05000321/LER-1981-074-03, /03L-0:on 810720,main Stack Offgas Flow Recorder Found Inoperative.Caused by Component Failure Due to Several Transistor Failures in Each Flow Measuring Unit.Components Replaced & Units Recalibr

/03L-0:on 810720,main Stack Offgas Flow Recorder Found Inoperative.Caused by Component Failure Due to Several Transistor Failures in Each Flow Measuring Unit.Components Replaced & Units Recalibr

ML20010A967
Person / Time
Site:	Hatch
Issue date:	08/06/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010A964	List: 05000321/LER-1981-074, Forwards LER 81-074/03L-0 05000321/LER-1981-074-03, /03L-0:on 810720,main Stack Offgas Flow Recorder Found Inoperative.Caused by Component Failure Due to Several Transistor Failures in Each Flow Measuring Unit.Components Replaced & Units Recalibr
References
LER-81-074-03L, LER-81-74-3L, NUDOCS 8108130172
Download: ML20010A967 (2)

LER-1981-074, /03L-0:on 810720,main Stack Offgas Flow Recorder Found Inoperative.Caused by Component Failure Due to Several Transistor Failures in Each Flow Measuring Unit.Components Replaced & Units Recalibr

Event date:
Report date:
3211981074R03 - NRC Website

text

NRC FORM 360 U.S. NUCLEAR REGULATORY COMMISS!ON (7-7 H LICENSEE EVENT REPORT P

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h O 2 l With the unit in steady state operation at 2328 MWt, the Main Stack Off-I [O i3 i i gas Flow Recorder was found inoperative.

Environmental Tech Specs Section l

1014 l l 1.1.4.b reauires continuous monitoring of Stack Gas Flow.

Plant operation l

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The health and safe-l 10 le l I ty of the public was not affected.

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F6TT1 I reported on Reportable Occurrence Report No. 50-321/1979-084.

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LER No.: 50-321/1981-074 Licensee: Georgia Power Company Facility: Plant E. I. Hatch Docket No. : 50-321

Narrative

Report for LER 50-321/1981-074.

With the unit in steady state operation at 2328 MWt, the Main Stack Off-gas Flow Recorder,1D11-R625, was found inoperative. Environmental Tech Specs Section 2.1.4.b requires continuous monitoring of Stack Gas Flow.

Plant operation was placed in a 7 day LC0 as a result of this event. The health and safety of the public was not affected.

This is a repetitive event as last reported on Reportable Occurrence Report No. 50-321/1979-084.

The cause of this event has been attributed to component failure. The failure was due to several transistor failures in each flow measuring unit. The components were replaced, the flow units recalibrated and returned to service.

The circumstance leading to this event was a severe lightning storm.

It is believed that lightning struck the stack and damaged the components.

A generic review of this event revealed no inherer.t problems.

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