05000368/LER-1980-051-03, /03L-0:on 800717,during Mode 1 Operation,Core a Protection Calculator Failure Alarm Was Received.Cause Not Determined.Calculator Reinitiated & All Failure Indications Returned to Normal.Bypasses Removed

/03L-0:on 800717,during Mode 1 Operation,Core a Protection Calculator Failure Alarm Was Received.Cause Not Determined.Calculator Reinitiated & All Failure Indications Returned to Normal.Bypasses Removed

ML19344B154
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/15/1980
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19344B148	List: 05000368/LER-1980-051-03, /03L-0:on 800717,during Mode 1 Operation,Core a Protection Calculator Failure Alarm Was Received.Cause Not Determined.Calculator Reinitiated & All Failure Indications Returned to Normal.Bypasses Removed 05000368/LER-1980-052-03, /03L-0:on 800719,during Mode 1 Operation, Containment Bldg Pressure Indicator 2PI-5603-3 Failed High. Caused by Erratic Current Repeater 2PY-5603-3B.Repeater Replaced & Pressure Indication Returned to Normal ML19344B147
References
LER-80-051-03L, LER-80-51-3L, NUDOCS 8008250653
Download: ML19344B154 (1)

LER-1980-051, /03L-0:on 800717,during Mode 1 Operation,Core a Protection Calculator Failure Alarm Was Received.Cause Not Determined.Calculator Reinitiated & All Failure Indications Returned to Normal.Bypasses Removed

Event date:
Report date:
3681980051R03 - NRC Website

text

..

NRC ORM 366 U. S. NUCLE AR REGUL ATORY COMMtsSION (1 771 LICENSEE EVENT REPORT EXHlBIT A CONTRot eLoCie l l l l l l l@

(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI i

i AlR l Al Nl012lgl O jo l -l0 l0 l 0l 0l 0l-l 0 j0 lg l1 l 1l1 l 1lgl l ]g o i 7

e L.CENSEE CODg is 15 L, CENSE ~uwetu 25 26 Lact ~st av,6 Ju ba c AT te CON'T l' "c' lLJIO 15 p 101013 I rs I n l@l n l7 l i ! 7t n I nl@l o l Al 11 sl a i nl@

o i i

8 60 6

DoCnET ~uMSEn 68 WJ EvtNT oATE 74 7b HE,oHToaTE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES to FTrri i During Mode One Operation, "A' Core Protection Calculator (CPC) failure i o 2 i alarm was received.

The DNBR/LPD trios were bvoassed on "A" CPC clacingI [U3] I the Reactor trip logic in a 2 out of 3 trip seauence.

CPC channels "B".I "C", and "D" remained operable.

Similar to LER's 50-368/79-045,and I

pis,i o s 1 79-074.

Reportable per Tech Spec. 6.9.1.9b.

I l o l i _I I I

o a l I

'cS's"

cTe' scEn su%E BEE >'oe t

cou,o~e T cout 111A,J,,O I,f,J@ LEJ @ I I N I S I T IR I U l@ I,l, J@ LIJ @

o.

u o

2 L

EvtNTytan et si o

~

@,a=E R'Nol 9 In I L--J In I sit i Id in I,,

lijk l-J 10j

_ 26 22 23 24 26 27 28 2'l 10 31 3J 1AKEN A

,L T

M T HOURS 22 5e T

, oa M

$u,,L MAN

.A TURfA (E_J@l2_J@

LZJ@

1 3.J O I D I O 10 l u I L!JJ@

IJNj@ [Nj@ IC l4 l 910 l@

33 34 3b 36 33 40 et og 43 44 sy CAUSE OESCR.PTION AND CORRECflVE ACTIONS h gi Exact cause of CPC "A" failure could not be dete mined.

The CPC was re i mI initialized and all failure indications returned to normal.

The CPC "A"I li i 21 1 bvnascoe warp rpmnved and the channpl roturned tn carvico.

I i 3 I

I LLLtJ l I

'5'A'W oT ia sT Tus @ "'sc27 v' oscuvioroisc,,,,os@

vo ia li Is l LEJ@ 11 l O f Ol@l Power Oos I

LAJ@l NA I

".invi,,

cati =1 a

..ou~T o,,ctim @ l toca,,o,o,,,u.s,@

.,u.s.o o,.ru s.

li ic 11ZJ @ LZJ@l NA l

NA l

,..so~ a..osa is

=

o. sm. 1,o, @

,,u....

T.,.

LLLJ Lo 10I Ol@LZJ@l NA l

a

,.sc~~,'t,~3u'le s oisca. sio @

~uo.ca li la i 101010 l@l NA l

7 8 9 11 12 f,0 Y

,(

oESCR,T oN E E0 LzJ@l NA l

I 2 bj l.su,'s@if.','c.,,1,0~ @

~

Nac Usc omv

, NJ l NA 1 lllllllll1ltl NWE OF PAEPARER PHON E:

s on-m