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| {{Adams
| | #REDIRECT [[05000368/LER-1980-060-03, Core Protection Calculator Channel Failed,Causing Trip Sequence.Cause Under Investigation.Watch Dog Timer Timed Out,Rendering Channel Inoperable.Sys Reinitialized & Bypasses Removed]] |
| | number = ML19345D426
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| | issue date = 12/09/1980
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| | title = Core Protection Calculator D Failed & on 801120 Calculator C Failed.Cause Undertermined.Watchdog Timer Timed Out Preventing Communications.Sys Reinitialized & Bypasses Removed
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| | author name = Shively C
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| | author affiliation = ARKANSAS POWER & LIGHT CO.
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
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| | docket = 05000368
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| | license number =
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| | contact person =
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| | document report number = LER-80-060-03X, LER-80-60-3X, NUDOCS 8012150090
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| | package number = ML19345D425
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
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| | page count = 1
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| }}
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| {{LER
| |
| | Title = Core Protection Calculator D Failed & on 801120 Calculator C Failed.Cause Undertermined.Watchdog Timer Timed Out Preventing Communications.Sys Reinitialized & Bypasses Removed
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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 = 05000368
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| | LER year = 1980
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| | LER number = 60
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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:-
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| ~
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| UPDATE REPORT - PREVIOUS REPORTS DATED 2/5/80 AND 8/28/80 F
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| NRC FORM 366 U.S. NUCLE AR REGUtATORY COMMISSION (7 77)
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| 80 EVENT DEscalPTION AND PAQtl ABLE CONSEQUENCES soi2i i During Mode 1 operation, the "
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| Core Protection Calculator (CPC) failed i ioi3i t on 7/30/80 and the "C" CPC failed on ' 11/20/80.
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| The ONBR/LPD trips were i I by-passed on the affected CPC channel, placing the reactor trip logic in 1 o.
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| In is t I a two out of three trio secuence.
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| The unaffected channels remained oper-1 i able.
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| Similar LER's for CPC "C" are: 50-368/80-002, 79-098, 79-096; for i o6 mT) I the "D" CPC is 50-368/80-008; for the "A" CPC are 50-368/80-051, 79-045. I i o p. i i Reporatable per T.S. 6.9.1.9.b.
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| CAUSE DESCR.PTION AP.3 CORREC(IVE ACTIONS h liio n I Investiaation did not reveal the root cause of the CPC program halt. Thei ii ii i
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| " watchdog" timer timed out preventing console communications, rendering i
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| The CPC system was re-initialized, by-i g i passes removed, and the unit returned to operable status.
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| Chris N. Shively 501/968-2519 NAME oF PPEPAREP 8012150090
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| }}
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| {{LER-Nav}}
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