ML20126D047

RO-50-366/1980-031:on 800327,during Cold Shutdown,While Performing 18-month Surveillance,Battery Charges 2A,2B & 2C Were Unable to Maintain Loading Requirements.Caused by SCRs & Current Limiting Modules Being Out of Adjustment

ML20126D047
Person / Time
Site:	Hatch
Issue date:	03/28/1980
From:	Manry M GEORGIA POWER CO.
To:
References
NUDOCS 8004150410
Download: ML20126D047 (2)

Text

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I 01 9AXLEI, GEORGIA 11413 PMS HR. JAMES P. O'REILLY

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yj DIRECTOROFINSPECTIONANDENFORCtMENT}Ij,q)f,p,r.g, 1

0'lITED STATEM NUCLEAR REGUL ATORY COMIL F r "' ' t '.

REGION II

.90ITE 3100 f

10f MARIETTA STREET

,01M M gg. 0 3 i

ATLANTA, CEORGIA 30303 i

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SUBJECT:

Hatch Unit 2, Docket No. 50 *466, Notificati$n of Reportable Occurrence No. 50-366/1980-011.

WOTIFIED:

NRC Operations Center

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.DATE:

3426 80 D AT8::

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2210 CST l

DESCRIPTION OF REPORTABLE OCCURREtiC5:

Initial Condition At the time of the occurrenco Unit ? was in cold shutdown in ordea to perform 1R month surveillance requirements and the vent header j.

deflector modification, i

l Nature of Occurrence l

While perfoami'ig the 1B nonth suaveillance on atetton hatte"y chnar,es 94 SB, and 70, the charSers vera unabla to maintain the loading requirements per Tech Spac.

h.9.?.'.9.c.'.

The Leading acquiae'sents are to maintain greater than o-eq':ai, to 1100 amps for greater than or equal to h hours at greater than or equal to 12c VoitS DC.

In-ndiate Corrective Action Issued 'iaintenance Request to repata station chaagers 2A, 2B, and SC.

Cause SCR's were out of adjustn*nt as wal) as the cuarent 11 54 ting module.

Sunclemental Coarectiva Action

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SCR's were adjusted to, caary the loads applied to the cha*geam i

eveniv, and the current limit was aaised to allow the chargeas to I

waintain the required load.

Status of Radiandant oa Mackun.tystar.s-Station battery PA is fully charged and capable of carrying nove.41 and emergency londa.

f Mtation hattery chmaners ?A and' 2D have passed their ' suave 111anc e requirements in the interin between, the occurrence and this telegras, l

making the battery chargers operable.,

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Innact to Other Unit ll The chargers on Uni.t 1 are

4. den t ical to 'those on Unit P.

Investigation is in proscess to determine the opplicablity of 4

I the probles to Unit 1.

Justifiestion for Continue 4 Operation Continued ope-ation is.19stified in that the ehaagers laae onpable of recharging the hattery and caerying nornp1 totds, add the battery is ful.ly charged capable ' of omeying the game e

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