ML19263C347

LER 79-018/03L-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

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: ML19263C343 ML19263C347
References
LER-79-018-03L, LER-79-18-3L, NUDOCS 7902220020
Download: ML19263C347 (1)

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 _

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i 8 60 6i OOCLET NUMBER td EVENT DATE 14 HEPOH1 C ATE 50 EVENT DESCRIPTION AND PROBADLE CONSEQUENCES h n12 I During Mode 1 operation, ESFAS auxiliary control cabinet, 2C-39, bays 4 o 2 1 6 and 8 power supply breakers from 2RS-2 were found open, removing l o 4 I redundancy to all red string actuating relays. No s_ystems were made i o 5 inoperable. no L.C.0. violation. If other breakers had been opened at i o 6 the sane tine. premature ECCS actuation due to loss of DC power cculd i a LJl have been possible. No similar occurrences. Reportable per T.S.6.9.1.9 ;

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