05000366/LER-1981-024-03, /03L-0:on 810329,post-treatment Monitor 2D11-K615A Drifted Downscale.Caused by Discharged 24/58-volt Battery 2A Due to Battery Charger 2AB Not Carrying Dc Load.Charger Reset

/03L-0:on 810329,post-treatment Monitor 2D11-K615A Drifted Downscale.Caused by Discharged 24/58-volt Battery 2A Due to Battery Charger 2AB Not Carrying Dc Load.Charger Reset

ML19347E294
Person / Time
Site:	Hatch
Issue date:	04/16/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347E291	List: 05000366/LER-1981-024, Forwards LER 81-024/03L-0 05000366/LER-1981-024-03, /03L-0:on 810329,post-treatment Monitor 2D11-K615A Drifted Downscale.Caused by Discharged 24/58-volt Battery 2A Due to Battery Charger 2AB Not Carrying Dc Load.Charger Reset
References
LER-81-024-03L, LER-81-24-3L, NUDOCS 8104240538
Download: ML19347E294 (2)

LER-1981-024, /03L-0:on 810329,post-treatment Monitor 2D11-K615A Drifted Downscale.Caused by Discharged 24/58-volt Battery 2A Due to Battery Charger 2AB Not Carrying Dc Load.Charger Reset

Event date:
Report date:
3661981024R03 - NRC Website

text

17T'T F Ul U i J14U U nl 1.lCENSEE EVENT REPORT

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EVENT DATE 14 75 REPOHT DATE 80 EVENT DESCRIPTION AND PROBABLE CoNSEoVENCES h, 7

8 [1@ile performina normal shif t activities the posttreatment monitc,r 2011-1 o 2 1 o 131 IK615 A s tarted dri f ting downscale, and the " POSTTREATMENT OFFGAS RAD MON-l 1o 141 LITOR llI-HI-HI OR IN0P" was received.

Per Tech Specs table 3.3.6.1-1, I

Itwo posttreatment rad monitors must be operable when in condition 1.

Asl o s 10161 la result of the above monitor beina inon only one rad monitor was avail-1 l o 'l 'i l l a b l e.

There were no effects upon public health and safety due to this I

10181 levent.

This is a nonrepetitive event.

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33 34 3h 3G 31 40 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o lit was determined that 24/48 volt DC battery charaer 2AB was not carry-1 ITlT) li na th e DC l oa d ; therefore, half of the 2A 24/48 volt batterv carried I

Ithe load and gradually discharged rstil the above rad monitor became I

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The charger was reset and the posttreatment rad monitor 2011-1 I

IK615A returned to normal oneration.

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LER f:

50-366/1981-024 Licensec:

Georgia Power Company Facility Name:

Edwin I. Ilatch

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Docket #:

50-366

Narrative

Report for LER.50-366/1981-024 Whlic performing normal shift activitics, the posttreatment rad monitor 2D11-K615A started drifting downscalc, and the

" POSTTREATMENT OFFGAS RAD MONITOR llI-III-ill OR INOP" ala rm was received.

Tech Specs tabic 3.3.6.1-1 requires that two post-treatment rad monitors must be operabic when in condition 1.

As a result of the above rad monitor being inop this require-ment could not be met.

Further investigation revealed that 24/48 volt battery charger 2AB was not carrying the DC load; therefore, half of the 2A

- 24/48 volt battery carried the load and gradually discharged until the above rad monitor became inop.

Charger 2AB had been on standby prior to being put into service on 24/48 volt battery 2A.

When in standby-this charger experiences a high open circuit voltage which causes the high voltage shutdown (llVS) relay to shutdown the control circuitry.

The AC power light remains lit, and the battery voltage is' indicated on the voltage meter on the charger;

however, there is no load current on the ammeter.

All indications are that 24/48V char-in service with charger 2AB in standby.

gors 2A and 2B wereload on charger 2AB the IIVS relay tripped, Since there was no the control circuitry making the charger inoperabic.

The standby charger 2AB was put into service and reenergized.

Since the HVS relay was not reset the control circuitry remained inop, making the batterics carry the load until oper-ations reset the relay and returned the charger to service.

This is a nonrepetitive occurrence and procedure IINP-2-1661, 24/48 VDC Power System Charge Rotat, ion, is being revised to prevent recurrence of this event.

The proc-cdure revision will require the standby charger to be out of service and dcenergized.

Unit I will have this same type of charger installed during the present refueling outage.

For this reason procedure IINP-1-1661 is being revised to prevent occurrence of this event on Unit 1.

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