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| document report number = NUDOCS 7902270260
| document report number = NUDOCS 7902270260
| package number = ML19274D938
| package number = ML19274D938
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO,LER), TEXT-SAFETY REPORT
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 2
| page count = 2
}}
}}


=Text=
=Text=
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Naut        Jacque Lingenfelter/ T. Beeler                                                                 (419)'259-5000, Ext. 251 rNoNc DVR 123-1 7902270260
1 7 8 Jacque Lingenfelter/ T. Beeler (419)'259-5000, Ext. 251 Naut rNoNc DVR 123-1 7902270260


~                                  TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-64 DATE OF EVENT: August 27, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:
TOLEDO EDISON COMPANY
Reactor Coolant Pump Motor 1-1-2 was declared inoperable on August 27, 1977.
~
Conditions Prior to Occurrence: The plant was in Mode 2, with Power (MWT) = 125 and Load (MWE) = 0.
DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-64 DATE OF EVENT: August 27, 1977 FACILITY: Davis-Besse Unit 1 Reactor Coolant Pump Motor 1-1-2 was declared IDENTIFICATION OF OCCURRENCE:
Description of Occurrence _:  Reactor Coolant Pump Motor 1-1-2 tripped at 1740 hours on August 27, 1977, with instantaneous ground (50GS) and differential current relay (87m/A-B-C) targets indicating the fault. This placed the Station into the Action Statement of Technical Specification 3.4.1 since one of the two Reactor Coolant Pumps in the loop were not in operation.
inoperable on August 27, 1977.
The plant was in Mode 2, with Power (MWT) = 125 Conditions Prior to Occurrence:
and Load (MWE) = 0.
Reactor Coolant Pump Motor 1-1-2 tripped at 1740 hours Description of Occurrence _:
on August 27, 1977, with instantaneous ground (50GS) and differential current relay (87m/A-B-C) targets indicating the fault. This placed the Station into the Action Statement of Technical Specification 3.4.1 since one of the two Reactor Coolant Pumps in the loop were not in operation.
Designation of Apparent Cause of Occurrence: Upon inspection of the Reactor Coolant Pump 1-1-2 motor terminal box, Station maintenance personnel discovered It has been determined by Westing-B&C phase surge capacitors to be damaged.
Designation of Apparent Cause of Occurrence: Upon inspection of the Reactor Coolant Pump 1-1-2 motor terminal box, Station maintenance personnel discovered It has been determined by Westing-B&C phase surge capacitors to be damaged.
house the design of the capacitor base was insufficient for the application.
house the design of the capacitor base was insufficient for the application.
Analysis of Occurrence:    There was no danger to the health and safety of the public or Station personnel. The thermal power was at a low value and the remaining three Reactor Coolant Pumps were supplying the required coolant flow.
There was no danger to the health and safety of the Analysis of Occurrence:
Corrective Action: The high flux and the flux-delta-flux setpoints were reset for three pump operation as required by the Action Statement of Technical Specification 3.4.1. Station maintenance personnel replaced C-phase surge capacitors and re-installed B-phase surge capacitors after caulking the crack in the porcelain and opening in the seam with RTV silicone sealant.
public or Station personnel. The thermal power was at a low value and the remaining three Reactor Coolant Pumps were supplying the required coolant flow.
Corrective Action: The high flux and the flux-delta-flux setpoints were reset for three pump operation as required by the Action Statement of Technical Specification Station maintenance personnel replaced C-phase surge capacitors and re-3.4.1.
installed B-phase surge capacitors after caulking the crack in the porcelain and opening in the seam with RTV silicone sealant.
At 0058 hours on August 31, 1977, Reactor Coolant Pump 1-1-2 was declared operable.
At 0058 hours on August 31, 1977, Reactor Coolant Pump 1-1-2 was declared operable.
This removed the station from Action Statement of Technical Specification 3.4.1.a.
This removed the station from Action Statement of Technical Specification 3.4.1.a.
On August 29, 1977, an inspection was made on the remaining reactor coolant pump motors.
29, 1977, an inspection was made on the remaining reactor coolant pump On AugustA defective capacitor was found in A phase for Reactor Coolant Pump 1-2-2.
A defective capacitor was found in A phase for Reactor Coolant Pump 1-2-2.
motors.
As Station maintenance personnel replaced A phase surge capacitor with a new one.
As Station maintenance personnel replaced A phase surge capacitor with a new one.
2    per Facility Change Request 78-470, the capacitors on all four Reactor Coolant Pump motors have been replaced with new units which incorporate a new design mount-ing base as of January 20, 1979.
78-470, the capacitors on all four Reactor Coolant per Facility Change Request 2
Pump motors have been replaced with new units which incorporate a new design mount-ing base as of January 20, 1979.
Failure Data: No previous similar events have occurred.}}
Failure Data: No previous similar events have occurred.}}

Latest revision as of 04:46, 3 January 2025

LER NP-33-77-64 on 770827:reactor Coolant Pump 1-1-2 Tripped,Removing One of Two Reactor Coolant Pumps from Operation.Caused by Damage to Surge Capacitors Due to Insufficient Mounting Base
ML19274D939
Person / Time
Site: Davis Besse 
Issue date: 09/22/1977
From: Beeler T, Lingenfelter J
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19274D938 List:
References
NUDOCS 7902270260
Download: ML19274D939 (2)
v • d • e


Text

LICENSEE EVENT REPORT CoNinot at oC" 1._ L 1 I 1 IJ 4

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1 7 8 Jacque Lingenfelter/ T. Beeler (419)'259-5000, Ext. 251 Naut rNoNc DVR 123-1 7902270260

TOLEDO EDISON COMPANY

~

DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-64 DATE OF EVENT: August 27, 1977 FACILITY: Davis-Besse Unit 1 Reactor Coolant Pump Motor 1-1-2 was declared IDENTIFICATION OF OCCURRENCE:

inoperable on August 27, 1977.

The plant was in Mode 2, with Power (MWT) = 125 Conditions Prior to Occurrence:

and Load (MWE) = 0.

Reactor Coolant Pump Motor 1-1-2 tripped at 1740 hours0.0201 days <br />0.483 hours <br />0.00288 weeks <br />6.6207e-4 months <br /> Description of Occurrence _:

on August 27, 1977, with instantaneous ground (50GS) and differential current relay (87m/A-B-C) targets indicating the fault. This placed the Station into the Action Statement of Technical Specification 3.4.1 since one of the two Reactor Coolant Pumps in the loop were not in operation.

Designation of Apparent Cause of Occurrence: Upon inspection of the Reactor Coolant Pump 1-1-2 motor terminal box, Station maintenance personnel discovered It has been determined by Westing-B&C phase surge capacitors to be damaged.

house the design of the capacitor base was insufficient for the application.

There was no danger to the health and safety of the Analysis of Occurrence:

public or Station personnel. The thermal power was at a low value and the remaining three Reactor Coolant Pumps were supplying the required coolant flow.

Corrective Action: The high flux and the flux-delta-flux setpoints were reset for three pump operation as required by the Action Statement of Technical Specification Station maintenance personnel replaced C-phase surge capacitors and re-3.4.1.

installed B-phase surge capacitors after caulking the crack in the porcelain and opening in the seam with RTV silicone sealant.

At 0058 hours6.712963e-4 days <br />0.0161 hours <br />9.589947e-5 weeks <br />2.2069e-5 months <br /> on August 31, 1977, Reactor Coolant Pump 1-1-2 was declared operable.

This removed the station from Action Statement of Technical Specification 3.4.1.a.

29, 1977, an inspection was made on the remaining reactor coolant pump On AugustA defective capacitor was found in A phase for Reactor Coolant Pump 1-2-2.

motors.

As Station maintenance personnel replaced A phase surge capacitor with a new one.78-470, the capacitors on all four Reactor Coolant per Facility Change Request 2

Pump motors have been replaced with new units which incorporate a new design mount-ing base as of January 20, 1979.

Failure Data: No previous similar events have occurred.

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