05000280/LER-1979-009-01, /01T-0 on 790412:GE Informed Util That Potential Problem Exists in Inside Recirculation Spray Pump Motors.Caused by Possible Overheating of Lower Bearing Due to Clearance Tolerances Allowed on End Shields & Shaft

/01T-0 on 790412:GE Informed Util That Potential Problem Exists in Inside Recirculation Spray Pump Motors.Caused by Possible Overheating of Lower Bearing Due to Clearance Tolerances Allowed on End Shields & Shaft

ML18114A501
Person / Time
Site:	Surry
Issue date:	04/26/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A500	List: 05000280/LER-1979-009, Forwards LER 79-009/01T-0 05000280/LER-1979-009-01, /01T-0 on 790412:GE Informed Util That Potential Problem Exists in Inside Recirculation Spray Pump Motors.Caused by Possible Overheating of Lower Bearing Due to Clearance Tolerances Allowed on End Shields & Shaft
References
LER-79-009-01T, LER-79-9-1T, NUDOCS 7905020519
Download: ML18114A501 (2)

LER-1979-009, /01T-0 on 790412:GE Informed Util That Potential Problem Exists in Inside Recirculation Spray Pump Motors.Caused by Possible Overheating of Lower Bearing Due to Clearance Tolerances Allowed on End Shields & Shaft

Event date:
Report date:
2801979009R01 - NRC Website

text

NRC F:ORM 366 (7-7.7) ~

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!General Electric has informed Vepco that a potential problem may exist in the Inside I

[)):I] I Recirculation Spray Pump motors~

During extended operation the lower bearing could [Q]IJ 1overheat due to clearance tolerances allowed on the end shield, bearings, and shaft.

[))}] I The bearing failure could prevent.the proper functioning of the motor.

This condition I [Q))J I is reportable per Technical Specification 6.6.2.a.(9).

A 100% redundant system was

/I[D !operable, therefore, the health and safety of the general public were not affected.

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!General Electric has indicated that the allowed design clearances could cause the [ID] !problem.

Vepco is in the process of removing the motors for shipment to General Elec-0:::::W ltric for modificatioin to correct the concern.

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W. L. Stewart

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e Virginia Electric and Power Company Surry Power Station, Unit No. 1 & 2 Docket No. 50-280 Report No. LER 79-009/0lT-O Event Date:

04/12/79

Description of Event

e

Attachment:

Page 1 of 1 General Electric has informed Vepco that a potential problem may exist in the Inside Recirculation Spray Pump motors.

Under certain environmental conditions, the lower bearing could overheat due to clearance tolerances allowed on the end shield, bearings, and shaft resulting in bearing size resulting in bearing failure.

This condition is reportable as per Technical Specification 6.6.2.a.(9).

Probable Consequences and Status of Redundant Systems:

In the event of the failure of the Inside Recirculation Spray Pump motors, the Outside Recirculation Spray Pumps could have provided 100% spray capability if required.

The station has periodically tested the inside recirculation spray pumps as per T.S. 4.5.A.3 and no problems have been noticed.

The health and safey of the general public were not affected.

Cause

Overheating could occur if maximum allowable design tolerances were used in fabrication.

Immediate Corrective Action

As a precautionary step, Vepco is in the process of removing the inside recirculating spray pump motors for shipment to General Electric for evaluation and correction.

Scheduled Corrective Action:

The motors will be repaired prior to unit startup.

Action Taken to Prevent Recurrence:

No other action is deemid necessary.

Generic Implic2tions:

This problen should be considered generic to all General Electric motors of this type.