05000325/LER-1979-049-03, /03L-0 on 790724:drywell 0-2 Monitor Air Dryer Showed -1259 Reading During Normal Operation After Routine Preventive Maint.Caused by Ice Buildup on Chiller Coils Resulting in Reduced Sample Flow

/03L-0 on 790724:drywell 0-2 Monitor Air Dryer Showed -1259 Reading During Normal Operation After Routine Preventive Maint.Caused by Ice Buildup on Chiller Coils Resulting in Reduced Sample Flow

ML19207B323
Person / Time
Site:	Brunswick
Issue date:	08/21/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19207B319	List: 05000325/LER-1979-049, Forwards LER 79-049/03L-0 05000325/LER-1979-049-03, /03L-0 on 790724:drywell 0-2 Monitor Air Dryer Showed -1259 Reading During Normal Operation After Routine Preventive Maint.Caused by Ice Buildup on Chiller Coils Resulting in Reduced Sample Flow
References
LER-79-049-03L-01, LER-79-49-3L-1, NUDOCS 7908240412
Download: ML19207B323 (2)

LER-1979-049, /03L-0 on 790724:drywell 0-2 Monitor Air Dryer Showed -1259 Reading During Normal Operation After Routine Preventive Maint.Caused by Ice Buildup on Chiller Coils Resulting in Reduced Sample Flow

Event date:
Report date:
3251979049R03 - NRC Website

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LICENSEE EVENT REPORT

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI 1

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7 8 9 LICENSELCODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 5 7 C A.* $8 CON'T lL@l0 5 l 0 l - l 0 l 3 l 2 l 5 @l O l 71 2 l 4 l 7 l 9 l@l 0 g 8 l 2 ) 1 l 7 9g 0

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8 60 61 DOCKET NUMBER 6d 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o

2 lDuring normal operation after routine preventive maintenance had been performed on theI o

3 ldrywell 07 monitor CAC-ATH-1259 air dryer, the operator noticed that the -1259 reading l o

4 [was erratic. A check of the instrument indicated low sample f'.ow.

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5 l Technical Specification 3.6.6.4, 6.9.1.9b 0

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8 9 80 SYSTEM

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9 10 11 12 13 18 19 20 SEQUE NTI A L OCCURRENCE REPORT REVISION LE R r RO EVENT YEAR REPORT NO.

CODE TYPE NO.

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36 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Phile the air was secured for maintenance, moisture in the sir dryer condensed on the I i

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[ inner surface of the chiller coils and froze when the drver was energized. As more I

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,, ;,i jmoisture passed through the chiller, a larger ice buildup resulted thus reducing samnlel jflow. The coils were tSaved out and the system returned to normal. A revision to the i

3 periodic maintenance procedure is being written to purge the dryer coils before (CON'T)1 i

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% POWE R OT14ER STATUS IS O 6RY OfSCOVERY DESCRIPTION R lE l@ l 0 9 l 9 l@l NA l

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7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

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PEPSONNEL INJURIES NUMBER

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NAME OF PREPARER PHONE:

1.ER CONTINUATION - RO# 1-79-049 Facility:

BSEP Unit No. 1 Event Date:

07-24-79 starting to insure no moisture is present.

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