineup.Boric Acid Concentration Increased ML18139A884
References
LER-80-037-03L-01, LER-80-37-3L-1, NUDOCS 8012110393
Download: ML18139A886 (2)

LER-1980-037, /03L-0:on 801105,high Temp on Charge Pump a (2-CH-P-1A) Revealed Low Svc Water Flow.Low Discharge Pressure Alarm Failed to Annunciate.Caused by Clogged Pump Inlet Strainer & Clogged Pressure Switch Sensing Line

Event date:
Report date:
2811980037R03 - NRC Website

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I With the unit at 100%, a high temperature on 'A' Chg. Pump (2-CH-P-lA) revealed a low*

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• :III[] )A clogged pump inlet strainer caused the low discharge pressure and a clogged pressure [I]JJ 1switch sensing line prevented the alarm from annunciating.

The strainer was cleaned and o::I1J 1-the sensing line was purged.

Both were tested and returned to service.

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e ATTACHMENT 1 (PAGE 1 OF 1)

SURRY POWER STATION, UNIT 2 DOCKET NO:

50-281 REPORT NO:

80-037/03L-0 EVENT DATE:

11-05-80 TITLE OF REPORT:

LOW DISCHARGE PRESSURE ON 2-SW-P-lOB 1,

EVENT DESCRIPTION

2.

Upon investigation of a high temperature on charging pump 2-CH-P-lA, FI-SW-201A (charging pump lube oil cooler flow indicator) and FI-SW-201B (charging pump intermediate seal cooler flow indicator) indicated a reduced flow.

Service Water Pump 2-SW-P-lOB indicated a low discharge pressure of 10 PSIG.

The low discharge pressure switch sensing line was clogged.

This is contrary to T.S. 3.3.B.8.b and is reportable per T.S. 6.6.2.b.(2).

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The Charging Pump Service Water Subsystem provides cooling for the charging pump lube oil and intermediate seal coolers.

The redundant pump, 2-SW-P-lOA, was operable and performed its intended function.

The charging pump temperatures returned to normal.

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

3.

CAUSE

The cause of the low discharge pressure was a clogged pump suction strainer.

The cause of the failure of low discharge pressure alarm to annunciate was a clogged sensing line.

4.

IMMEDIATE CORRECTIVE ACTION

5.

The redundant pump, 2-SW-P-lOA, was started and verified, providing the required pressure and flow.

SUBSEQUENT CORRECTIVE ACTION:

Cleaned suction strainer in inlet to pump 2-SW-P-lOB.

Restarted the pump, and verified that it was operable. Also, cleaned the sensing line for the discharge pressure switch.

6.

ACTIONS TAKEN TO PREVENT RECURRENCE:

A design change is in progress, as a result of the pipe stress analysis program.

Piping rearrangement and system changes specified in the design change will improve the flow capabilities of the system.

7.

GENERIC IMPLICATIONS:

Any changes would be applicable to both units.

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