ML20150A632

LER#78-059/03L-1 on 780806:reactor Pwr Increased Above Admin Level of 91% & Tech Spec 4.2.6.1 Limit of 94% W/O Determining Axial Pwr Dist Factor Fz. Caused by Personnel Error. (Encl to 78809190234)

ML20150A632
Person / Time
Site:	Cook
Issue date:	09/08/1978
From:	Lease D INDIANA MICHIGAN POWER CO.
To:
References
LER-78-059-03L, NUDOCS 7809190237
Download: ML20150A632 (1)

Text

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EVENT DESCRIPTION AND PROBAOLE CONSEQUENCES h I

lo 121 l REACTOR POWER WAS INCREASED ABOVE THE ADMINISTRATIVE LIMIT OF 91% AND THE TECH.

l io i3i l SPEC. 4.2.6.1 LIMIT OF 94% WITHOUT DETERMINING THE AXIAL POWER DISTRIBUTION l

1o io i l FACTOR FZ. THE AXIAL POWER DISTRIBUTION MONITORING SYSTEMS WAS ENERGIZED AT loisi ; 90% BUT FAILED TO FUNCTION. THE UNIT SUPERVISOR RECOGNIZED THIS AND HE ]

ioisj l ATTEMPTED TO GET MANUAL SCANS BUT FAILED. HE ALSO FAILED TO INSTRUCT REACTOR 1

[ o l 7 l j OPERATOR TO STOP POWER INCREASE. REACTOR POWER REACHED 95% BEFORE IT WAS I i o g i l RETURNED BELOW 91%. _l

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i I o l i FAILURE OF THE UNIT SUPERVISOR TO TERMINATE THE POWER INCREASE AT 91%. THIS I I

I i 11 i I INCIDENT HAS BEEN REVIEWED WITH THE UNIT SUPERVISOR AND THE SHIFT SUPERVISOR li121 l INVOLVED. A PROCEDURE CHANGE HAS BEEN ISSUED WHICH PERMITS THE OPERATOR T0 I l1 131 l USE THE P250 COMPUTER TO DETERMINE THE AXI AL POWER DISTRIBUTION FACTOR WHEN j

I g i THE APDMS IS NOT FUNCTIONING.

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