05000265/LER-1979-025-03, /03L-0:on 791026,during Lcpi Motor Operated Valve Operability Test,Motor Control Breaker Tripped on Thermal Overload.Caused by Tripping Circuit Breaker.Motor Meggared

/03L-0:on 791026,during Lcpi Motor Operated Valve Operability Test,Motor Control Breaker Tripped on Thermal Overload.Caused by Tripping Circuit Breaker.Motor Meggared

ML19253C347
Person / Time
Site:	Quad Cities
Issue date:	11/21/1979
From:	Kan S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19253C337	List: 05000265/LER-1979-025, Forwards LER 79-025/03L-0 05000265/LER-1979-025-03, /03L-0:on 791026,during Lcpi Motor Operated Valve Operability Test,Motor Control Breaker Tripped on Thermal Overload.Caused by Tripping Circuit Breaker.Motor Meggared
References
LER-79-025-03L-04, LER-79-25-3L-4, NUDOCS 7911300610
Download: ML19253C347 (1)

LER-1979-025, /03L-0:on 791026,during Lcpi Motor Operated Valve Operability Test,Motor Control Breaker Tripped on Thermal Overload.Caused by Tripping Circuit Breaker.Motor Meggared

Event date:
Report date:
2651979025R03 - NRC Website

text

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8 60 61 DOCKET NUV8E R 63 63 EVENT DATE 14 75 REPORT DATE 60 EVENT DESCRIPTION AND PROBABLE CCNSEQUENCES h o 2 While performina the LCPI Motor Operated Valve 00erability Test. orocecure 005 gl 1000-3. the 2 C RHR pump suction valve, M0 2-1001-7C, motor control breaker tripped i

gl on thermal overload (TS 3.5.B.2).

The valve operability test was being performed I

o 3

l prior to taking the 2A RHF, service water pump out of service for a preventive l

g maintenance outage. The circuit breaker was reset and the valve was successfully l

fiiT 1 i Perated.

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37 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Fi o l The apparent cause of this occurrance is due to the thermal overload tripping the l

gi;3gl circuit breaker. There was no physical damage to the breaker or contactors.

The i

, g valve motor was meggared and the motor currents were measured and found to be l

l normal during valve operations. This valve is normally open and does not have any l

automatic function.

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7 8 9 80 STA S

% POWER OTHER STATUS 15 0 R OISCOVERY DESCRIPTION E l@ l015 14 l@l NA l

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PERSONNE L INJURIES NUMBER

DESCRIPTION

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8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY Q TYPE DE SCRIPTION N/

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NAME OF PREPARER PHONE