05000338/LER-1981-011-03, /03L-0:on 810117,w/unit in Mode 6,loss of Power to Radiation Monitor Common Alarms Panel Was Experienced for Less than 5 Minutes.Caused by Failure of Electrician to Switch Power to Unit 2 During Unit 1 Trip

/03L-0:on 810117,w/unit in Mode 6,loss of Power to Radiation Monitor Common Alarms Panel Was Experienced for Less than 5 Minutes.Caused by Failure of Electrician to Switch Power to Unit 2 During Unit 1 Trip

ML19343C040
Person / Time
Site:	North Anna
Issue date:	02/11/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343C033	List: 05000338/LER-1981-011, Forwards LER 81-011/03L-0 05000338/LER-1981-011-03, /03L-0:on 810117,w/unit in Mode 6,loss of Power to Radiation Monitor Common Alarms Panel Was Experienced for Less than 5 Minutes.Caused by Failure of Electrician to Switch Power to Unit 2 During Unit 1 Trip
References
LER-81-011-03L-01, LER-81-11-3L-1, NUDOCS 8102180522
Download: ML19343C040 (2)

LER-1981-011, /03L-0:on 810117,w/unit in Mode 6,loss of Power to Radiation Monitor Common Alarms Panel Was Experienced for Less than 5 Minutes.Caused by Failure of Electrician to Switch Power to Unit 2 During Unit 1 Trip

Event date:
Report date:
3381981011R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On January 17, 1931, with unit I in mode 6, a loss of power to the radiation

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monitor common alarms panel was experienced for a period of time of less than /

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five minutes. Since the power to the alarms was quickly restored within the

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time requirements of the LCO, the health and safety of the public were not

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affected.

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SYSTEM

CAUSE

CAUSE COMP.

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

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ACTION FUTURE.

EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. -COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27) l

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This incident occurred with an electrician tripping the Unit I 480V breaker for/

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the common rad alarm panel (af ter verifying Unit 2-480V breaker closed) but

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without having switched power to Unit 2 via a remote switch. Corrective action /

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included restoring power and informing the maintenance personnel of their

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error.

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FACILITY METHOD OF STATUS

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LOSS OF OR DAMAGE TO FACILITY

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8102180522

4 Virginia Electric and Power Company North Anna Power Station, Unit #1 Attachment: Page 1 of I Docket No. 50-338 Report No. LER 81-011/03L-0

Description of Event

On January 17, 1981, with Unit I in mode 6, a loss of power to the radiation monitor common alarms panel was experienced for period of time of less than 5 minutes. This eveat is contrary to T.S. 3.3.3.1, and reportable pursuant to T.S. 6.9.1.9.c.

Probable Consequences of Occurrence Since the power was restored within five minutes, well within the requirements of the LCO, the health and safety of the public were not affected.

Cause of Event

The event occured as a result of an electrician tripping the main breaker on Emergency MCC IJ1-1 for the common radiation alarm panel after he had verified the breaker was in place on Unit 2 Emergency MCC-2J1-1, but without having swapped power to Unit 2 via a remote switch f.n the emergency switchgear room.

ImmediateJ p;rective Action The inmedirte corrective action was to restore power to the affected panel, and by switching the power supply to Unit 2 in order for the 480V breaker to be worked on Unit 1.

Scheduled Corrective Action There is no scheduled corrective action.

Actions Taken to Prevent Recurrence The personnel involved were reinstructed to more carefully review switching instructions prior to removal of a breaker from service.

Generic Implications There are no generic implication to this event.