ML19254E296

LER 79-075/03X-1:on 790822,during Mode 1 Operation,Data Link from Control Element Assembly Cluster to B Core Protection Computer Dropped,Resulting in B Channel Tripping.Caused by Failed Optical Amplifier.Data Link Was Repaired

ML19254E296
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/25/1979
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19254E288	List: ML19254E287 ML19254E296 ML19254E299 ML19254E301 ML19254E305
References
LER-79-075-03X, LER-79-75-3X, NUDOCS 7910310424
Download: ML19254E296 (1)

Text

.

Update Report - Previous Report Date September 12, 1979

. N Rc , oRM x.

(7 77) U S Nt101 f AR RE GUL AT0ftY COMM Si.lON LICENSEE EVENT REPORT EXHtBlT A CONTROL BLOCC l l l l

> l clh (PLE ASE PRINT OR TYPE ALL HEQUIRED INF ORMATIONI lo lil [A I p lA I n I 012 l@l 0101 -J D i 0

? e 's LICEN5E E CODE 1. 16 0 l 010 l- 1010 :1i@l4 l 11 LetEN5L N s*.'tiL H ;b 11111 l@l67 L AIr des t eC E NSE tveE Ju l@

CON'T o ' -

, 8 C

.0 LL)@l015101010 l 31618 )@l0 60 ti DOCet E T NUMSER M 69

[ 8 212 l7 1 9)@l1[0:2l5l7l9j@

E VENT D ATE 'd 'n REPOMT O AT E At EVENT DESCR6PT80N ANO PROBABLE CONSECUENCES IO l211 During Mode 1 operation, the a link from CEAC #1 to the "B" CPC i

10131 1 drnonad a bit causina an inaccurate output indication, resulting in the lo1 1I "B" CPC channel trippina. The data link failed in the conservative i fBTn i direction and the remaining CEAC data links were operable. ,

O s t There have been no similar occurrences.

I e

' I Ronnrtahlp nor T 9. 6 Q.1 9b.

l O & (

av l

$ $ $ T E 4' CAU E sn C A USE COCE COCE Ss0JCCL tt.*a- s vat 5g C

1o14 SvMCOCE

, , l ll A l@ [E j@ [ E j @ lI l dr vn.Nti.*cc..ElS l lT;R lU @ we.ws(W@ LZj @

.. - m SEO ENTsAt U C '. u as *. i , t s i; pig ft;

@ M "a! -l[!$i v a l-J n

15 I[I 51 24 a

[gj 2,

[ bY31 5

l-1 I'E V :4QN L,$J n .

T aEN A T GN ON' T ME Od C R5 2 Su TT r r $ pp i va [a 'T n LAJ@LZJ@ LLl@ LZ_.lO 101010 lu40 I LNj@

.J 34 3$ 30 '

th L.N g;

J@ LNJ@

43 l Sl 5l2lEnSjg ga gf cAusE oEscRiPTiON ANo coRRec nve AcTiOss @

> a l The data link outout error was caused by a failed ootical amplifier. Thet data link was repaired and the "B" CPC returned to service within one

, , , hour meeting the requirements of Action Statement T.S. Table 3.3-1,

, ,  ; Action 2a.

I i . I T

a 2 I STA 5  % ,OsvE R nn C T ME R ST A TUS d SCO H

> a WF H y DE 5cu pf aON Ii' Is' JT,v, I LILJ@ T v C O' rf.a l 011 "l Ol@Pwr " Escalation "

l LA_J@l n/a l Tes "

a AvouNT or AcTiviiv

' e. tOcAriOsc,pEtE45r@

' " EtIAsto or aILEastL_J @ LJ@l i n/a [ n/a i

,, 450N.!Et E ,,J E 5 " *)

Nm .E T,.E "

li' l > l 101010 l@LZj@lOm.ON n/a @

, ..soNd',Nm'I , E l

N u...i n eE SC... n,N @ a

> l>

i 11 9 lolOl0J@l 11 11 na/

I Loh f;F O'* uaVACE TO FACIL 87 v gg O L SC p l

• son FTD 7i't Lj@L n/a ,u e (J E 5 . R ', TION ,,

N"C LY I2101 dsvE$l n/a

'o i [iiittisiisil u ,, n NAME OF PREPAREH PpX EPnderGraft

,,,-@. E 7910310 Q 1,'4 i~ 198