05000321/LER-1980-092-03, /03L-0:on 800731,while at Steady State Power, Cooling Water to LPCI Inverter Room Cooler Was Isolated Resulting in High Ambient Temp in Inverter Room.Caused by High Ambient Temp Causing B Loop of RHR to Be Inoperable

/03L-0:on 800731,while at Steady State Power, Cooling Water to LPCI Inverter Room Cooler Was Isolated Resulting in High Ambient Temp in Inverter Room.Caused by High Ambient Temp Causing B Loop of RHR to Be Inoperable

ML19344E655
Person / Time
Site:	Hatch
Issue date:	08/29/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344E651	List: 05000321/LER-1980-092, Forwards LER 80-092/03L-0 05000321/LER-1980-092-03, /03L-0:on 800731,while at Steady State Power, Cooling Water to LPCI Inverter Room Cooler Was Isolated Resulting in High Ambient Temp in Inverter Room.Caused by High Ambient Temp Causing B Loop of RHR to Be Inoperable
References
LER-80-092-03L-01, LER-80-92-3L-1, NUDOCS 8009020414
Download: ML19344E655 (2)

LER-1980-092, /03L-0:on 800731,while at Steady State Power, Cooling Water to LPCI Inverter Room Cooler Was Isolated Resulting in High Ambient Temp in Inverter Room.Caused by High Ambient Temp Causing B Loop of RHR to Be Inoperable

Event date:
Report date:
3211980092R03 - NRC Website

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LVENT oATL 74 iS HL POf 4 T ()A I E lid EVEfJT DESCHIPTiou AND PROD ADLE CONSEcuCNCES h 10171IWhile_at steady state power the coo _ ling water to the LPCI inverter room i lcooler was isolated resulting in a high ambient temperature in the in-1 O 3 l0l4lIverter room.

The B LPCI inverter tripped making B loop of RHR inop; I

Isince the inverter supplies power to LPCI injection valve E11-F015B and 1 o s IRilR pump min flow bypass valve E11-F007B.

There was no effect on the 1

0 c l0 l71 l remaining Unit 1 & 2 inverters despite their being in the same room.

I i o ir71 IThere ~were no ef fects upon public heal th and safety.

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40 41 42 43 44 47 CAUSE oESCRIPTioN AND CORRECTIVE ACTIONS h li101IThe LPCI inverter tripped due to high amb. temp. causina B loop of RHR I

.lililIto'be inop.

Tech Specs 3.9.A.6/3.9.B.6 was performed, cooling water wasl Irestored to the inverter room cooler, and inverter was reenergized.

I i 2 i a IThis is a' recurring event - R0 80-82.

Inverter rm. chillers are being l

li i4 i l instal 1ed to al1eviate this prob 1em. Investigation should be complete by 12-1-801 7

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LER #:

50-321/1980-092 Licenrce:

Georgia Power Company Facility Name:

Edwin 1.

llatch Docket #:

50-321

Narrative

Report for LER 50-321/1980-092 On 7-31-80, the cooling water to the LPCI inverter room cooler was i s o l a t. e d resulting in a high ambient temperature in the inverter room.

The "B"

LPCI inverLer R44-S003 tripped due to this high tempercture causing "B"

loop of RlIR to become inop since this inverter supplies power to the LPCI injection valve E11-F015B and the RilR pump

' minimum flow bypass valve Ell-F007B.

The LPCI inverters for both Units 1

and 2 are located in the same room;

however, the cooling water was restored to the inverter room cooler before any of the other inverters were affected by the high temperature in the inverter room.

This is a

recurring prob 1cm with the same event occurring on 7-11-80, and reported by.RO

1. 80-82.

Inverter room chillers are presently being installed and are expected to be operational by 12-1-80.

The unit is now in full compliance with the requirements, and no further r e p o r t i~ug is required.