05000346/LER-1979-124-03, /03L-0:on 791208,component Cooling Water Pump 1 Would Not Start.Caused by Failure of Breaker AC113 on Essential Switchgear Bus C1 to Close.Breaker Replaced & Pump Returned to Svc

/03L-0:on 791208,component Cooling Water Pump 1 Would Not Start.Caused by Failure of Breaker AC113 on Essential Switchgear Bus C1 to Close.Breaker Replaced & Pump Returned to Svc

ML19290C326
Person / Time
Site:	Davis Besse
Issue date:	01/05/1980
From:	Rudolph J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19290C322	List: 05000346/LER-1979-124, Forwards LER 79-124/03L-0 05000346/LER-1979-124-03, /03L-0:on 791208,component Cooling Water Pump 1 Would Not Start.Caused by Failure of Breaker AC113 on Essential Switchgear Bus C1 to Close.Breaker Replaced & Pump Returned to Svc
References
LER-79-124-03L, LER-79-124-3L, NUDOCS 8001100532
Download: ML19290C326 (2)

LER-1979-124, /03L-0:on 791208,component Cooling Water Pump 1 Would Not Start.Caused by Failure of Breaker AC113 on Essential Switchgear Bus C1 to Close.Breaker Replaced & Pump Returned to Svc

Event date:
Report date:
3461979124R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COMMISSION NRC FORM 36G (7-77)

LICENSEE EVENT REPORT CONT ROL e' OCK:

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h On December 6,1979 operations personnel atter pted to start Component Cooling Water j

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) (CCW) Pump #1 for routine pump switching. The pump would not start from the Control l

o jRoom. The pump was declared inoperable at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8, 1979. This occury o

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l health and saf ety of the public or station personnel. CCW Pumps #2 and #3 were o

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33 35 36 31 40 41 42 43 44 41 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lThe cause of the occurrence was the f ailure of breaker AC113 on essential switchgear i

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]i ji j bus "C1" to close. The breaker was removed from the cubicle and a spare was installed) jand the #1 CCW Pump was returned to service on December 15, 1979. The cause of the j

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-144 DATE OF E.ENT: December 8, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The #1 Component Cooling Water Pump was declared inoperable The unit was in Mode 5, with Power (MWT) = 0, and Conditions Prior to occurrence:

Load (Gross MWE) = 0.

Description of Occurrence: On December 6, 1979, operations personnel attempted to When the start Component Cooling Water (CCW) Pump fl for routine pump switching.

pump did not start from the Control Room, maintenance and instrument and control pet sonnel were called in for investigation.

The investigation found that the breaker was the cause of the problem, and the pump was declared inoperable at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on December 8,1979.

This accurrence is being reported to dccument a component failure. Technical Speci-fication 3.7.3.1 requires two independent CCW loops to be operable in Modes 1 through 4.

Since the plant was in Mode 5, and CCW Pumps #2 and #3 were operable, no action statement was entered.

Designation of Apparent Cause of Occurrence:

The apparent cause of the occurrence was the failure of breaker AC113 on essential switchgear bus "Cl" to close. The cause of the failure 1, still being investigated.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The subject pump is redundant in the CCW System. CCU Pumps

1. 2 and #3 were availabic for service at this time.

The breaker was removed from the cubicle and.a spare was installed

Corrective Action

on December 15, 1979 under Maintenance Work Order (MWO) 79-3723 and the #1 CCW Pump was returned to service on December 15, 1979. The cause of the breaker failure is presently being investigated under the same MWO.

Failure Data: There have been no previous similar reportable occurrences.

LER #79-124 1727 113