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| {{Adams
| | #REDIRECT [[05000366/LER-1981-096-03, /03X-1:on 810929,HPCI Turbine Exhaust Diaphragm Pressure Switch 2E41-N012D Found Out of Tolerance.Caused by Corroded Switch Mechanisms.Switch Replaced]] |
| | number = ML20011A585
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| | issue date = 10/22/1981
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| | 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
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| | author name = Nix R
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| | author affiliation = GEORGIA POWER CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
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| | docket = 05000366
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| | license number =
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| | contact person =
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| | document report number = LER-81-096-03L-01, LER-81-96-3L-1, NUDOCS 8110290136
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| | package number = ML20011A583
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
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| | page count = 2
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| }}
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| {{LER
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| | 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
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| | Plant =
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| | Reporting criterion =
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| | Power level =
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| | Mode =
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| | Docket = 05000366
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| | LER year = 1981
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| | LER number = 96
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| | LER revision = 3
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| | Event date =
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| | Report date =
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| | ENS =
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| | abstract =
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| }}
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| =text=
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| {{#Wiki_filter:NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7-77)
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| LICENSEE EVENT REPORT CONTROL BLOCK: l l
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| l l
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| l l lh (PLEA *;E PRINT OR TYPE ALL REQUIRED INFORMATloN) 1 6
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| lo lil l Gl Al El Il HI 2l@l Ol Ol -l O l 0! Ol 01 O l - 10 l O l@l 4 l 1 l 1 l 1 l 11@l l
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| l@
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| 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO
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| $7 CAT 68 CON'T In l7 l9 ln l1 l@
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| loIiI lLl@l0l5l0101013l6'16 l@l0l9l2l9l8l1l@l 7 RE' 3 URC 7
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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
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| lO13l l HPCI Turbine Exhaust Diaphragm Pressure Switch Functional Test and i
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| 1014 I I Calibration, 2E41-N012D was found out of tolerance, the switch actuated I
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| l o 151 l at 12.7 psig.
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| Tech Spec Section 3.3.2-2 requires actuation at $10 psig.
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| j O s l The redundant channels were operable.
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| Plant safety was not affected nor l
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| l0l7ll the health and safety of the general public.
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| This is a repetitive event I
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| i O is i I as last reported on Reportable Occurrence Report No. 50-366/1981-073.
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| I 80 7
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| 8 9 C DE CODE SLBC E COMPONENT CODE SU8 CODE SU E
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| l C IE l@ lE l@ [lLj @ l I l N l S l T l R l U l@ [S_j@ l_Z_j @
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| O 9 7
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| 8 9
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| 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION RVENT YEAR REPORT NO.
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| CODE TYPE N O.
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| LER'HO
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| @ g l218l1l
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| [--j l019l6l l/l l0 l3 l l Ll
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| [-j l0 l 22 23 24 26 27 28 29 30 31 32 K N A ON PL NT M
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| HOURS 22 SB IT D FOR 8.
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| SUPPLIER MAN FA RER l C l@l C l@
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| 33 34 35 36 3/
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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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| i i i
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| corroded.
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| The switch was replaced.
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| The other switches were inspected i
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| 11 171 l and found to be acceptable. A generic review revealed that these type I
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| i 3 l
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| switches are used on both units, but have had no failures due to corrosion.
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| l-i 4 I
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| l 80 7
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| :- 8 9
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| * ST S
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| % POWE R OTI4ER STATUS DlS Y
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| DISCOVERY DESCRIPTION J@ l 0 l 9 l 9 l@l NA l
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| W @l Normal Surveillance l
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| i s A TIVITY CO TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE RELEASED @OF r. ELE ASE@l NA l
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| l NA l
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| [_Zj 1 6 7
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| 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPT;ON li171.Lol al ol@lz l@l NA l
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| 0 PERSONN E L INJURIES NUMBER DESCRIP TION l0!0l0l@l NA
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| _j i a 7
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| 8 9 11 12 80 L
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| OF OR DAM C TO FACILITY
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| @ (_Zj@l NA j
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| 7 8 9 10 go RIPTION @ 8110290136 811022 NRC USE ONLY [2 Lo_j l__p]l@DE
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| [ MM MOOO ISSUE l
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| NA I
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| 68 69 80 ;
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| 7 8 9 10 R. T.
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| Nix, Si'ut. of Maint.
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| pgogg
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| __ {
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| 912-367-7781 NAME OF PREPARER
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| l '-
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| x-e go -
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| I LER No.": 50-366/1981-096
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| ' Licensee: Georgia Power Company-
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| +
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| Facility: Edwin I. Hatch Docket No.i 50-366 i
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| ~
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| .Narrat ve Report
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| .c
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| <0
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| . fon,:LER 50-366/1981-096.
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| +
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| ca-
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| :- With the reactor at steady state', operation 'and performing < HNP-2-3309, z
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| HPCI Turbine Exhaust Diaphragm; Pressure Switch = Functional Test and ~
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| Calibration, 2E41-N012D was foundrout of tolerance,'the switch' actuated at 12.7'psig.
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| Tech ~ Spec-Section 3.3.2-2? requires' actuation.at $10;psig'.,
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| 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.
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| 4
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| :- The' cause of this event has been attributed -to the switch' and its mechanisms being corroded.
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| The switch was repla cJ. :The corrosion = problem can be-F attributei to the environment in.which'the switch is mounted, which is;
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| ~
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| 1 high temperature and high humidity surroundings. The'other switche:,
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| 2E41-N012A, B and C were inspected and at'present~ have no corrot on' problem.
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| 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
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| switches withia trip and analog unit, or some other more reliable type
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| ,~
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| instrument. A follow-up report will tua s.ubmitted when results of the.
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| investi-ation are obtained.
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| ')
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| }}
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| {{LER-Nav}}
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