ML20009E678

LER 81-035/03L-0:on 810616,regulating Rod Groups 6 & 7 Exceeded Overlap Requirements.Caused by Procedural Deficiencies Resulting in Failure to Note Loss of Permissive Logic When Transferring Power Supplies

ML20009E678
Person / Time
Site:	Crystal River
Issue date:	07/14/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E672	List: ML20009E671 ML20009E678
References
LER-81-035-03L, LER-81-35-3L, NUDOCS 8107280357
Download: ML20009E678 (2)

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.:_:- At 1525 following performance of PM-Y26, Electrical Checks of CRD Powe. Train, Regula - _

ting Rod Groups 6, & 7 exceeded the rod group-overlap requirement'of T.S. 3.1.3.6. The;

. ,, . overlap condition was corrected at 1535 by manually adjusting group 7 position. There

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8107280357 810714 PDR ADOCK 05000302 II .Cl - ' O ': Z' .~';TA.T .:.C-"NI 7.hC ;.~5 .'I .: I}

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f SUPPLEMENTARY INFORMATION Report No.: 50-302/81-035/03L-0 Facility: Crystal River Unit 3 Report Date: July 14,1981 Occurrence Date: June 16, 1981 Identification of Occurrence:

Regulating rod groups 6 & 7 exceeded the rod group cverlap requirement of Technical Specification 3.1.3.6.

Conditions Prior to Occurrence:

Mode 1 power operation (83%).

Description of Occurrence:

At 1525 following performance of PM-126 Electrical Checks of CRD Power Train, regulating rod group 7 failed to respond to the sequence auto signal. This resulted in group 6 being withdrawn to 100% while group.7 remained withdrawn at 15%.

Group 7 positi n was manually adjusted and compliance to the Technical Sp'.ification was achieved at 1535.

Designation of Apparent Cause:

The cause of this event is attributed to prccedural deficien-cies resulting in failure to recognize the loss of group out-limit for group 5 rods which disabled the permissive logic for sequencing group 7. The loss of out-limit occurred after transferring control power from auxiliary to normal supply at the completion of PM-126.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public'.

Corrective Action:

Rod group 5 position was adjusted to restore the out-limit for normal sequencing of group 7. Applicable procedures will be-revised to note the potential for disabling the permissive logic when transferring power' supplies.

Failure Data: 7 This was the first occurrence of this type and this is the third event reported under this Specification.

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