05000338/LER-1979-039-03, /03L-0 on 790325:during Normal Operation,Power Supply to Hydrogen Recombiner Deenergized & Recombiner Inoperable for 10-h.Unit 2 Emergency Bus Degraded Voltage Protection Modified & Reenergized

/03L-0 on 790325:during Normal Operation,Power Supply to Hydrogen Recombiner Deenergized & Recombiner Inoperable for 10-h.Unit 2 Emergency Bus Degraded Voltage Protection Modified & Reenergized

ML19274E786
Person / Time
Site:	North Anna
Issue date:	04/19/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19274E784	List: 05000338/LER-1979-039-03, /03L-0 on 790325:during Normal Operation,Power Supply to Hydrogen Recombiner Deenergized & Recombiner Inoperable for 10-h.Unit 2 Emergency Bus Degraded Voltage Protection Modified & Reenergized 05000338/LER-1979-040-03, /03L-0 on 790326:during Steady State Operation, Periodic Calibr Revealed Nonconservative Overtemp Delta T Protection Circuitry Output.Caused by Instrument Drift. Summing Amplifier Card Replaced & Circuitry Recalibr ML19274E783
References
LER-79-039-03L, LER-79-39-3L, NUDOCS 7904240411
Download: ML19274E786 (1)

LER-1979-039, /03L-0 on 790325:during Normal Operation,Power Supply to Hydrogen Recombiner Deenergized & Recombiner Inoperable for 10-h.Unit 2 Emergency Bus Degraded Voltage Protection Modified & Reenergized

Event date:
Report date:
3381979039R03 - NRC Website

text

U. S. NUCLE AR REGUL ATORY COMMISSION

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' LVENT DATE

/4 lb HLPOHT DAT E 80 EVENT DESCRIPTION AND PROGABLE CONSEQUENCES h [During normal power operations, the power supply to the Unit 2 post DBA Hydtngon

___j o 2 go]3i lRecombiner was deenergized.

This action rendered the Hydrogen Recombiner. 2-HC-HC-1.

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[ inoperable for ten hours. This event did not jeopardize the health and safety _of tho I

O 4 lO is i [ general public since the Unit 1 Hydrogen Recombiner,1-HC-HC-1 was still available.

I Io in l l Reportable pursuant to T.S. 6.9.1.9.b.

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40 41 42 43 44 47 CAUSE DESCRIPTIGN AND CORRECTIVE ACTIONS [Necessary modifications to the Unit 2 Emergency Bus Deoraded Voltage Protection Svstom I i

o ti li l required the comrlete deenergization of the 2H 4160 volt bus and thornfnen thn opn uniti il i7; [ bus which supplies power to 2-HC-HC-1.

As soon as the work was complete. the Unit ?

I ii ;3l l Emergency Bus was reenergized.

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W. R. Cartwright psoNe:

NAME of PREPAftEft