05000366/LER-1979-100-03, /03L-0:on 790905,while at 89% Power During Load Increase,Critical Mass Peaking Factor Was 2.57,exceeding 2.38 Limit.Computer Update Did Not Correct Problem.Caused by Inadequate Personnel Action

/03L-0:on 790905,while at 89% Power During Load Increase,Critical Mass Peaking Factor Was 2.57,exceeding 2.38 Limit.Computer Update Did Not Correct Problem.Caused by Inadequate Personnel Action

ML19208B464
Person / Time
Site:	Hatch
Issue date:	09/17/1979
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208B463	List: 05000366/LER-1979-100, Forwards LER 79-100/03L-0 05000366/LER-1979-100-03, /03L-0:on 790905,while at 89% Power During Load Increase,Critical Mass Peaking Factor Was 2.57,exceeding 2.38 Limit.Computer Update Did Not Correct Problem.Caused by Inadequate Personnel Action
References
LER-79-100-03L, LER-79-100-3L, NUDOCS 7909200350
Download: ML19208B464 (2)

LER-1979-100, /03L-0:on 790905,while at 89% Power During Load Increase,Critical Mass Peaking Factor Was 2.57,exceeding 2.38 Limit.Computer Update Did Not Correct Problem.Caused by Inadequate Personnel Action

Event date:
Report date:
3661979100R03 - NRC Website

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L'hile at ~89% power during a load increase, CMPF was fotind to be 2.570.

The limit isi jo j2;

,o,,j ; 2.38.

Flow increased and a computer update was performed to reduce CMPF.

After 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, the power had not dropped significantly and the APRMs had not been adjusted in [

p,,,, t violation of* Tech. Spec. 3.2.2.

Following the two hours, the rod pattern was adjusted j n

3 g g ; [ and another computer update t:as performed.

CMPF dropped to 2.105.

This is a repeti- ;

ti ccurrence - see LER 2-79-58.

There were no consequences to the hebith and safetz Lv o

of the public.

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[siui lFollowina moverent of control rods, CF.PF was found to exceed its linit.

Initial cor-j li li l Irective action taken did not significantly. reduce CMPF and the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> tiim lirit hild._.J g { elapsed before further action was coEnleted.

The rod pattern was adiusted cud a com-1 lputer update nts perforned which corrected the peakinq problem.

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lhave been advised that action taken was inadequate and have been reinstructed on i

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