05000324/LER-1979-079-03, /03L-0:on 790831,operator Noticed Drywell Oxygen/Hydrogen Monitor Had Low Flow Condition & Indicated Abnormally.Caused by Frozen Air Dryer.Dryer de-energized & Allowed to Thaw.Dryer Inspected W/No Problem

/03L-0:on 790831,operator Noticed Drywell Oxygen/Hydrogen Monitor Had Low Flow Condition & Indicated Abnormally.Caused by Frozen Air Dryer.Dryer de-energized & Allowed to Thaw.Dryer Inspected W/No Problem

ML19208D438
Person / Time
Site:	Brunswick
Issue date:	09/25/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208D437	List: 05000220/LER-1979-079, Forwards LER 79-079/03L-0 05000324/LER-1979-079-03, /03L-0:on 790831,operator Noticed Drywell Oxygen/Hydrogen Monitor Had Low Flow Condition & Indicated Abnormally.Caused by Frozen Air Dryer.Dryer de-energized & Allowed to Thaw.Dryer Inspected W/No Problem
References
LER-79-079-03L, LER-79-79-3L, NUDOCS 7909280427
Download: ML19208D438 (2)

LER-1979-079, /03L-0:on 790831,operator Noticed Drywell Oxygen/Hydrogen Monitor Had Low Flow Condition & Indicated Abnormally.Caused by Frozen Air Dryer.Dryer de-energized & Allowed to Thaw.Dryer Inspected W/No Problem

Event date:
Report date:
3241979079R03 - NRC Website

text

NPC FORM 3G6 U. i NUCLE AR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCK ET NUMBER 68 63 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lDuring normal plant operation, the operator noticed that the drwell oxygen / hydrogen j

Imonitor, CPC-1263, had a low flow condition and was not indicating normally. Drywell l O

3 l oxygen concentration was maintained less than 47. by the CAC-1259 instrument.

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[ An investigation found that the air dryer had frozen, blocking the sample air flow.

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I1 Iil lThe dryer was deenergized and allowed to thaw, and a dry nitrogen purge was used to

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j, j7j l blow out the moisture and dry the coils. The dryer was inspected by a contract heat-l lij3; ing and air-conditioning company and no problem could be found with the dryer. The l

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NAME OF PREPARERA. C. To111 son, Jr.

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LER CONTINUATION -- RO# 2-79-079 Facility:

BSEP Unit No. 2 Event Date:

8-31-79 therefore, this is considereil an isolated event and no further action is required.

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