05000321/LER-1981-046-03, /03L-0:on 810603,reactor Water Level Switch 1B21-NO17C Found to Actuate Outside Tech Spec.Caused by Switch Setpoint Drift.Switch Recalibr

/03L-0:on 810603,reactor Water Level Switch 1B21-NO17C Found to Actuate Outside Tech Spec.Caused by Switch Setpoint Drift.Switch Recalibr

ML20005A010
Person / Time
Site:	Hatch
Issue date:	06/23/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A006	List: 05000321/LER-1981-046, Forwards LER 81-046/03L-0 05000321/LER-1981-046-03, /03L-0:on 810603,reactor Water Level Switch 1B21-NO17C Found to Actuate Outside Tech Spec.Caused by Switch Setpoint Drift.Switch Recalibr
References
LER-81-046-03L-01, LER-81-46-3L-1, NUDOCS 8106290245
Download: ML20005A010 (2)

LER-1981-046, /03L-0:on 810603,reactor Water Level Switch 1B21-NO17C Found to Actuate Outside Tech Spec.Caused by Switch Setpoint Drift.Switch Recalibr

Event date:
Report date:
3211981046R03 - NRC Website

text

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COCKET NUVBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIP! ion A*.O pro 8ABLE CoNsEOUENCES h F0Tfii uhile the olant was in cold shutdown and surveillance testing the RPS Re-1 6

'I actor Water Level Switches,1821-N017C, was found to actuate at 61" H O l

2 0 3 [Tra 1 input. Tech Spec Table 3.1-1, Item 6, re_;uires actuation at 559.95" H O l

2 [D is t l inout ecuivalent to 212.5" RPV water level.

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IO Is i I B. D were all operable.

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LER Mo.: 50-321/1981-046 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No.: 50-321

Narrative

Report for LER 50-321/1981-046 On June 3',19'81, while the plant was in cold shutdown and surveillance testing-was in progress.on the RPS Reactor Uater Level Switches,1021-N017C was found to actuate at 61" H O input.

Tech' Spec Table 3.1-1, Item 6, requires actuation at 2

559.95" H O input equivalent-to 212.5" RPV water level.

Redundant switches 2

IB21-N017A, B, D were all operable.

Plant operation was not affected.

The health and safety of the public was not affected.,

The cause of this event has been attributed to switch setpoint drift.

The

~Barton level indicating switch was recalibrated and returned to service.

The same type Barton switch is used for this service on Unit II.

A generic review revealed no inherent problems. These switches are tested monthly and the last failure an Unit I was approximately three years ago.

The unit is now in full compliance with the requirements and no further reporting is required.

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