05000325/LER-1979-045-03, /03L-0 on 790622:during Normal Operator Surveillance of Control panels,CAC-ATH-1263-2 Indicated Drywell Oxygen Greater than 4% & Was Erratic.Caused by Corrosion Buildup in Exhaust Check Valve.Instrument Calibr

/03L-0 on 790622:during Normal Operator Surveillance of Control panels,CAC-ATH-1263-2 Indicated Drywell Oxygen Greater than 4% & Was Erratic.Caused by Corrosion Buildup in Exhaust Check Valve.Instrument Calibr

ML19225B253
Person / Time
Site:	Brunswick
Issue date:	07/18/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19225B250	List: 05000325/LER-1979-045, Forwards LER 79-045/03L-0 05000325/LER-1979-045-03, /03L-0 on 790622:during Normal Operator Surveillance of Control panels,CAC-ATH-1263-2 Indicated Drywell Oxygen Greater than 4% & Was Erratic.Caused by Corrosion Buildup in Exhaust Check Valve.Instrument Calibr
References
LER-79-045-03L-01, LER-79-45-3L-1, NUDOCS 7907240363
Download: ML19225B253 (2)

LER-1979-045, /03L-0 on 790622:during Normal Operator Surveillance of Control panels,CAC-ATH-1263-2 Indicated Drywell Oxygen Greater than 4% & Was Erratic.Caused by Corrosion Buildup in Exhaust Check Valve.Instrument Calibr

Event date:
Report date:
3251979045R03 - NRC Website

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[During_normaLopera tor _aurycillance_oL_the_contro l panels,_the_ _op erator_no ticed that (the CAC-ATH-1263-2 was indicating _draywell oxyge.n14 7., and was erratic. From a cali-1 lo 3

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cr usr DEscnir rio ; Ano cmne c rt'. e. :rio <. (y) i o lAn inspection four.d that cabinet temperature was 190 F vice the normal 130 F+ 2. Thel [e xhau s t check valve was found stuck g artially closed due to corrosion buildup.

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LER CONTINUATION -- RO# 1-79-045 Facility:

BSEP Unit No. 1 Event Date:

6-22-79 observed as normal. The maintenance instruction will be revised to check the exhaust check valve for proper operation. This is considered an isolated event and no further action is required.

368 174