05000325/LER-1982-038, Updated LER 82-038/03L-1:on 820419.Reactor Scrammed When Electrical Bus 1A-1 Dc de-energized.Caused by Operator Error in Opening 125-volt Dc Battery Charger Output Breaker for Battery 1A-1.Breaker Closed & Power Restored to Bus

Updated LER 82-038/03L-1:on 820419.Reactor Scrammed When Electrical Bus 1A-1 Dc de-energized.Caused by Operator Error in Opening 125-volt Dc Battery Charger Output Breaker for Battery 1A-1.Breaker Closed & Power Restored to Bus

ML20054E531
Person / Time
Site:	Brunswick
Issue date:	06/04/1982
From:	Poulk R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054E525	List: 05000325/LER-1982-038, Updated LER 82-038/03L-1:on 820419.Reactor Scrammed When Electrical Bus 1A-1 Dc de-energized.Caused by Operator Error in Opening 125-volt Dc Battery Charger Output Breaker for Battery 1A-1.Breaker Closed & Power Restored to Bus
References
LER-82-038-03L, LER-82-38-3L, NUDOCS 8206110314
Download: ML20054E531 (2)

LER-2082-038, Updated LER 82-038/03L-1:on 820419.Reactor Scrammed When Electrical Bus 1A-1 Dc de-energized.Caused by Operator Error in Opening 125-volt Dc Battery Charger Output Breaker for Battery 1A-1.Breaker Closed & Power Restored to Bus

Event date:
Report date:
3252082038R00 - NRC Website

text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION 87 77) . Update Report: Previous Report

,, LICENSEE EVENT REPORT Date 5-17-82 v

CONTROL BLOCK: l l' l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l o l 81 9l l N LICENSEE 7

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EVENT DESCntPTION AND PROBABLE CONSEQUENCES h l o l 2 l l During plant operation, the 125 volt DC battery charger output breaker for batterv l lOlall1A-1 was inadvertently opened while removing an electrical clearance on the Division l lnl4llI battery, which was isolated for preventative maintenance. This de-energized the l lol3; [1A-1 DC electrical bus which resulted in an automatic reactor scram. This event did l lOisl Inot affect the health and safety of the public. l I

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. SEQUENTI AL OCCURRENCE REPORT EVENT YEAR REPOR T NO. CODE TYPE NO.

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33 34 [35 3/ 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 ltlO1lAn operator assigned to perform an independent verification of the clearance removal. l li j i l l removed the tag to battery charger breaker and, assuming that the breaker needed to I

, ., gbe repositioned, opened the breaker. The operator, assigned to remove the clearance I y , i ., i l and briefed on the proper sequence, immediately reclosed the breaker, and restored l

, 4 l power to the IA-1 bus. l 7 8 9 80 ST S  % POWER OTHER STATUS ISCO Y DISCOVERY DESCRIPTION i 5 l E l@ l 0 l 6 l 0 l@l NA l W hlOperational Event l AC TIVI T Y CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 1 6 W h (_Z_j@l NA 44 l l 45 NA 80 l

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LER ATTACil. MENT - RO #1-82-38 Facility: BSEP Unit No. 1 Event Date: April 19, 1982 While removing an equipment clearance on the Division I, 125 VDC battery, IA-1, an auxiliary operator (AO) assigned to perform a second verification for the clearaace removal removed the red tag from and opened the battery charger output breaker, causing an automatic reactor scram.

This event occurred due to an A0 performing a job in which he was not assigned nor briefed. Prior to removing the clearance, an A0 was assigned to remove the clearance on battery 1A-1 and had been briefed by the control operator on the proper sequence for removing the clearance and restoring the battery to service A second AO, assigned to perform a second lineup verification following the removal of the clearance by the first AO, decided to help the first A0 remove the clearance, lie removed the red tag from the battery charger breaker (the charger was supplying the bus) and assuming that the breaker needed to be repositioned, opened the breaker. The first A0 immediately recognized the problem and the breaker was reclosed restoring power to the bus.

Following this event, the inv;1ved auxiliary operators were counseled concerning this event. In addition, a training session on the application of the clearance procedure was conducted with the shift of the two involved personnel. Furthermore, on-the-job training concerning this event will be conducted with the remaining Operations' shifts.