05000336/LER-1979-013-03, /03L-0 on 790525:during Check of Control Room Chlorine Detection Sys,Both Detectors Declared Inoperable Due to Low Drip Rates in Sensor.Caused by Clogged Dispensers.Dispensers Cleaned,Restoring Operability

/03L-0 on 790525:during Check of Control Room Chlorine Detection Sys,Both Detectors Declared Inoperable Due to Low Drip Rates in Sensor.Caused by Clogged Dispensers.Dispensers Cleaned,Restoring Operability

ML19269E552
Person / Time
Site:	Millstone
Issue date:	06/22/1979
From:	Bates R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269E544	List: 05000336/LER-1979-013, Forwards LER-79-013/03L-0 05000336/LER-1979-013-03, /03L-0 on 790525:during Check of Control Room Chlorine Detection Sys,Both Detectors Declared Inoperable Due to Low Drip Rates in Sensor.Caused by Clogged Dispensers.Dispensers Cleaned,Restoring Operability
References
LER-79-013-03L-01, LER-79-13-3L-1, NUDOCS 7906290269
Download: ML19269E552 (1)

LER-1979-013, /03L-0 on 790525:during Check of Control Room Chlorine Detection Sys,Both Detectors Declared Inoperable Due to Low Drip Rates in Sensor.Caused by Clogged Dispensers.Dispensers Cleaned,Restoring Operability

Event date:
Report date:
3361979013R03 - NRC Website

text

NRC PORM 366 U. S. NUCLEAR REGULATORY COMMISSION mm LICENSEE EVENT REPORT CONTROL BLOCK: l I

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7 8 9 UCENSEE CODE 14

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60 61 OCCKET NUM8ER e8 69 EVENT OATE 14 75 REPORT DATE 80 EVENT CESCRIPT1oN AND PROBA8LE CONSEQUENCES h 0i2i l Following a periodic check of the control room chlorine detection system, both l

detectors were declared inoperable due to having low drip rates in the sentir l

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0,A assembly. The control room emergency ventilation system was immediately placed in l

the recirculation mode in accordance with technical specifications section 3.3.3.6, l

0i3 i 1 action statement b.

Following sensor cleaning the detectors were returned to service !

0,a Oi7 i and the ventilation system was restored to normal.

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33 54 35 06 37 40 41 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS t to 1The detectors were declared inocerable due to low drio rates of detector solution anto the sensor assembly. The low drio rates were due to clogged dispensers which i

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]were cleaned, restoring proper drip rate and returning both detectors to operability. I

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2 i Frequency of drip rate checks will be increased to daily to prevent a similar I

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