05000321/LER-1981-095-03, /03L-0:on 810908,reactor Core Isolation Cooling Steam Line Delta P Switch Actuated at Level Outside Tech Specs Range.Caused by Setpoint Drift.Switch Recalibr.Rept Will Be Updated When Switch Is Replaced

/03L-0:on 810908,reactor Core Isolation Cooling Steam Line Delta P Switch Actuated at Level Outside Tech Specs Range.Caused by Setpoint Drift.Switch Recalibr.Rept Will Be Updated When Switch Is Replaced

ML20011A507
Person / Time
Site:	Hatch
Issue date:	10/01/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A498	List: 05000321/LER-1981-095-03, /03L-0:on 810908,reactor Core Isolation Cooling Steam Line Delta P Switch Actuated at Level Outside Tech Specs Range.Caused by Setpoint Drift.Switch Recalibr.Rept Will Be Updated When Switch Is Replaced
References
LER-81-095-03L, LER-81-95-3L, NUDOCS 8110130495
Download: ML20011A507 (2)

LER-1981-095, /03L-0:on 810908,reactor Core Isolation Cooling Steam Line Delta P Switch Actuated at Level Outside Tech Specs Range.Caused by Setpoint Drift.Switch Recalibr.Rept Will Be Updated When Switch Is Replaced

Event date:
Report date:
3211981095R03 - NRC Website

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8 60 61 DOCKET NU99E R 68 69 EVENT DATE 74 IS REPORT DAT E 80 EVENT oESCRIPTION AND PROBABLE CONSEQUENCES h l 0 l 21 l While the plant was in steady state operation at 2455 M'lt, IE51-N018,

_l 1013J l RCIC Steam Line Delta P Swi'ch, was found to actuate at 179" H20.. Tech l

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1 Specs 3.2-3, Item 10, requires acfuation at 5300% flow (159" Hp0 +18" l

10 i s j i H2O head contection).

Redundant switcle 1E51-N017 was operable.

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IO ls i I operation was not affected.

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'by this event. This is a repetitive event as last reported on Reportable 1

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Licensee: Georgia Power Company i

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Edwin I. Hatch Docket No. :

50-321

Narrative

Report for LER 50-321/1981-095.

On September 8,1981, while the plant was in steady state operation at 2435 K4t,1E51-N018, RCIC Steam Line Delta P Switch, was found to actuate at 179" H 0.

Tech Spec 3.2-3, Item 10, requires actuation at 5300% flow 2

'.159" H O +18" H O head correction).

Redundant switch IE51-N017 was 2

2 operable.

Plant operation was not affected.

Public health and safety

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was not offected by this event.

This event is repetitive as last reported on Reportable Occurrence Report No. 50-321/1981-085.

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

The instrument, a Barton Model 288, was recalibrated and returned to service. An instrument functional test was performed satisfactorily.

The instrument will be replaced as soon as parts are available. An update report will be submitted.

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