05000324/LER-1981-024-03, /03L-0:on 810429,B & D Main Steam Lines Leak Detection Actuation Relay Power Supply Circuit Breaker Mistakenly Opened.Caused by Misreading of Handwritten List Identifying Proper Breaker to Open.Breaker Reclosed

/03L-0:on 810429,B & D Main Steam Lines Leak Detection Actuation Relay Power Supply Circuit Breaker Mistakenly Opened.Caused by Misreading of Handwritten List Identifying Proper Breaker to Open.Breaker Reclosed

ML20004C280
Person / Time
Site:	Brunswick
Issue date:	05/27/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004C276	List: 05000324/LER-1981-024, Forwards LER 81-024/03L-0 05000324/LER-1981-024-03, /03L-0:on 810429,B & D Main Steam Lines Leak Detection Actuation Relay Power Supply Circuit Breaker Mistakenly Opened.Caused by Misreading of Handwritten List Identifying Proper Breaker to Open.Breaker Reclosed
References
LER-81-024-03L, LER-81-24-3L, NUDOCS 8106020484
Download: ML20004C280 (2)

LER-1981-024, /03L-0:on 810429,B & D Main Steam Lines Leak Detection Actuation Relay Power Supply Circuit Breaker Mistakenly Opened.Caused by Misreading of Handwritten List Identifying Proper Breaker to Open.Breaker Reclosed

Event date:
Report date:
3241981024R03 - NRC Website

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60 61 DOCK ET Nuv8 E R od 6'J EVENT 0 ATE 74 7S REPORT OATE 80 EVENT DESCRIPTION ANo PROS ABLE CONSEQUENCES h foTTl lWhile attempting to open the power supply circuit breaker to B and D ?HR pumps' seal i

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LER ATTACHMENT - RO # 2-81-24 Facility: BSEP Unit No. 2 Event Date: April 29,1981 This event occurred due to a personnel error when a handwritten list of power supply circuit ~ breaker numbers, identifying specific circuit breakers to be opened during the perlormance of a plant surveillance PT, was misread and the power supply circuit breaker to main steam line leak detection actuation relay TR-33 was mistakenly opened. As a result, the initiation of a B RPS logic one-half Group 1 isolation signal occurred.

PT 24.1 requires the opening of the power supply breaker to B and D RHR pumps' seal cooler outlet valves, 2-SW-V125 and V126.

This breaker, circuit number 21, is located in the same power distribution panel as the TR-3B relay power supply circuit breaker, circuit number' 27.

Because the PT did not include a list of power supplys requiring manipulation, a hand-written list of the circuit numbers was composed by the senior control operator and given to a control operator, who, in turn, recopied the list and gave it to a second operator, whose job was to open the listed circuit breakers; In reading the handwritten list, the first operator mistakenly believed the 1 digit of the circuit number 21 was a 7 and thus wrote the circuit as number 27. As a result of opening circuit number 27, a B RPS logic one-half Group 1 isolation signal occurred due to the de-energization of the TR-3B relay. Following the discovery of this mistake, circuit number 27 was immediately closed and the isolation signal was reset.

In order to prevent any future similar occurrences, the personnel involved were counseled to ensure their awareness of the importance of understanding handwritten informatior. prior to performing any operation that could adversely affect the safety and/or operation of the plant.. -In addition, all Operations personnel will review this LER to ensure their awareness of this concern. A review of all plant pts will be made to assure that any power supplys requiring manipulation are properly identified and listed.

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