ML19340E221

LER 80-121/03L-0:on 801211,all Points of 1T47-RG11,drywell Temp Recorder,Were Reading Higher than Redundant Recorder 1T47-R612.Caused by Faulty Slide Wire Contacts & Printhead Mechanism.New Parts Installed

ML19340E221
Person / Time
Site:	Hatch
Issue date:	12/30/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340E211	List: ML19340E210 ML19340E221
References
LER-80-121-03L, LER-80-121-3L, NUDOCS 8101060669
Download: ML19340E221 (2)

Text

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REPORT DATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lo l2l l With the plant in steady operation at 1942 MWT, all points of IT47-R611,I

[O ;3 ; ; D rywel l Temperature Recorder, were found to be reading higher than l Io l4i l redundant recorder IT47-R612. Tech Spec 4.2-1 requires two operable l lo isl l instrument channels. The unit was placed in a 30 day limiting conditiong la ls l l of operation as a result of this event. This a repetitive event as last lol71l reported on~ Reportable Occurrence Report No. 50-321/1980-75. The health i o m i l and safety of the public was not af fected by this event. I 7 8 9 80 SYSTEV CAUSE CAUSE COVP. VALVE CODE CODE SUBCOCE COUPONENT CODE SUBCODE SUBCODE l0l9] l I l Dl@ lE l@ l 8 l@ [I l Nl S l Tl R l Ul@ {@ y @

10 18 20 1 8 9 11 12 13 19 SEQUE NTI AL OCCURRENCE REPORT REVISION LE EVENTYEAR REPORT NO. CODE TYPE NO, O aj,;Ro,1 HO 1 8101 l_I 11 12l Il l/l l 01 31 l Ll 30 l-l l0l 32

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33 J4 35 36 3/ 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li lol l The cause of this event has been attributed to faulty slide wire con- l lilijitacts and printhead mechanism. New parts were installed, the instrumenq i,i,,,Iwas recalibrated and returned to service. Because of the poor relia- l l i,i,i l bility of this recorder, a design change has been implemented to re- l l

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• s LER No.: 50-321/1980-121 Licensee: Georgia Power Company Facility Name: Edwin I. Hatch Docket No.: 50-321 Narrative Report for LER 50-321/1980-121 With the plant in steady operation at 1942 MWT, all points of IT47-R611, Drywell Temperature Recorder, were found to be reading higher than redundant recorder IT47-R612. Tech Spec 4.2-1 requires two operable instrument channels.

The unit was placed in a 30 day limiting condition of operation as a result of this event. This is a repetitive event as last reported on Reportable Occur-rence No. 50-321/1980-75. The health and safety of the public was not affected by this event.

The cause of this event has been attributed to faulty slidewire contacts and printhead mechanism. New parts were installed and the instrument was recali-brated and returned to service. Because of the poor reliability of this re-corder, a design change has been implemented to replace it with a more reli-able instrument.

The generic review did not reveal any inherent problems. Unit II does not use this type of recorder.

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