05000321/LER-1980-082-03, /03L-0:on 800711,during Startup,Cooling Water to LPCI Inverter Room Cooler Was Isolated on Two Occasions,Lpci B Inverter Tripped,Making Loop B of RHR Inoperable.Caused by High Ambient Temp in Inverter Room.Inverter re-energi

/03L-0:on 800711,during Startup,Cooling Water to LPCI Inverter Room Cooler Was Isolated on Two Occasions,Lpci B Inverter Tripped,Making Loop B of RHR Inoperable.Caused by High Ambient Temp in Inverter Room.Inverter re-energized

ML19330B530
Person / Time
Site:	Hatch
Issue date:	07/30/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19330B529	List: 05000321/LER-1980-082, Forwards LER 80-082/03L-0 05000321/LER-1980-082-03, /03L-0:on 800711,during Startup,Cooling Water to LPCI Inverter Room Cooler Was Isolated on Two Occasions,Lpci B Inverter Tripped,Making Loop B of RHR Inoperable.Caused by High Ambient Temp in Inverter Room.Inverter re-energi
References
LER-80-082-03L-01, LER-80-82-3L-1, NUDOCS 8008040141
Download: ML19330B530 (2)

LER-1980-082, /03L-0:on 800711,during Startup,Cooling Water to LPCI Inverter Room Cooler Was Isolated on Two Occasions,Lpci B Inverter Tripped,Making Loop B of RHR Inoperable.Caused by High Ambient Temp in Inverter Room.Inverter re-energized

Event date:
Report date:
3211980082R03 - NRC Website

text

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60 61 OOCKET NUMBER 6J 63 EVENT DATE 74 7b REPORT DAT E 80 EVENT DESCRIPTloN ANo PROBADLE CONSEQUENCES h 1012l10uring startup of Unit 1 the cooling water to the LPCI inverter room i

l cooler was isolated on 2 occasions resulting in a high ambient temperat-l O 3 lure in the inverter room.

The B LPCI inverter tripped making B loop of l O 4 i_lO lsi lRHR inop; since the inverter supplies power to LPCI injection valve Ell-l lOlcllF0158 and RHP, pump min flow bypass viv. E11-f007B.

There was no effectl 0 7 lon the remaining Unit 1 & 2 inverters despite their being in the same l

10181 t room.

There were no effects upon public health and safety.

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11111lin the inverter room.

The loss of this inverter caused RHR B loop to bel i 2 linop.

TS 3.9.B.6 was performed, cooling water was restored to the inver-1 iter room cooler, and inverter was reenergized.

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NAME /)F PREPARER C-l

LER #:

50--321/1980-082 Licensec:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1980-082 On two separate occasions on 7-11-80, the cooling water to the isolated resulting in a high LPCI inverter room cooler was ambient temperature in the inverter room.

The "B"

LPCI inverter R44-S003 tripped due to this high ambient temperature causing "B"

loop of RHR to become inoperable due to loss of power to the LPCI injection valve Ell-F015B and the RHR pump minimum flow bypass valve Ell-F007B.

The 1PCI inverters for both Units 1 and 2 are located in the same roon; however, the restored to the inverter room cooler before affected' by high ambient cooling water was any of the other inverters were temperature in the inverter room.

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