05000346/LER-1979-110-03, /03L-0:on 791112,while Testing HPI Pump 1-1 in Mode 5,pump Failed to Start.Caused by Improperly Terminated Lug in Breaker Control Wiring.Lead Properly Terminated & Reinstalled

/03L-0:on 791112,while Testing HPI Pump 1-1 in Mode 5,pump Failed to Start.Caused by Improperly Terminated Lug in Breaker Control Wiring.Lead Properly Terminated & Reinstalled

ML19211A282
Person / Time
Site:	Davis Besse
Issue date:	12/11/1979
From:	Naylor R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19211A277	List: 05000346/LER-1979-110, Forwards LER 79-110/03L-0 05000346/LER-1979-110-03, /03L-0:on 791112,while Testing HPI Pump 1-1 in Mode 5,pump Failed to Start.Caused by Improperly Terminated Lug in Breaker Control Wiring.Lead Properly Terminated & Reinstalled
References
LER-79-110-03L, LER-79-110-3L, NUDOCS 7912170309
Download: ML19211A282 (2)

LER-1979-110, /03L-0:on 791112,while Testing HPI Pump 1-1 in Mode 5,pump Failed to Start.Caused by Improperly Terminated Lug in Breaker Control Wiring.Lead Properly Terminated & Reinstalled

Event date:
Report date:
3461979110R03 - NRC Website

text

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8 60 64 OOCKET NUYBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 ] l On 11/12/79 while testing High Pressure Injection (HPI) Pump 1-1, it failed to start. l in the control circuit wiring.

l l o l3 l l This lead to the identification of a factory defect l The unit was in Mode 5, and HPI Pump 1-2 was operable during the period that HPI 1-1 o 4 There was no danger to the health and safety of the public or to loisj was inoperable.

HPI l-2 was operable during the period that HPI 1-1 was inopera-l o o l station personnel.

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l The cause was due to an improperly terminated lug in the breaker control wiring which; i

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Under MWO 79-3522, th9 done for the arc suppression for the breaker control circuits.

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Richard W. Naylor PHONE:

DVR 79-1,6 NAME OF PREPARER

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT OIE SUPPLDENTAL INFORMATION FOR LER NP-33-79-127_

DATE OF EVENT: November 12, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: High Pressure Injection Pump 1-1 failed to start dur-ing special testing Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MNT) = 0, and Load (Gross MWE) = 0.

Description of Occurrence: On November 12, 1979 while testing High Pressure Injection (HPI) Pump 1-1 af ter a modification for surge suppression in the cubicle, HPI Pump 1-1 failed to start.

Maintenance personnel stopped the test and commenced trouble-shooting. This lead to the identification of a factory def ect in the control circuit wiring. A lead had been improperly stripped prior to the lug being crLaped, thus the lead was insulated rather than the wire being crimped in the termination lug.

The unit was in bbde 5, and HPI Pump 1-2 was operable during the period that HPI l-1 was inoperable.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was due to an improperly terminated lug in the breaker control wiring which caused a bad connec-tion. The lug was crimped to the lead insulation rather than the wire. This was due to improper insulation removal when the cabinet was manufactured. The' condition was aggravated by the modification work which caused wires in that area to be moved which caused the discontinuity in that circuit. This modification work was being done for the arc suppression for the breaker control circuits.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel.

HPI 1-2 was operable during the period that HPI l-1 was inoperable and capable of supplying water to the core in the event of a safety features actuation.

Corrective Action

Under Maintenance Work Order 79-3522, the lead was properly ter-minated and reinstalled. The breaker was cycled several times and placed back to the i

original position and the pump started. Following the~ work, all testing for the arc suppression was completed, and the unit returned to operability at 1327 hours0.0154 days <br />0.369 hours <br />0.00219 weeks <br />5.049235e-4 months <br /> on November 13, 1979. Wiring within the cabinet was inspected, and no other improperly crimped wires were found.

Failure Data: No previously similar occurrences have been identified or reported.

1592 230 LER #79-110