ML19273B564

LER 79-007/03L-0 on 790228:both Control Room Chlorine Detection Sys Declared Inoperable.Caused by Improper Calibr of Detectors Due to Use of Inaccurate Calibr Gas.Sys Returned to Svc After Recalibr

ML19273B564
Person / Time
Site:	Millstone
Issue date:	03/30/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19273B559	List: ML19273B557 ML19273B564
References
LER-79-007-03L-01, LER-79-7-3L-1, NUDOCS 7904090173
Download: ML19273B564 (1)

Text

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LICENSEE EVENT REPORT .

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y l Following a scheduled surveillance on the control roon chlorine detection system y ; both systens were declared inoperable when the detectors failed calibration g

The control roon emergency ventilation system was immediately placed E L procedures.

ifications j in the recirculation mode of operation in accordance with Technical Spec g(

Following recalibration, the detectors were g [ Section 3.3.3.6 action statenent b.

[7] l returned to service and control roon ventilation restored to normal.

l 60 Ta~1 1 COY P. VALVE SYSTEM CAUSE CAUSE SUSCOOf Su s CO D c.

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33 34 l3SZ ]@ 26 31 40 41 42 43 CAUSE DESCRIPTION AND CONNECTIVE ACTIONS h l o l The detectors were declared out of calibration as a result of using inaccurate Recalibration using new calibration gas restored the detectors 1, j l calibration gas.

The cause of the gas inaccuracy is not known at this tine and  ;

,,73l to operable status.

the container has been returned to the vendor for analysis. Results will be j

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j i ., i included in an update report. 80 8 9 bl5CO Y DISCOVERY DESCRIPTION

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