ML19250A489

LER 79-029/03L-0:on 790919,B Hydrogen Analyzer Alarms Failed to Clear,Making Detection of Sensor Failure Impossible & Resulting in Hydrogen Analyzer Inoperability.Caused by Failure of Operational Amplifier in Alarm Card

ML19250A489
Person / Time
Site:	Millstone
Issue date:	10/16/1979
From:	Bates R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19250A480	List: ML19250A479 ML19250A489
References
LER-79-029-03L-01, LER-79-29-3L-1, NUDOCS 7910230509
Download: ML19250A489 (1)

Text

NRC FOftM 3GG U. S. NUCLEAR RFGULATORY COMMISSION (7'.,

. LICENSEE EVENT REPORT CONTnOL block: l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 l l l l l lh 6

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i 8 60 61- DOCKET NUP.' deft 6'J EVEi;T DEECniPTION AND PROUABLE CONSEQUENCES h o 2 l Uh11e performing routine surveillance on the "B" hydronen analyzer. 'tqtf oment alarms I lo lal l failed t; clear, making it impossible to detect a sensor failure, and thus resulting i ITT'O l in "B" hydrogen analyzer inoperability. In accordance with technica' 19ecifications. I o s I Section 3.6.4.1, plant operations continued while the "B" analyzer failure was l o a 1 investigated and repaired. Totai time out of service for the "B" hydrogen analyzer I o 7 l was 45 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br />. I h] I I C C CODE SUDCO E COMPONENT CODE SUdC DE S DE o o lS lE l@ W@ l G l@ l Il fl l S ' T l R l U l@ l X l@ [ Zj @

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTION 0 i O l The cause of the inoperability was failure of an operational amplifier (Struthers - l Fi TTl i Dunn, Inc. , Model 12A) in the alarm card which monitors sensor signal level and g,i,i l alarms on sensor failure. The op-amp was replaced, the hydrogen analyzer surveil- l 3 3 l lance was complete' satisfactorily and the unit returned to service. l 2 4 I I 7 8 9 80 ST S  % PO'.*JE R OTHER STATUS blSCOV Y DISCOVE HY DESCRIP TION i s lE l@ l 1 l 0 l 0 l@l t1A l lBl@l Surveillance Test l A TIVIT / CO TENT RELEASED OF RELF ASE AMOUNT OF ACTIVITY LOCATION OF REL EASE l1168 9l l Zl @ Wgl 7 10 tlA 44 l l 45 t1A 80 l

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