ML19326A336

LER 78-087/03L-0:on 780801,regulating Rod Position Verification Not Completed at 4-h Intervals.Caused by Personnel Failure to Verify Insertion Limits.Required Control Rod Position Verification Completed

ML19326A336
Person / Time
Site:	Davis Besse
Issue date:	08/28/1978
From:	Hay J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A310	List: ML19326A309 ML19326A336
References
LER-78-087-03L, LER-78-87-3L, NUDOCS 8002030154
Download: ML19326A336 (2)

Text

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67 771 e LICENSEE EVENT REPORT 9

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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g 77l l quirements trere not met as per T.S. 3/4.1.3.6a, when the regulating rod insertion gT7] l alarm is inopet.able. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> verification should have begun when the unit entered i or to [

RTTI I Mode 2 on 7/23/78. There was no danger to the health and safety of the publi I

RTa 1 I unit personnel. verification of insertion limits was comoleted once per shift since (NP-33-78-103) l g o l 7 l l startup as per Surveillance Test ST 5099.01.

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, l on 8/1/78, the Control Room completed the required control rod eosition verification.

from violation of Surveillance Require =ent 4.3.1.6a. Thist

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O T TOLEDO EDISON COMPANY d DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-103 DATE OF EVENT: August 1,1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The verification of the position of each regulating

.a rod was not completed at the four (4) hour intervals.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power OiWT) = 1050, and Load (EWE) = 330 Description of Occurrence: On August 1, 1978, at 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br />, station personnel discovered that surveillance requirements were not met as per Technical Specifica-tion 3/4.1.3.6a. This Technical Specification requires that the position of each regulating group shall be determined to be within the insertion, sequence, and overlap limits at least once every twleve (12) hours except when the regulating rod insertion alars is inoperable; then verify the groups to be within the inser-

,s tion limits at least once per four (4) hours. The four hour verification should j have begun when the. unit entered Mode 2 on July 23, 1978.

Designation of Apparent Cause of Occurrence: Personnel error is attributed as the cause of this occurrence. The control room operators should Tiave been aware of the four hour verifications for the insertion limits. On July 23, 1978, at 1916 hours0.0222 days <br />0.532 hours <br />0.00317 weeks <br />7.29038e-4 months <br />, the reactor was critical. Since at this time the regulating rod insertion limit .

alarm was inoperable and the required four hour verification did not commence until August 1,1978 at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />, the unit was in violation of Technical Speci-fication 4.3.1.6a.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. Verification of insertion limits was completed once per shif t since startup as per Surveillance Test ST 5099.01. ,

I Corrective Action: At 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> on August 1,1978, the Control Room completed the required control rod position verification. This action re=oved the unit from vio-lation of Surveillance Requirement 4.3.1.6a. Also, copies of this report will be f distributed to responsible persons to prevent future recurrence.

Failure Data: This is not a repetitive occurrence.

LER #78-087 m

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