05000368/LER-1979-018-03, /03L-0 on 790115: Engineered Safety Features Actuation Sys Auxiliary Control Cabinet 2c-39, Bays 6 & 8 Power Supply Breakers from 2RS-2 Were Open.Breakers Reset to Meet Tech Spec Requirements

/03L-0 on 790115: Engineered Safety Features Actuation Sys Auxiliary Control Cabinet 2c-39, Bays 6 & 8 Power Supply Breakers from 2RS-2 Were Open.Breakers Reset to Meet Tech Spec Requirements

ML19263C347
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/14/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263C344	List: 05000368/LER-1979-018, Forwards LER 79-018/03L-0 05000368/LER-1979-018-03, /03L-0 on 790115: Engineered Safety Features Actuation Sys Auxiliary Control Cabinet 2c-39, Bays 6 & 8 Power Supply Breakers from 2RS-2 Were Open.Breakers Reset to Meet Tech Spec Requirements
References
LER-79-018-03L, LER-79-18-3L, NUDOCS 7902220020
Download: ML19263C347 (1)

LER-1979-018, /03L-0 on 790115: Engineered Safety Features Actuation Sys Auxiliary Control Cabinet 2c-39, Bays 6 & 8 Power Supply Breakers from 2RS-2 Were Open.Breakers Reset to Meet Tech Spec Requirements

Event date:
Report date:
3681979018R03 - NRC Website

text

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9 NRC FORM 366 U. S NUCLE AR REGUL ATORY COMVf SSION (7 77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK-l l l l l l lh (PLE ASE PRINT OR TYPE ALL REOutRED INFORMATICN l AjR l A j Nj 012 l@hl 0 j0 l -l0 l 0 l 0l 0l 0 )- l 0 l0 lg l1 l 1l1 l 1lgl lg o

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'S HEPOH1 C ATE 50 EVENT DESCRIPTION AND PROBADLE CONSEQUENCES h n12 I During Mode 1 operation, ESFAS auxiliary control cabinet, 2C-39, bays 4

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1 6 and 8 power supply breakers from 2RS-2 were found open, removing l

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I redundancy to all red string actuating relays.

No s_ystems were made i

inoperable. no L.C.0. violation.

If other breakers had been opened at i

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o 6

the sane tine. premature ECCS actuation due to loss of DC power cculd i

LJl have been possible.

No similar occurrences.

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