View source for 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

{{Adams
| number = ML20011A585
| issue date = 10/22/1981
| title = /03L-0:on 810929,during Testing & Calibr,Hpci Turbine Exhaust Diaphragm Pressure Switch 2E41-N0125 Found Out of Tolerance.Caused by Corrosion.Switch Replaced
| author name = Nix R
| author affiliation = GEORGIA POWER CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| docket = 05000366
| license number = 
| contact person = 
| document report number = LER-81-096-03L-01, LER-81-96-3L-1, NUDOCS 8110290136
| package number = ML20011A583
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = /03L-0:on 810929,during Testing & Calibr,Hpci Turbine Exhaust Diaphragm Pressure Switch 2E41-N0125 Found Out of Tolerance.Caused by Corrosion.Switch Replaced
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000366
| LER year = 1981
| LER number = 96
| LER revision = 3
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

=text=
{{#Wiki_filter: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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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO
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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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CODE TYPE N O.
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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-
+
Facility: Edwin I. Hatch Docket No.i 50-366 i
~
.Narrat ve Report
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<0
. fon,:LER 50-366/1981-096.
+
ca-
:- 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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