ML19269E552

LER 79-013/03L-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

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: ML19269E542 ML19269E552
References
LER-79-013-03L-01, LER-79-13-3L-1, NUDOCS 7906290269
Download: ML19269E552 (1)

Text

NRC PORM 366 U. S. NUCLEAR REGULATORY COMMISSION mm -

. LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 9 l Cl Tl M l N I S l1421@l UCENSEE CODE :S 0 l 0 l- 1010 l 01010 l- l01025 l@l411 LICENSE NLMSER 26 Il 11TYPE UCENSE 11JGl@l$7 CAT l

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7 3 60 61 e8 69 EVENT OATE 14 75 REPORT DATE NUM8ER EVENT CESCRIPT1oN AND PROBA8LE CONSEQUENCES h 0i2i l Following a periodic check of the control room chlorine detection system, both l 0 3 detectors were declared inoperable due to having low drip rates in the sentir l 0,A assembly. The control room emergency ventilation system was immediately placed in l 0i3 i the recirculation mode in accordance with technical specifications section 3.3.3.6, l 0 ,a 1 action statement b. Following sensor cleaning the detectors were returned to service !

Oi7 i and the ventilation system was restored to normal. i Jld l  !

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

, ,2 ]were cleaned, restoring proper drip rate and returning both detectors to operability. I i, 2 i Frequency of drip rate checks will be increased to daily to prevent a similar I

,4 irecurrence. l 7 3 3 30 ST  % PCWER OTHER STATUS is O RY OISCOVERY OESCRIPTION Operator Observation i i3 El @ l 0l 5 0l@l NA l l8l@l l ACTIVITY CO TENT

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