05000281/LER-1981-041-03, /03L-0:on 810626,discovered That Recirculation Spray HX Svc Water Radiation Monitoring Pump Would Not Operate.Caused by Hardened Sediment on Pump Internals Which Prevented Pump from Rotating.Pump Cleaned & Adjusted

/03L-0:on 810626,discovered That Recirculation Spray HX Svc Water Radiation Monitoring Pump Would Not Operate.Caused by Hardened Sediment on Pump Internals Which Prevented Pump from Rotating.Pump Cleaned & Adjusted

ML20009F958
Person / Time
Site:	Surry
Issue date:	07/24/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F945	List: 05000281/LER-1981-040-03, /03L-0:on 810626,boric Acid Storage Tank a Overflowed Into Boric Acid Storage Tank C,Diluting Tank C Below Tech Spec Limits.Caused by Inadvertent Alignment of Primary Grade Water to Suction of Boric Acid Transfer Pump 05000281/LER-1981-041-03, /03L-0:on 810626,discovered That Recirculation Spray HX Svc Water Radiation Monitoring Pump Would Not Operate.Caused by Hardened Sediment on Pump Internals Which Prevented Pump from Rotating.Pump Cleaned & Adjusted ML20009F943
References
LER-81-041-03L-01, LER-81-41-3L-1, NUDOCS 8108030195
Download: ML20009F958 (2)

LER-1981-041, /03L-0:on 810626,discovered That Recirculation Spray HX Svc Water Radiation Monitoring Pump Would Not Operate.Caused by Hardened Sediment on Pump Internals Which Prevented Pump from Rotating.Pump Cleaned & Adjusted

Event date:
Report date:
2811981041R03 - NRC Website

text

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service water radiation monitoring pump 2-SW-P-6B would not. operate. This is l

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

50-281 I

REPORT NO:

81-041 03L-0 EVENT DATE:

06-28-d1 IN0PERABLE SERV ICE " WATER PUMP 1.

DESCRIPTION OF EVENT

With Unit 2 at 100% power, an attempt was made to start 2-SW-P-5B (Inside recirculation spray service water radiation monitoring puso) to compare its operation to 2-SW-P-5A which was undergoing preventative maintenance.

It was discovered that 2-SW-P-5B would not operett. This event is contrary to T.S.-3.4.2.A.2 and is reportable par T.S.-6.6.2.b(2).

2.

PROBABLE CONSEQUENCES:

Pump 2-5W-P-5B takes suction f rom the service water discharge of one of the four recirculation spray heat exchangers.

Failure of 2-SW-P-5B would not affect performance of its associated heat exchanger.

In addition, the discharge tunnel radiation monitor provides backup radiation monitoring capability; therefore, the health and safety of the public were not affected.

3

CAUSE

The pump would not operate because sediment form the service water had dried and hardened on the pump internals, preventing the pump from rotating.

4.

IMMEDIATE CORRECTIVE ACTION

The immediste corrective action was to declare the pump inoperable _and initiate a maintenam.e request.

5 SUBSEQUENT CORRECTIVE ACTION:

The failed pump was cleaned, readjusted, and then tested and verified to operate.

6.

ACTION TO PREVENT OCCURRENCE:

As a result of Design Change 80-56, currently underway, piping for the re-circulation spray heat exchanger radiation monitors is being changed, wich will provide a means for flushing the radiation monitor pumps. This should prevent buildup of material in the pump.

7 GENERIC IMPLICATIONS:

The modifications described in Section 6 will also be implemented on Unit 1.