ML20010H533

LER 81-143/03L-0:on 810821,periodic Spurious Alarms Annunciated,Resulting in Inoperability of Radiation Monitor for Control Room Outside Air Intake.Caused by Vacuum Pump Tripped Off Due to High Sys Vacuum & Dirty Prefilter

ML20010H533
Person / Time
Site:	McGuire
Issue date:	09/18/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H532	List: ML20010H531 ML20010H533
References
LER-81-143-03L, LER-81-143-3L, NUDOCS 8109240592
Download: ML20010H533 (1)

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,2. IWhile in mode 2, the radiation monitor for the Contrcl Room outside air intake,

, , ,, 9 (EMF-43A) was declared inoperable due to periodic, spurious alarms. This vio-io..;11ates T.S. 3.3.3.1 which is reportable pursuant to T.S, 6.9.1.13(b). Because o{

,, ,,,,the availability of the redundant EMF-43B monitor, in addition to no radioac-

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,,,o;l Examination of the monitor found that its vacuum pump had tripped off, appar ;

,, ,,,,ently caused by high system vacuum. The alarms were apparently caused by dirt ,

,, ,,,gaccumulation on the monitor's pre-filter, attributable to a greater number of ,

,,, , personnel entering the Control Room recently due to plant start-up. The filter,

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