05000366/LER-1981-096-03, /03L-0:on 810929,during Testing & Calibr,Hpci Turbine Exhaust Diaphragm Pressure Switch 2E41-N0125 Found Out of Tolerance.Caused by Corrosion.Switch Replaced

/03L-0:on 810929,during Testing & Calibr,Hpci Turbine Exhaust Diaphragm Pressure Switch 2E41-N0125 Found Out of Tolerance.Caused by Corrosion.Switch Replaced

ML20011A585
Person / Time
Site:	Hatch
Issue date:	10/22/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A583	List: 05000366/LER-1981-096, Forwards LER 81-096/03L-0
References
LER-81-096-03L-01, LER-81-96-3L-1, NUDOCS 8110290136
Download: ML20011A585 (2)

LER-1981-096, /03L-0:on 810929,during Testing & Calibr,Hpci Turbine Exhaust Diaphragm Pressure Switch 2E41-N0125 Found Out of Tolerance.Caused by Corrosion.Switch Replaced

Event date:
Report date:
3661981096R03 - NRC Website

text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l l lh (PLEA *;E PRINT OR TYPE ALL REQUIRED INFORMATloN) 1 6

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT oESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l With the Reactor at steady state operation and performino HNP-2-3309, I

lO13l l HPCI Turbine Exhaust Diaphragm Pressure Switch Functional Test and i

1014 I I Calibration, 2E41-N012D was found out of tolerance, the switch actuated I

l o 151 l at 12.7 psig.

Tech Spec Section 3.3.2-2 requires actuation at $10 psig.

j O s l The redundant channels were operable.

Plant safety was not affected nor l

l0l7ll the health and safety of the general public.

This is a repetitive event I

i O is i I as last reported on Reportable Occurrence Report No. 50-366/1981-073.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l0 l l The cause_has been attrib 1ted to the switch and its mechanisms being i

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corroded.

The switch was replaced.

The other switches were inspected i

11 171 l and found to be acceptable. A generic review revealed that these type I

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switches are used on both units, but have had no failures due to corrosion.

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912-367-7781 NAME OF PREPARER

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I LER No.": 50-366/1981-096

' Licensee: Georgia Power Company-

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Facility: Edwin I. Hatch Docket No.i 50-366 i

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.Narrat ve Report

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. fon,:LER 50-366/1981-096.

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- With the reactor at steady state', operation 'and performing < HNP-2-3309, z

HPCI Turbine Exhaust Diaphragm; Pressure Switch = Functional Test and ~

Calibration, 2E41-N012D was foundrout of tolerance,'the switch' actuated at 12.7'psig.

Tech ~ Spec-Section 3.3.2-2? requires' actuation.at $10;psig'.,

C The-! redundant channels were operable.7 Plant safety was not affected. nor was the health and ' safety'of the general;public.4;This;is.-a repetitive' event as last reported on Reportable Occurrence Report 50-366/1931-073.

4

- The' cause of this event has been attributed -to the switch' and its mechanisms being corroded.

The switch was repla cJ. :The corrosion = problem can be-F attributei to the environment in.which'the switch is mounted, which is;

~

1 high temperature and high humidity surroundings. The'other switche:,

2E41-N012A, B and C were inspected and at'present~ have no corrot on' problem.

i These switches also have been prone to' drift andithe ' environment could be a' major factor. An. investigation is underway to possibly. change out these L

switches withia trip and analog unit, or some other more reliable type

,~

instrument. A follow-up report will tua s.ubmitted when results of the.

investi-ation are obtained.

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