ML19317F971

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AO-75-10:on 750519,auxiliary Feedwater Pump Stopped During Surveillance Test.Caused by Overcurrent Tripping Pump Motor. Relay Coil Not Secured,Lock Nut Loose & Time Relay Setpoint Drifted.Preventive Maint Procedures Implemented
ML19317F971
Person / Time
Site: Rancho Seco
Issue date: 06/18/1975
From: Colombo R
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML19317F835 List:
References
NUDOCS 8002210676
Download: ML19317F971 (1)


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57 58 59 60 61 68 69 74 75 60 EVENT DESCRIPTION

] l During a surveillance test of one of two auxiliary feedwater pumps (P-318) the pump l

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80 89 "Til l are being implemented-to test trip setpoints at all Class I equipment.

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47 48 CAUSE DESCRIPTION A check of the circuit revealed tha't the l y lThe pump motor was tripping on overcurrent.

eo 89 3 lovercurrent Ich relay coil was not secured, the lock nut was loose, and the time delay l 80 89.lovercurrent trip setpoint had drifted to 21 amps from the original 23 amp settinc.

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60 89 LOSS OR CAMAGE TO FAC!UTY TYPE DESCRpf0N l

3 l_Z_j l NA 80 89 10 PUGUCITY T) 'l " Sacramento Bee" and " Union" notified on May 23, 1975.

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ADOITIONAL FACTORS i]The motor current operated at the trip setpoint long..cnough to give the trip.

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00 89 (916) 452-3211 NAME: R. 11 Colombo PHONE:

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