05000338/LER-1979-022-03, /03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements

/03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements

ML19282C596
Person / Time
Site:	North Anna
Issue date:	03/26/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19282C591	List: 05000338/LER-1979-022-03, /03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements 05000338/LER-1979-028-03, /03L-0 on 790225:greater than 12-step Disagreement Noted Among Rod Position Indication,Computer Position Indication & Demand Signal Indication for Rod 9.Caused by Voltage Drift in Signal Conditioning Card ML19282C590
References
LER-79-022-03L, LER-79-22-3L, NUDOCS 7903300372
Download: ML19282C596 (1)

LER-1979-022, /03L-0 on 790227:power Supply to Post DBA H Recombiner Deenergized Rendering Recombiner Inoperable for 4-h.Caused by Deenergizing of Motor Control Center to Perform Voltage Measurements

Event date:
Report date:
3381979022R03 - NRC Website

text

NRC FORM 3GG U.S. NUCLE AR R EGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT CONTROL eLocK: l l

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI lVIAlNlAlSl1l@!0 0

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7 8 9 LICENSEE CODE 14 13 LfCENSE NuYBER 22 26 LICE?.>E T ) FE JJ bl C A 1 SS CON'T

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8 t,U 61 DOCK E T NUYdER ta 6J EVENT DATE 74 75 HEPORT DA IL 80 EVEN T DESCRIPTION AND PROBABLE CONSEQUENCES h lDuring normal power operations, the power supply to the Unit #2 post DBA Hydrogen 1

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[0,3, ;Recombiner was deenergized. This action rendered the Hydrogen Recombiner, 2-HC-HC-1, I

[D i4 i [ inoperable for four hours.

This event did not jeopardize the health and safety of I

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Ithe general public as the unit 1 recombir.er was still available.

Reportable oursuant 1 el lto T.S. 6.9.1.9.b.

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OCCURRENCE REPORT REVISION LE R 'RO EVENT YE AR R EPORT NG.

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J3 34 35 36 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h IMotor control center MCC 2Hl-2S was deenergi7ed in nrdar tn norfnrm un1+nnn I

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i li Lmeasurements which were required on emergency A-C nnwor eyetom mnauientient tn hn I

it mplemented on Unit 1 for degraded voltaae Drotection.

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IiI3I hiere completed, MCC 2Hl-2S was reeneraized.

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,EnSONNa'IN,unS NUMBER

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