05000321/LER-1981-064-03, /03L-0:on 810701,HPCI Steam Line Pressure Switches 1E41-N001B & D Actuated at 101 & 106 Psig,Respectively. Caused by Switch Setpoint Drift.Switches Recalibr

/03L-0:on 810701,HPCI Steam Line Pressure Switches 1E41-N001B & D Actuated at 101 & 106 Psig,Respectively. Caused by Switch Setpoint Drift.Switches Recalibr

ML20009G367
Person / Time
Site:	Hatch
Issue date:	07/23/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G363	List: 05000321/LER-1981-064, Forwards LER 81-064/03L-0 05000321/LER-1981-064-03, /03L-0:on 810701,HPCI Steam Line Pressure Switches 1E41-N001B & D Actuated at 101 & 106 Psig,Respectively. Caused by Switch Setpoint Drift.Switches Recalibr
References
LER-81-064-03L-01, LER-81-64-3L-1, NUDOCS 8108040178
Download: ML20009G367 (2)

LER-1981-064, /03L-0:on 810701,HPCI Steam Line Pressure Switches 1E41-N001B & D Actuated at 101 & 106 Psig,Respectively. Caused by Switch Setpoint Drift.Switches Recalibr

Event date:
Report date:
3211981064R03 - NRC Website

text

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60 61 DOCK ET NUM8ER 68 69 EVENT O ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Ol2l 10n 7-1-81, with the unit in steady state power operation (2354 MWt) and I o ia i l with HNP-1-3304, HPCI Steam Line Pressure Inst'~ ument FT&C, in progress I

o 141 1 HPCI steam line cressure switches 1E41-N001B and D actuated at 101 and I

o I. j 1106 osi a, res pectivel y.

Tech Specs 3.2-2(10) reauires actuation at I

laIslIareater than or eaual to 100 + 7.3 osia static head.

Redundant switchesl i o l 71 1 1 E41-N001 A AC we re coprabin.

Plant coeration nor the health and safety 1

0181 I of the public were a f fected. This is a reDetitive event-see LER 50-321/1981-001.

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CODE SUSC E COMPONENT CODE SJ8 CODE S

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101 I The csuso nf the event was switch entonint drift.

The switches were I

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@ lrocalibrated immediatolv nor HNP 1 U74. R a r *v e. d a l o Procenro hiiteh cal _ l 121libration, and returned to service.

The unit is now in full compliance, I ti m Iand no further action or reportino is required.

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LER #:

50-321/1981-064 Licensee:

Georgia Powcr Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-064 I

On 7-1-81, with the unit in steady state power operation at 2354 MWt and with HNP-1-3304, HPCI Steam Line Pressure Instrument FTEC, in progress, HPCI steam line pressure switch-es 1E41-N001B6D actuated at 101 and 106 psig, respectively.

Item 10 of table 3.2-2 of Tech Specs requires that these switches actuate at greater than or equal to 100 + 7.3 psig static head (i.e. greater than or equal to 107.3 psig).

This is a repetitive event as last reported in LER 50-321/1981-001.

Plant operation was not affected.

There were no effects on public health or safety.

The cause of the event was switch setpoint drift.

The switch-es were recalibrated immediately per HNP-1-5279, Barksdale Pressure Switch Calibration) and returned to service.

The same type switch is used in the same application on Hatch Unit 2; however, they were successfully tested per HNP-2-3304 on 7-1-81.

The unit is now in full compliance with the requirement of item 10 of Tech Specs table 3.2-2, and neither further action nor further reporting is required.

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