ML19274E484

From kanterella
Jump to navigation Jump to search
LER 79-005/03L-0 on 790218:malfunction in Computer Resulted in Control Element Assembly Pulse Counting Position Being Inoperable.Cause Traced to Circuit Card in Computer Memory; No Fault Discerned.Card Contacts Cleaned
ML19274E484
Person / Time
Site: Millstone Dominion icon.png
Issue date: 03/16/1979
From:
NORTHEAST UTILITIES
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19274E483 List:
References
LER-79-005-03L, LER-79-5-3L, NUDOCS 7903260246
Download: ML19274E484 (1)


Text

NacPo ,$, u.s.nuct t . t. ... wi u.

(7 7F F LICENSEE EVENT REPORT coNTnot stock: [__{_j_{_j__[__J l 6 h (PEE A55 PHINT OH TYPE ALL REQUlHt'D INF ODr.'ATION)

EE] Ic IT IrLirj i si a l@l o I o I- I o lo Io 101- I o f oL ol@t h b, 41_111 t i l lj@L_LJ L LtN",0 IvrL Jif $1 CATLJ O

8 8 LIC t' N $ t '. COD E I4 'S LiC E N a t N u'.' M n CON' T o ' "" Z LU@l 015 l 0 I olo_L3 I 3 I 6J@lo s _

6>

1 2L1L81 719 j@t 0131116 74 i') RsPOHI DATL LLil]@

du

' 8 60 61 DOC n. E T w'.m L H tA E% E r.T D A T L EVENT DESCHIPTION AND PHO9 ACLE CONSEQUE NCES O'o

[a 2 [ During steady state power operation, the plant computer experienced a nalfunction g This resulted in CEA pulse counting position being g

[TiITl [ and was taken out of service.

[~oE l inoperable. In accordance with Technical Specification action statcaent 3.1.3.d, l HJ Loperation continued and the conputer failure was corrected. The conputer and the g g,,) l CEA pulse counting indication system was restored to operable status within 5-1/2  ;

Sinilar events LER's 77-41/3L, 9/26/77; 78-12/3L, 6/27/78; 78-21/3L, _ g o 7

[ hours.

g ( 9/26/78 and 78-27/3L, 10/24/78.

' CS'[' '!c0 sSCE4 COv.cs: .T Coot sSE$e sEElot 10191 11 IF 18 ll_l@ L7J@ l Il c.l s t 11 al u l@ l Y ]@ [y @ _

20 7 8 9 10 11 12_ 13 16 19 sf OUE N TI AL OCCUIiH E NCE RErOHT R E VISION g g ng EVENTDEAR Ar rOH T NO. CODE TYPE N O.

@ ,"(glg; [719 21I l-l Lo1015J.G l/l 10 31 LL_J l--I lo 1 J2_

_ 21 23 24 27 ;b 29 30 31 TA E A I I ON PLA T TE T J HOUns EL T F t UB. Peti Yr FACI HEH lll@LLl@ Lll@ 34 lz @

30 l0 lo o I o 31 40 ujj@

41 uu@

42

[ Aj@

43

[Il0[ll Q 4t 47 JJ 3's CAUSE DESCmPTION AND CORHECTIVE AC NONS h Ilowever, no fiiT_) [_Tip failure was traced to a circuit card in the conputer nenary. [

g

~ W I fault could be found in the circuit card. The card contacts were cleaned and the g,,,; l card was reinstalled. The conputer was restarted and normal operation restored.  ;

I 3 l With the conputer out of service, the linear heat rate surveillance was nonitored in  ;

- i 4 g accordance with Technical Specification 4.2.1.2 utilizing the excore detector systen. ;

go 7 8 9 st i  % POWER OTHER STATUS On O E DISCOVElIY DESCHtPTION

[TF1(Ej@ l018 5l@l flA l RJ@l Operator observation l ACTIVITY CO TENT AlL(ASEO OF RE L E ASE AN10UNT CF ACilVITY LOCATION OF RElf ALE li lo l 11] @ llj@l 7 8 'J 10 11 flA 4

1 l 45 flA go l

PLHSOSNf((xPOgunts NU'.4t E n TYPr DE '; C Fu P TION -

lilil 1 o 1010 l@lz l@l flA l Ptii$ONNEL INJU If 5 N U".Mt i n OESC H IP TiO4 7

i -

][0l0l0l@l 8 9 il 12 flA J g;)

LO'.5 0F OH DAV ACE TO F ACit t'IY TYPE DESCHIPf 604 '

riA I

_ FFR85L7J@l 7 9 10 60 Pygtl(tyy ^

""C "5' "'"

issen OuCoiP rmN U55 790320029'6 -

.1:folLttiSI 7 8 9 to flA 1 6B 69 ainu i i I i I J 80'5.