05000366/LER-1980-093-03, /03L-0:on 800612,during Steady State Power, HNP-2-1050 Rounds Procedure Readings Showed Drywell Average Temp High.Caused by High Ambient Temp & Inadequate Cooling. Chilled Water Flow Increased

/03L-0:on 800612,during Steady State Power, HNP-2-1050 Rounds Procedure Readings Showed Drywell Average Temp High.Caused by High Ambient Temp & Inadequate Cooling. Chilled Water Flow Increased

ML19320D466
Person / Time
Site:	Hatch
Issue date:	07/11/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320D461	List: 05000366/LER-1980-093, Forwards LER 80-093/03L-0 05000366/LER-1980-093-03, /03L-0:on 800612,during Steady State Power, HNP-2-1050 Rounds Procedure Readings Showed Drywell Average Temp High.Caused by High Ambient Temp & Inadequate Cooling. Chilled Water Flow Increased
References
LER-80-093-03L, LER-80-93-3L, NUDOCS 8007210397
Download: ML19320D466 (3)

LER-1980-093, /03L-0:on 800612,during Steady State Power, HNP-2-1050 Rounds Procedure Readings Showed Drywell Average Temp High.Caused by High Ambient Temp & Inadequate Cooling. Chilled Water Flow Increased

Event date:
Report date:
3661980093R03 - NRC Website

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During: steady-ntate' power operation. readinos beinq taken per IINP-2-1050, I

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'145 degree F limit of Tech Spec 3.6.1.7.

There were no offects upon pub-l lic health or safety due to this event.

This is a repetitive occurr-l lTTsl: 1 l

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NARRATIVE

REPORT Georgia Power Company Plant E.

I. Hatch Baxicy, Georgia 31513 Reportable Occurrence Report No. 50-366/1980-093.

On June 12, 1980, during steady state power operation, readings being taken per UNP-2-1050, Rounds Procedure, indicated that the average drywell temper-ature was greater than the 145 degrees F limit of Tech Specs Section 3.6.1.7, (145 degrees F at 0177 CDT and 145.5 degrees F at 1610 CDT).

This event, high drywell temperature,-was due to both high ambient temeprature and in-sufficient drywell cooling capability.

The insufficient drywell cooling capability was due to the fact that two reactor building chillers are used to provide chilled water to not only the drywell, but also to the reactor and radwaste buildings.

Corrective action

consisted of throttling the chilled water going to the reactor and radwaste building coolers and thereby.ncreasing the amount of chilled water being supplied to the drywell coolers.

Also, water to coolers in room with chillers was throttled inadvertently causing chiller trip.

Chillers were i

then restarted.and water flow to room coolers increased.

.On July 2,1980, during steady state power operation, work had been completed on the reactor building 2A chiller, and the 2B chiller was taken out of service to run the 2A chiller for a check out as required following mainte-nance. During this swapping of the chillers, the average drywell temperature went above the 145 degree F limit (146.5 degrees F at 1235 CDT).

The temper-tature was back within limits af ter allowing A chiller to run following the 2

swap. -

On July 3,1980, during steady state power operation, the average drywell temperature was observed to be close to (but not above) the 145 degrees F limit. At this time, the A.E. and members of the site maintenance and engineering departments tried reducing total chilled water flow in an attempt'to gain better cooling by decreasing velocity of the coolers.

This attempt, however, proved to be unsuccessful and the average drywell temper-

.ature rose to 145.7 degrees F at 0020 CDT on July 4, 1980.

The flow was then returned to_ its original setting and the temperature dropped to below 145 degrees F.

On July 4,'1980, during steady state power operation, the average drywell temperature was observed to be 145.6 degrees F at 0900 CDT and 145.7 degrecs F at'1405 CDT.

AfterLthe high temperature at 0900 CDT, attempts were made to lower it by. running all'four sets of fan coil units in the drywell; however,

.this was' unsuccessful.

Shift-finally succeeded in lowering temperature by-throttling back on flow of chilled water to the reactor building (from 170 gpm.

to 130 gpm) and-running only 2 sets of the drywell fan coll' units.

Later temperature ; recorder 2T47-R626 was recalibrated and when readings.wcre taken

,at 1405 CDT the temperature was indicated as being high.

Investigation showed that' the ~ recorder had been incorrectly calibrated.

A' correct cali-

.bration of the recorder _showed-the temperature to be within the limits.

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. Narrative Foport Reportablo Occurrence' Report No. 50-366/1980-093 page 2-On July 7, '1980,"during steady stato power operation, the average drywell ~

temperature was observed to be 145.7 degrecs F at 1752 CDT. This high temperature was due to high. ambient temperature and it dropped back within specs as the-temperature outside; dropped.

J Onl July 8,1980, during steady stato power operation, the average drywell temperature was' observed to be 145.96 degrees F at 0845 CDT.

At that time, both of the reactor building chillers were placed into service and were paralleled.

This action corrected the temperature problem, but at 1900 CDT, the A chiller tripped and the temperature went from 140 to 147.1 degrees F.

The chiller was restarted and the temperature dropped back within specs.

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At present both reactor chillers are being run in parallel and the temper-ature is being maintained below the 145, degrees F limit of Tech Spec 3.6.1.7.

I Future.correctivo action is to consist of adding additional water chillors.

The new chillers are to be used to handle the reactor building and radwaste bulla..ng leads and the present chillers are - to be used for the drywell only.

l Completion of the chiller addition is expected prior to Cycle II operations.

There were no effects upon public health or safety due to this event.

This is.a repetitive occurrence, see LER 50-366/1980-086.

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