ML19312E679

Updated LER 80-022/03X-1: on 800506,while Performing Testing on Steam Driven Emergency Feedwater pump,2P7A,pump Tripped Three Times Due to Overspeed.Caused by Mechanical Adjustments to Pump & Driver Controller.Reduced Idle Speed

ML19312E679
Person / Time
Site:	Arkansas Nuclear
Issue date:	06/02/1980
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19312E675	List: ML19312E674 ML19312E679
References
LER-80-022-03X, LER-80-22-3X, NUDOCS 8006090394
Download: ML19312E679 (2)

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UPDATE REPORT -

PREVIOUS REPORT DATE 1/29/80  ;

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EVENT DESCAIPTION AND PROBA0LE CONSEQUENCES h o 2 l During Mode 1 operation, while performing testina on the steam driven i j goi3i i emergency feedwater pump (2P7A), the pump tripped three (3) times in i j o . i succession due to overspeed. 2P7B, the electric pump, was verified i o s i operable. This occurrence is similar to LER's 50-368/79-055,79-072, I lo is i l 79-081, and 79-104. Reportable per Tech Spec 6.9.1.9.b. i

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, o l Investigation revealed the cause of overspeed trips were due to mechanical li lil I adjustments to the pump and turbine driver controller. See the attachment

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r Attachment to LER 50-368/80-022 Rev 1 The following corrective actions were taken to prevent an overspeed trip recurrence on the steam driven emergency feedwater pump (2P7A).

1. Governor valve travel has been reduced from 7/8 of an inch to 5/8 inch per Terry Turbine recommendations.

2. The idle speed for the turbine has been reduced from 1100 rpm to 800 rpm.

3. The initiation point for the ramp signal has been' delayed by 6 seconds.

Following the above adjustments to the controls for 2P7A, a surveil-lance test schedule was set up to test the pump for reliability. The test sequence involved restarting the pump after a successful start at the follcwing intervals: I hour, 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, 12 .

hours , 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> , 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, I week, 2 weeks, 1 month. After the 1 month start interval, the monthly surveillances testing would keep the pump testing on a monthly basis.

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