|
|
| Line 1: |
Line 1: |
| {{Adams
| | #REDIRECT [[05000368/LER-1980-060-03, /03L-0:on 800730,D Core Protection Calculator Failed During Mode 1 Operation.Cause Unknown.Dnbr/Lpd Trips Bypassed;D Sys Reinitialized & Failure Indications Returned to Normal.Bypasses Removed.Unit Remained Operable]] |
| | number = ML19340F114
| |
| | issue date = 01/13/1981
| |
| | title = Core Protection Calculator Channel Failed,Causing Trip Sequence.Cause Under Investigation.Watch Dog Timer Timed Out,Rendering Channel Inoperable.Sys Reinitialized & Bypasses Removed
| |
| | author name = Shively C
| |
| | author affiliation = ARKANSAS POWER & LIGHT CO.
| |
| | addressee name =
| |
| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
| |
| | docket = 05000368
| |
| | license number =
| |
| | contact person =
| |
| | document report number = LER-80-060-03X, LER-80-60-3X, NUDOCS 8101190451
| |
| | package number = ML19340F113
| |
| | document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| |
| | page count = 2
| |
| }}
| |
| {{LER
| |
| | Title = Core Protection Calculator Channel Failed,Causing Trip Sequence.Cause Under Investigation.Watch Dog Timer Timed Out,Rendering Channel Inoperable.Sys Reinitialized & Bypasses Removed
| |
| | Plant =
| |
| | Reporting criterion =
| |
| | Power level =
| |
| | Mode =
| |
| | Docket = 05000368
| |
| | LER year = 1980
| |
| | LER number = 60
| |
| | LER revision = 3
| |
| | Event date =
| |
| | Report date =
| |
| | ENS =
| |
| | abstract =
| |
| }}
| |
| | |
| =text=
| |
| {{#Wiki_filter:.-
| |
| UPDATE REPORT - PREVIOUS REPORT DATE 1-7-81 U. S. NUCLE AR REGUL ATORY COMMistaOss NRC F ORM 364 (7 771 LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCet l l l l l l lh IPLE ASE PRINT OR TYPE ALL REOutRED INFORMATIONI lTTT1 1 AlR l Al Nj o ! 2lgl 0 l0 l - 10 l 0 l 0l 0l 0 l-l 0 l0 jg4 l1]1;ll1lgl l jg
| |
| . 9 LiCthsti coot 18 in LacsNst Nvwsta 26 26 L K t ent,v,6 W
| |
| 6, C., se CON *T 0 71310l8iOi@l0i1l113i8l11@
| |
| Lo LU.
| |
| J.3 L.LJ@l015 p 10 i 0is l 6 i8 igi 1 oocor wo..
| |
| . n iuoi o.r.
| |
| 1.
| |
| 1
| |
| ..o, o.ii EVENT OESCR.PTION AND PRCS ABLE CONSE0VENCES h i Durino Mode 1 operation, as indicated on the attached 100. the Core' I
| |
| to62i i Protection Calculator (CPCI channels failed. causing a channel DNBR/l_PL J oi Uud) I trip. The trip signals were bypassed on the affected CPC channel, placing lo isi i the Reactor triD looic in a two out of three trio secuence.
| |
| The unaffectt i e is i 1 ed channels remained operable. Similar occurrences are.. indicated on the i loi>llattached loc.
| |
| Pecortable Der T.S. 6.9.1.9.b.
| |
| I I
| |
| Io !v J 1 C f Lect
| |
| $.C
| |
| ("fA,0NE~r L0ut su
| |
| },
| |
| og II I Al@ LEJ@ LEj@ l I l NI S l TIR l Ul@ L j@ LZ_j @
| |
| Y toi.i
| |
| @,a=..o In~,.[..
| |
| !.' ?"c't,',''[
| |
| 9d" 1%'
| |
| "' O'"'
| |
| a I 810 I l--J l 016l 0 I W
| |
| Lo O, L xj t,,-J L3J 2,
| |
| n u
| |
| 2 a
| |
| 2, n
| |
| u u
| |
| ..c3"lf''E'"h, g W#O '.YW"4 c'~,'*L
| |
| 'Mi*o'
| |
| :- oi.. nn ',".'S'"!;'
| |
| ,2 3
| |
| 'To",WJ' lC[4 l j
| |
| LEJ@lf.J@ L ZJ g tz. J @
| |
| 10 10 lo I'd I W@
| |
| L.,NJ g L.,Nj @
| |
| n 2.
| |
| v
| |
| .a CAUSE CESCR PTION AND CCRRECitVE ACTIONS h liio i llnvestication has not revealed the root cause of the CPC program halts.
| |
| i m I" Watch doo" timer timed out preventing console cormiunications, rendering i m ithe CPC channel technically inocerable. The CPC system was reinitialized;i 1 bypasses removed, and the unit returned to operable status. A failure i
| |
| i,13i iii. i iinvestigation is in progress.
| |
| i
| |
| ~
| |
| '5W7s' or-i.,rus @ U'ci??A' o.scou., o.m.,,,,o, @
| |
| uo i.
| |
| l 1i is 1 LEJ@ 11 I 01018I Mode i I LAJ@l NA I
| |
| n
| |
| * !rm,, c '#
| |
| . ovu o, e,-.y @ l t oc.,,o
| |
| ,,,, a.3, @
| |
| ] | |
| . u.s o o,o,sw
| |
| .e u.s.
| |
| l NA l
| |
| li !o I LZJ @ LZJ@el, NA
| |
| =
| |
| ,,u. s o.,.~',*t...o...
| |
| oix...r. @
| |
| o.
| |
| r ITTTI lo I of Ol@LZ.J@l NA l
| |
| a
| |
| ..so~,.'t,~w'le:
| |
| ecsc...rsos@
| |
| ~uo.t.
| |
| li la ! 101010 l@l NA l
| |
| a ho, on,oj',g'j,o,.cr.n, g LLj@l NA l
| |
| i o
| |
| ~
| |
| u.Lu Lsu,'I@i[.','c..,1,o~@
| |
| ~ac use oNov 1
| |
| l NA 1 lll1lltl;;;;l 5dl/968-2519 Chris N. Shively
| |
| ,,, g NAME OF PREPARE, Ronan//SL
| |
| | |
| s LER 50-368/80-060 Rev. 3 CORE PROTECTION CALCULATOR FAIL LOG
| |
| ("WATCHD0G" TIMER TIMED OUT)
| |
| DATE CHANNEL Rx PWR.
| |
| LER 6/13/79 A
| |
| 10-4%
| |
| 368/79-045 12/11/79 C
| |
| 50%
| |
| 368/79-096 12/05/79 C
| |
| 30%
| |
| 368/79-098 1/10/80 C
| |
| 50%
| |
| 368/80-002 1/17/80 B
| |
| 50%
| |
| 368/80-004 1/23/80 B
| |
| 100%
| |
| 368/80-006 1/28/80 B
| |
| 100%
| |
| 368/80-008 7/17/80 A
| |
| 100%
| |
| 368/80-051 7/30/80 D
| |
| 100%
| |
| 368/80-060 11/20/80 C
| |
| 65%
| |
| 368/80-060 Rev. I 12/02/80 D
| |
| 40%
| |
| 368/80-060 Rev. 2 12/19/80 C
| |
| 87%
| |
| 368/80-060 Rev. 3 12/21/80 C
| |
| 1%
| |
| 368/80-060 Rev. 3
| |
| }}
| |
| | |
| {{LER-Nav}}
| |