ML20027A375
| ML20027A375 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/22/1978 |
| From: | Beeler T, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML20027A371 | List: |
| References | |
| NUDOCS 7811210382 | |
| Download: ML20027A375 (2) | |
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LICENSEE EVENT REPORT f_J.
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[ The B&C phase surge, capacitors were discovered' to be damaged. ' Wes'tinghousq oi dl*has. determined this is due to a design deficiency. A Facility Change es so g (Request has been prepared which requests modifications be made.
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,o Jacque Lingenfelter/ T. Beeler (419) 259-5000, Ext. 251 DVR 123-1
i TOLEDO EDIS0N COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR TIR NP-33-77-64 t
DATE OF EVENT _: August 27, 1977 j
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 Occurrende_:
i and Load (MWE) = 0.
i 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 _:with instantaneous ground (50GS) and differential current 27, 1977, This placed the Station into the on August relay (87m/A-B-C) targets indicating the fault.
Action Statement of Technical Specification 3.4.1 since one of the two Reactor Coolant Pumps in the loop were not in operation.
Upon inspection of the Reactor Designation of Apparent Cause of Occurrence: Coolant Pump 1-1-2 moto d
l It has been determined by Westing-B&C phase surge capacitors to be damaged. house the desian of th 1
J There was no danger to the health and safety of the Analysis of Occurrence:
The thermal power was at a low valus and the public or Station personnel. remaining three Reactor Coolant Pumps were s i
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The high flux and the flux-delta-flux setpoints were reset for i l Specification Corrective Action:
three pump operation as required by the Action Statement of Techn ca Station maintenance personnel replaced C-phase surge capacitors and re-installed B-phase surge capacitors after caulking the crack in the porcelain an 3.4.1.
opening in the seas with RTV silicone sealant.
Reactor Coolant Pump 1-1-2 was declared operable.
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, This removed the station from Action Statemr at of Technical Specification 3.4 an inspection was made on the remaining reactor coolant pump A defective capacitor was found in A phase for Reactor Coolant Pump 1-2-2 29, 1977, On August A
Station maintenance personnel replaced A phase surge capacitor with a new one.
motors.78-470, has been prepared which requests all the RCP by Westinghouse.
motor capacitors be modified to the new mounting design recommended Facility Change Request, 1
Failure Data:_ No previous similar events have occurred.
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