05000280/LER-1978-030-03, /03L-0 on 781009:w/unit at Rated Pwr,Charging Pump Component Cooling Water Pump Btripped.Pump Tripped on Overcurrent.Caused by Corrosion Damage to Motor Bearings. Pump & Motor Rebuilt & Reinstalled

/03L-0 on 781009:w/unit at Rated Pwr,Charging Pump Component Cooling Water Pump Btripped.Pump Tripped on Overcurrent.Caused by Corrosion Damage to Motor Bearings. Pump & Motor Rebuilt & Reinstalled

ML18113A602
Person / Time
Site:	Surry
Issue date:	11/09/1978
From:	Baucom T VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18113A601	List: 05000280/LER-1978-030, Forwards LER 78-030/03L-0, 78-031/03L-0, 78-032/03L-0, 78-033/03L-0 05000280/LER-1978-030-03, /03L-0 on 781009:w/unit at Rated Pwr,Charging Pump Component Cooling Water Pump Btripped.Pump Tripped on Overcurrent.Caused by Corrosion Damage to Motor Bearings. Pump & Motor Rebuilt & Reinstalled 05000280/LER-1978-032-03, /03L-0 on 781011:heat Tracing Circuit Faults Had Occurred as a Result of Boric Acid Incursion.Faults Repaired & Circuit Current Verified 05000280/LER-1978-033-03, /03L-0 on 781015:heat Tracing Circuit Failed. Caused by Old Boric Acid Buildup & Penetration of Heat Leakage
References
LER-78-030-03L-01, LER-78-30-3L-1, NUDOCS 7811090210
Download: ML18113A602 (2)

LER-1978-030, /03L-0 on 781009:w/unit at Rated Pwr,Charging Pump Component Cooling Water Pump Btripped.Pump Tripped on Overcurrent.Caused by Corrosion Damage to Motor Bearings. Pump & Motor Rebuilt & Reinstalled

Event date:
Report date:
2801978030R03 - NRC Website

text

NRC FORM366 17-7,7).

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE SO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

[TID J With the unit at rated power, Charging Pump Component Cooling Water Pump "B" tripped.

CI:I[J The redundant pump was placed in operation.

This event constitutes a degraded mode Io j 4 ] I of operation permitted by T.S. 3.3.B.6 and is reportable in accordance with

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~S. 6.6.2.b.(2).

The health and safety of the public were not affected.

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CODE

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44 47 l 1 jo I JThe pump trip?cd o~ overcurrent resulting from corrosion damage to the motor bearings. I I 1 j1j !The motor 2-:::.c ?"U3? wer~ rebuilt and reinstalled.

Subsequent operation was satis-11 121 factory.

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(Attachment, Page 1 of~

Surry Power Docket No:

Report No:

Event Date:

Station, Unit 1 50-280 78-030/03L-0 10-9-78 Title of Report:

Charging Pump Component Cooling Water Pump Out of Service

1.

Description of Event

With the unit at rated power, Charging Pump Component Cooling Water Pump (l-CC-P-2B) tripped on overload.

The redundant pump in the system was placed in operation.

This event constitutes a degraded ~ode of operation permitted by Technical Specifications 3.3.B.6 and is reportable in accordance with Technical Specification 6.6.2.b.(2).

2.

Probable Consequences and Status of Redundant Systems:

Each Charging Pump Component handle full heat removal capacity.

Pump is required during operation.

in an operable standby condition.

this system, the health and safety reduced or adversely affected.

3.

Cause

Cooling Water Pump is designed to Only one Component Cooling Water The other full capacity pump remains Due to the 100 percent redundancy of of the general public was not The pump triped due to overload of the motor in operation.

The overload was the result of corrosion damage to the motor bearings caused by water leakage from the pump seal.

4.

I~eci~te Corrective Action:

The reduncL:ont pump was started.

The failed pump was removed and dis~3se:;ibled £or repair.

The motor bearings were replaced and the pump reb~~~t with ne~ seal material and new gaskets.

The rebuilt pump was reiI:Et~lled 2J.a tested satisfactorily.

5.

Su~~=G~e~t Cc~~ective Action:

~ollowing reinstallation, no further repairs or adjustments were necessary.

6.

Action Taken to Prevent Recurrence:

None required.

This was a random failure.

7.

Generic Implications:

None.