05000321/LER-1981-091-03, /03L-0:on 810828,while Performing HNP-1-3154 at steady-state Power,Reactor Water Level Instrument (LPCI) Ft&C,Reactor Level Indicating Switch 3 Went at 118 Inches of Water Input.Caused by Instrument Drift.Model Recalibr

/03L-0:on 810828,while Performing HNP-1-3154 at steady-state Power,Reactor Water Level Instrument (LPCI) Ft&C,Reactor Level Indicating Switch 3 Went at 118 Inches of Water Input.Caused by Instrument Drift.Model Recalibr

ML20010J177
Person / Time
Site:	Hatch
Issue date:	09/17/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010J171	List: 05000321/LER-1981-091, Forwards LER 81-091/03L-0 05000321/LER-1981-091-03, /03L-0:on 810828,while Performing HNP-1-3154 at steady-state Power,Reactor Water Level Instrument (LPCI) Ft&C,Reactor Level Indicating Switch 3 Went at 118 Inches of Water Input.Caused by Instrument Drift.Model Recalibr
References
LER-81-091-03L, LER-81-91-3L, NUDOCS 8109290668
Download: ML20010J177 (2)

LER-1981-091, /03L-0:on 810828,while Performing HNP-1-3154 at steady-state Power,Reactor Water Level Instrument (LPCI) Ft&C,Reactor Level Indicating Switch 3 Went at 118 Inches of Water Input.Caused by Instrument Drift.Model Recalibr

Event date:
Report date:
3211981091R03 - NRC Website

text

f NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT j

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSFCUENCES h r

10 W L With the plant at steady state power of 2427 MWt and while performing i

h'4P-1-3154, Reactor Water Level Instrument (LPCI) FT&C,1821-NO31A, React-l iO i3 i l

[ O ;.t i l or Level Indicating Switch, Switch No. 3 went at 118" of H 0 input. Tech l

2 10 i s t i Specs Table 3.2-2 requires actuation </= 117.2" of H 0 which is -38" re-l 2

O o l actor level. Redundant switches 1821-N031B, C and D were operable and in l

ql tolerance. There was no effect upon safe plant operation or the health l

i 3 ig i i and safety of the public. T M s is a non-repetitive event.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i 101 1 The cause of this event has been attributed tn sotonint drift. The 1

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l1 Iii l instrument, a Yarway Model 4418C, was immediately recalibrated and I

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returned to service.

No further reporting is required.

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% POWE R OTHER STATUS ISCO RY DISCOVERY DESCRIPTION [TTs'1 l_Ej@ l 1 l 0 l 0 l@l NA l

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e LL' No.: 50-321/1931-091 Licerisee: Georgia Power Company Fucility: Edwin I. Hatch Docket No. : 50-321

Narrative

Report for LER 50-321/1981-091.

i With the plant at steady state power of 2427 MWt and while performing HNP-1-3154, Reactor Water Level Instrument (LPCI) FT&C,1D21-N031A, Reactor Level Indicating Switch, Switch No. 3 actuated at 118" of water input.

s Tech Specs Table 3.2-2 requires actuation at </= 117.2" of water input t

which corresponds to -38" of water reactor level. The No. 3 contact of this switch provides a permissive to initiate HPCI.

Redundant switches l

1821-N031B, C_and 0 were operable and in tolerance. There was no effect upon safe plant operation or the health and safety of the public. This is i

a non-repetitive event.

Tu' cause of this event has been attributed to setpoint drift. The switch, i

a Yarway Model 4418C, was immediately recalibrated per HNP-1-5281, Yarway Level Switch Calibration, and returned to service.

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Unit II uses the same type of instrument' in this application; however, a generic review revealed no inherent problems.

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