ML19208B464

LER 79-100/03L-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

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: ML19208B462 ML19208B464
References
LER-79-100-03L, LER-79-100-3L, NUDOCS 7909200350
Download: ML19208B464 (2)

Text

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jo j2; L'hile at ~89% power during a load increase, CMPF was fotind to be 2.570. The limit isi Flow increased and a computer update was performed to reduce CMPF. After 2  ;

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hours, 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 ,

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CMPF dropped to 2.105. This is a repeti- ;

ccurrence - see LER 2-79-58. There were no consequences to the hebith and safetz o  ;

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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 i 3 lputer update nts perforned which corrected the peakinq problem. Personnel involved I i

ip lhave been advised that action taken was inadequate and have been reinstructed on E3 7 C S a,* E T H O"J CF .

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Cause Description and Corrective Actions (Cont.)

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