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| {{Adams
| | #REDIRECT [[05000321/LER-1980-023-03, Hpic Did Not Actuate Until Tech Spec Limit Passed.Caused by Instrument Drift. Switches Calibr & Necessary Design Changes Will Be Implemented]] |
| | number = ML19312D182
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| | issue date = 03/10/1980
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| | title = /03L-0:on 800224,during Startup W/Mode Switch in Startup & Hot Standby,Hpci Sys Did Not Become Operational at 133 Psig Per Tech Specs.Caused by Design Deficiency & Instrument Drift.Pressure Switches Recalibr
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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 = 05000321
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| | license number =
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| | contact person =
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| | document report number = LER-80-023-03L-01, LER-80-23-3L-1, NUDOCS 8003210416
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| | package number = ML19312D181
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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 800224,during Startup W/Mode Switch in Startup & Hot Standby,Hpci Sys Did Not Become Operational at 133 Psig Per Tech Specs.Caused by Design Deficiency & Instrument Drift.Pressure Switches Recalibr
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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 = 05000321
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| | LER year = 1980
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| | LER number = 23
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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:IC t
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| LICENSEE EVENT REPORT g
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| CONTROL BLOCK: l l
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| 60 61 OOCKET NUMBER E.3 trJ EVENT DATE 74 75 HEPOf t T DATE 41 0 EVENT DESCRIPTION AND PRODADLE CONSEQUENCES h o 2 l During Reactor startup with the mode switch in startup_nnd hot standby.
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| the llPCI system did not become operational at 113'psig as specified in l
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| Technical Specifications 3.5-0.1.
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| The system was not operational l
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| .h O s l until 127 psig. There were no ef fects upon public health and safety due l
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| i l 0 l6 l l to this event. This is a repetitive occurrence as last reported on j
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| l0 lij l Reportable Occurrened Report No. 50-321/1979-106.
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| 40 el 42 43 44 47 CAUSE DESCniPTION ANDCORRECTIVE ACTIONS h gl This failure is due to a design deficiency and instrument drift. The l
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| 1111 l l Present design does not allow a trip'at 100 psig and reset at 113 paig.
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| l 3, ;
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| The pressure switches were recalibrated to specifications. Future cor-l i 3 l
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| rective action includes a design change to the pressure switchen and the l
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| ;3 l4 g l pursuit of a document change to the present Tech Specs.
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| :Ceorgia Pober. Company;
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| < Plant. E. " I., llatch ;
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| Baxley,1 Georgia.31513)
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| : Reportable -. Occurrence Report No. 321/1980-23.
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| DuringEreactor startup with' the mode switch in. startup' and hot standby position,
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| :the IIPCI System did nor -becomo operational: at 113 psig 'as specified in Technical
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| - (Specifications Section 3.5.D.'1.
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| There were no effects upon public health and
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| ~
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| r safety'duetto.this event. This is a repetit!1ve occurrence as last _ reported on Reportabic Oclcurrene,c - Report. No. 321/1979 106. This report addressed i
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| the problem of IIPCI Lisointing at 116' psig. Tachnical Specification Section 3.5-D.1 requires that 11PCI be operational:if.the reactor pressure is greater thanill3Lpsig. Prior 'to LER.50-321/1979-106, the switches, IE41-N001A-D, setpoint was:125 poig. '-This setpoint complied with Tech Specs requirement Table 3.2.2 which requires the switches to be set equal to or greater than 1000psigi sbut ;does not comply ~ with Tech Specs Section. 3.5-D.1 which required.
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| _'llPCI tolhe. operational rt 113 psig. The inherent: prob 1cm was first recognized at.'this point. A' design change-was submitted to change the netpoint to a'value 6
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| greaterithan'100 psig but Icos than 113 psig.
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| e j.q
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| .On February 24,1980' 11PCI'did not become operational at reactor pressure c qual to 'or; greater. than ' 113 psig. The calibration of the llPCI Steam Line
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| ({,,,
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| c Low Pressure Switches was checked and found as follows:-
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| N001A. trip 90.7' psi, reset 127.7 psi.
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| ~ N001B trip 98.7 psi,. reset.123.7 pai.
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| ;N001C trip 100.7 psi, reset.13'2.7 psi.
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| :N001D.LYip 98.7 pai, reset 123.7 psi.
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| 1Three of the-switches A,' B and D were found below the acceptance criteria
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| ~
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| K
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| ~ of' actuation ~at - greater thmi 100 psig.: The exoccted actuation point is
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| 'The dif ference' between the ' expected actuation and the L'
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| :- 10. 5 - c5. psi.
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| 6 Jactual trip point is attributed to instrument setpoint drift.
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| i 1The manufacturer of these switches is Darksdale.. The' specifications of-the
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| ('
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| switch permit-a react span different'.alc of 11 to 40 psig and.is not adjustabic.
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| Decause of the wide differential, the switches cannot be adjusted to meet the Spresent Tech Spec requirements.-
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| ;The planned eorrective;" action willIinclude t!io following.: A design: change to T
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| A','
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| ;the pressure switches to meet the Technical Specification requirements.is being e
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| g Jinvestigatedh. Unit.II Tdchnical, Specifi' cations (Standard Tech Specs)- require 3
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| ~
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| s ithat -11PCI be' operational at pressures cqual'to or greater than 150 psig.' AJ fe$;
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| < proposal"to' change Unit [I Tech ' Specs concerning 11PCI:to Standard Tech Specs 'is sq.
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| *Theing7 investigated. : A follow-up. report will be submitted.z
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