05000368/LER-1979-011-03, /03L-0 on 790125:during Power Escalation,Channel B Core Protection Computer Failed,Resulting in Departure from Nucleate Boiling Ratio & Linear Power Density Trips. Caused by Movement of Temporary Cables Connected to B

/03L-0 on 790125:during Power Escalation,Channel B Core Protection Computer Failed,Resulting in Departure from Nucleate Boiling Ratio & Linear Power Density Trips. Caused by Movement of Temporary Cables Connected to B

ML19274D954
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/23/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19274D953	List: 05000368/LER-1979-011, Forwards LER 79-011/03L-0 05000368/LER-1979-011-03, /03L-0 on 790125:during Power Escalation,Channel B Core Protection Computer Failed,Resulting in Departure from Nucleate Boiling Ratio & Linear Power Density Trips. Caused by Movement of Temporary Cables Connected to B
References
FOIA-79-149 LER-79-011-03L, LER-79-11-3L, NUDOCS 7902270280
Download: ML19274D954 (1)

LER-1979-011, /03L-0 on 790125:during Power Escalation,Channel B Core Protection Computer Failed,Resulting in Departure from Nucleate Boiling Ratio & Linear Power Density Trips. Caused by Movement of Temporary Cables Connected to B

Event date:
Report date:
3681979011R03 - NRC Website

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NRC FOHM 366 U S NUCLE AR RE GUL ATOFtv COMMISSIGN (71F)

LICENSEE EVENT REPORT EXHIBIT A CONYHOL OLOW 1l l l 1 lh

!PLE ASE PHINT OR T YPE ALL AECUIRED INFO AMATION:

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• E ENCES g,3 l During Power Escalation testing, steady state Mode 1 operation, ETJJ LChannel "B" CPC failed, resulting in DNBR and LPD trips in the "B" l

(2D.] LPPS Chan_n_ch__Th_e_DXBR and LPD trips were bypassed, _ _0ther_qccurrenc_e3 I

tng ginvolving "B" CPC are LER 50-368/79-006 and 79.007.

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40 41 41 4J 44 er i, i o, ( Temporary Cables were connec@ted to CPC "B"

inputs for process noise Caust Of SCH.P TION AND CCHHfC HVE ACHOM i

tiIi1I measurement testing ancing power ew,1,tinn=

Ciming nf_the CPC Charmd gi B cabinet door apparently moved the cables initiating an erroneous i

Lsignal, causing the CPC to fail. The CPC was declared operabic within 1 i i 3 til41Lhnur neering reonirenents of Action Statement TS_ Table 3.3-1 #2 G #6.

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