05000321/LER-1981-086-03, /03L-0:on 810809,noble Gas Monitor 1D11-K622 Found Inoperable in Calibr Mode.Caused by Failure of Oscillator Circuit on Power Supply Board.Oscillator Circuit Replaced

/03L-0:on 810809,noble Gas Monitor 1D11-K622 Found Inoperable in Calibr Mode.Caused by Failure of Oscillator Circuit on Power Supply Board.Oscillator Circuit Replaced

ML20010E954
Person / Time
Site:	Hatch
Issue date:	08/27/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010E952	List: 05000321/LER-1981-086, Forwards LER 81-086/03L-0 05000321/LER-1981-086-03, /03L-0:on 810809,noble Gas Monitor 1D11-K622 Found Inoperable in Calibr Mode.Caused by Failure of Oscillator Circuit on Power Supply Board.Oscillator Circuit Replaced
References
LER-81-086-03L, LER-81-86-3L, NUDOCS 8109090179
Download: ML20010E954 (2)

LER-1981-086, /03L-0:on 810809,noble Gas Monitor 1D11-K622 Found Inoperable in Calibr Mode.Caused by Failure of Oscillator Circuit on Power Supply Board.Oscillator Circuit Replaced

Event date:
Report date:
3211981086R03 - NRC Website

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 E,'ENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 1012ll With the reactor at steadv state power and while performina HNP-1-3057.

I o 3 L Fission Product Monitor Functional Test and Calibration, it was found I

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that 1011-K633, Noble Gas Monitor, was inop in the calibrate mode. Tech l

I IOlsl l Specs Section 3.2-10 requires one operable channel.

1D11-K631, Particu-

_J l0 l6 l l late Monitor, was also inop.

The health and safety of the public was i

10171 I not affected. This is a repetitive event as last reported on Reportable l

l O ia i I Occurrence Report No. 50-321/1980-119.

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J3 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l

The reason that ID11-K633, Noble Gas Monitor. was inoo was due to the i

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oscillator circuit failina on the power supply board. The oscillator I

i, i,i l circuit was replaced, ID11-K633 was returned to service and HNP-1-3057, l

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Fission Product Monitor Functional Test and Calibration, was performed I

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with satisfactory results.

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'LER No.:

50-321/1981-086 Licensee: Georgia Power Company Facility: Edwin I. Hatch.

l Docket No.: 50-321

. Narrative Report,

for LER 50-321/1981-086.

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With the reactor at steady state power and while oerforming HNP-1-3057, Fission Product tbnitor Functional' Test and Calibration, it was found that 1011-K633, Noble Gas Monitor, was finop in the calibrate mode.

Tech 7

Specs Section 3.2-10 requires one operable channel. 1011-K631, Particu-late Monitor, was also inop.

The health and safety of the public was not affected. This is a repetitive event as last reported on Reportable L.

Occurrence Report No. 50-321/1980-119.

l The reason tnat ID11-K633, Noble Gas Monitor, was inop was fdue to the -

oscillator circuit failing on the power supply board.

The oscillator o

circuit was replaced and ID11-K633 was returned to service. HNP-1-3057,

. Fission Product Monitor Functional Test and Calibration, was performed with satisfactory results.

Unit I and Unit II uses the same type: monitor,-

but a generic review revealed no inherent problems.

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