ML19319B775

RO NP-33-77-41:on 770810,auxiliary Feed Pump 1-2 Removed from Svc to Implement Wiring Change Reducing Relay Contact Amperage Per Facility Change Request 77-199. Wiring Completed & Feed Pump Returned to Svc on 770810

ML19319B775
Person / Time
Site:	Davis Besse
Issue date:	09/06/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19319B681	List: ML19319B680 ML19319B775
References
NUDOCS 8001270245
Download: ML19319B775 (2)

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DAVIS-BESSE UNIT ONE NUCLEAR POWER STATI'ON SUPPLEMENTAL INFORMATION FOR LER NP-33-77-41 DATE OF EVENT: August 10, 1977 FACILITY : Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-2 inoperable to implement wiring change of FCR 77-199.

Conditions Prior to Occurrence: The plant was in Mode 3 (Hot Standby), with Power (MWT) = 0 and Load (MWE) = 0.

Description of Occurrence: At 0545 hours0.00631 days <br />0.151 hours <br />9.011243e-4 weeks <br />2.073725e-4 months <br /> on August 10, 1977, Auxiliary Feed Pump *

(AFP) 1-2 was removed f rom service to implement a wiring change per Maintenance Work Order MWO 77-1658. This wiring change was to reduce the relay contact amper-age to prevent relay contact failure by placing an additional relay in the cir-cuits which operate the speed changer motor, s This placed the station into the Action Statement of Technical Specification

) 3.7.1.2 which requires both Auxiliary Feed Pumps to be operable in Mode 3, Hot Standby.

Designation of Anoarent Cause of Occurrence: This was a deliberate entry into the Action Statement to perform the wiring change as was requested per Facility Change Request FCR 77-199. ,

Analysis of Occurrence: There was no threat to the health and safety of the public or to station personnel. Auxiliary Feed Pump 1-1 was available to supply auxiliary feedwater if needed.

Corrective Action: The wiring change was completed, the AFP tested and declared operable by 2355 hours0.0273 days <br />0.654 hours <br />0.00389 weeks <br />8.960775e-4 months <br /> on August 10, 1977. This removed the station from the Action Statement of Technical Specification 3.7.1.2.

AFP l-1 wiring change was completed on August 9,1977 at 1250 hours0.0145 days <br />0.347 hours <br />0.00207 weeks <br />4.75625e-4 months <br />. The wiring

, change was implemented while AFP l-1 was inoperable from 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on August 7 to 1250 hours0.0145 days <br />0.347 hours <br />0.00207 weeks <br />4.75625e-4 months <br /> on August 9. See NP-33-77-52.

Failure Data: Failure data reported under LER NP-33-77-52.

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