ML19329B892

RO NP-33-77-11:on 770613,safety Features Actuation Sys Channel 2,RE 2005,deliberately Tripped to Megger Cable Cwr 79-E-64.Channel 2 Radiation Instrument String Returned to Normal After Megger Test

ML19329B892
Person / Time
Site:	Davis Besse
Issue date:	07/07/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19329B888	List: ML19329B887 ML19329B892
References
NUDOCS 8002060890
Download: ML19329B892 (2)

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IVE N T DI SC#'P f'ON (Q]l Deliberate 1v tripp,c,d RE 2005 "SFAS Channel 2 Containment Radiktion" i:o l

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• TOLEDO EDISON COMPANY

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DAVIS-BESSE UNIT ONE NUC1. EAR PO'4ER STATION

• SUPPLEMENTAL INFORMATION FOR LER NP-33-77-ll

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DATE OF EVENT: June 13,1977 FACILITY: Davis-Besse Unit 1

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. IDENTIFICATION OF OCCURRENCE: Deliberately removing RE 2005 from service to megger l 'its cable.

Conditions Prior to Occurrence: The plant was in Mode 5. Power: 5T-0, %'E-0

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Description of Occurrence: At 0942 hours0.0109 days <br />0.262 hours <br />0.00156 weeks <br />3.58431e-4 months <br /> on June 13, 1977, deliberately tripped 1 RE 2005 "SFAS Channel 2 Containment Radiation" to magger the cable (C'JP 79-E-64) j placing-us in an Action Statement #9 of Table 3.3-3. i i t l Designation of Apparent Cause of Occurrence: Delib'erately tripped RE 2005 to  ;

magger cable.

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• Analysis of Occurrence: Since the SFAS Channel 2 Radiation Instrument String was f

! placed in the tripped position and the remaining three SFAS radiation instrument i

strings were operable, no threat to the health and safety of the public or to  !

station personnel occurred. 1 Corrective Action: After the magger test was completed, the SFAS Channel 2 Radia-tion Instrument String was returned to normal.

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Failure Data: No previous similar events have ocebrred.

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