05000325/LER-1981-044-03, /03L-0:on 810330,drywell Oxygen Concentration Analyzer 1-CAC-AT-1259-2 Tripped & Would Not Remain Running When Restarted.Caused by Analyzer Sample Vacuum Pump Failure Due to Excessive Moisture Buildup in Lines

/03L-0:on 810330,drywell Oxygen Concentration Analyzer 1-CAC-AT-1259-2 Tripped & Would Not Remain Running When Restarted.Caused by Analyzer Sample Vacuum Pump Failure Due to Excessive Moisture Buildup in Lines

ML19345G829
Person / Time
Site:	Brunswick
Issue date:	04/16/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345G827	List: 05000325/LER-1981-044, Forwards LER 81-044/03L-0 05000325/LER-1981-044-03, /03L-0:on 810330,drywell Oxygen Concentration Analyzer 1-CAC-AT-1259-2 Tripped & Would Not Remain Running When Restarted.Caused by Analyzer Sample Vacuum Pump Failure Due to Excessive Moisture Buildup in Lines
References
LER-81-044-03L-01, LER-81-44-3L-1, NUDOCS 8104220457
Download: ML19345G829 (2)

LER-1981-044, /03L-0:on 810330,drywell Oxygen Concentration Analyzer 1-CAC-AT-1259-2 Tripped & Would Not Remain Running When Restarted.Caused by Analyzer Sample Vacuum Pump Failure Due to Excessive Moisture Buildup in Lines

Event date:
Report date:
3251981044R03 - NRC Website

text

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OOCKETNuv5ER 68 69 EVENT DATE 14 75 REPCRT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[,,o_L2,,j lWhile performing normal unit recovery operations followinz a reactor scram the drvwelll FTTl I oxygen concentration analyzer,1-CAC-AT-1259-2, tripped and would not remain running l

io i4l lwhen restarted. The analyzer was then declared inoperable in accordance with technicall l o I s l l specifications and placed under clearance for repairs This event did not affect the l UTin t health or safety of the public.

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3 40 43 42 43 44 47 CAUSE DESCRIPTION AND CGRRECTIVE ACTIONS l i l o l [Ihis event occurred because the analyzer sample vacuum pump, Model No. PCD-10. failed l

Idue to excessive moisture builduo in the analyzer sample lines. The numo was reolaced l i,

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,,,3, l calibration and returned to service. These analyzers will be replaced with others of l g ga more reliable design u tring a future outage.

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a LER A*ITACHMENT - RO #1-81-44 Facility: BSEP Unit No.1 Event Date: 3-30-81 This event occurred as a result of excessive moisture buildup in the analyzer sample lines that caused the failure of the analyzer vacuum sample pump. As presently installed, this type CAC monitor analyzer utilizes sample piping that tends to allow a moisture buildup in the monitor components and within the line itself. The sample lines to these monitor analyzers are presently blown down on a weekly basis to remove any moisture accumulation that could lead to problems affecting the operation of these monitors.

Due to a history of various events resulting from sample flow moisture problems, a plant =odification has been developed to replace these type monitors with others of a more reliable design that will utill e a different sample piping design.

This will help eliminate moisture buildup problems. The monitors presently in use will be replaced with these specified in the modification, following their receipt, during the next unit outage of sufficient length as to allow their inscallation. They are currently scheduled to arrive on site in August 1981.

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