ML19207A510

LER 79-023/03L-0 on 790712:while Withdrawing Group 1 Control Element Assembly,Position Indication for Assembly 65 Stopped Indicating Outward Motion at 42 Inches.Caused by Electronic Failure of Printed Circuit Board.Board Replaced

ML19207A510
Person / Time
Site:	Calvert Cliffs
Issue date:	08/10/1979
From:	Lagiewski J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19207A508	List: ML19207A507 ML19207A510
References
LER-79-023-03L-01, LER-79-23-3L-1, NUDOCS 7908200333
Download: ML19207A510 (8)

Text

(7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l

,- 1 l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 9 l Ml O ClClN ll@l0101-l0101010101 10 Ol@l41111lilll@l LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO l

57 CAT 58 l@

CON'T 7

o 1 8

$$Rc l60L }@l6101 5 l 010 l0l3l1 DOCKET NUMBER 7l@l017l1l2l7 9l@l0l8l1l0l7 9l@

68 69 EVENT DATE 14 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h l o 12 I 1 At 4:30 o.m. whib withdrawino Grouo 1 CEA's durino cost refueling starton I o a i testing program, the primary position indication for CEA 65 stonced indicatino 1 o 4 l outward motion at 42". The secondary (or reedswitch) nosition indication i O s I continued to function nomally. Group 1 was fully withdrawn in accordance with I o e I Technical Specification 3.1.3.3.b.3.e.

DiiTl I I o 8 l  !

C DE CODE SUBCO E COMPONENT CODE SUSCODE SU E o 9 l II E l@ [E_j@ l A l@ l Il Nl Sl T Rl Ul@ l Xl@ W @

7 8 9 10 11 12 13 18 19 20

_ SE OU E NTI AL OCCUR R E NCE REPORT REVISION LE n EVENTYEAR REPORT NO. CODE TYPE NO.

@ ,ae g'RO RT 7 19 l l-l 10 12 l 3 l jf_j l 0131 Ll l-l l 01 21 22 23 24 26 27 28 29 30 31 32 KEN A ON ON LA T MET HOURS 22 S 8 IT FOR 8. SUPPLI MANUr C RER l3JA lglJ4Z lg [35 Z [g [36Z l@ l0 l0 0 lY l 37 40 lN [g 41 lN lg lN l@ lW 1l2l0l@3 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O l The plant computer did not output position indication for CEA 6_5 due to electronic l ii ii i i failure of a PC board 2EPl in y-canel location 00F12. Af';er reolacement oT the t

, , j failed board, the computer recognized CEA 65 selection anf updated position indicationi s i 3 l nomally. This failure is not a repetitive occurrence. l i 4 1 1 7 8 9 80 STA  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION Ii I5 I l B l@ l 0l 0l 0l@l NA l l Al@l Operator Observation l ACTIVITY CO TENT RELE ASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i s lZl@lZlgl NA l l NA l PERSONNEL E XPOS ES NUMRE R TYPE DE SCRIP TION i NA 7

l 0 ] 0 l 0 l@l Z l@l [

PERSosNE t ,Nau'R,,,

2 i3 80 NUVRER DESCRIPTION 7

i a 8 9 l0l0l0l@li2 11 NA 80 mi"' " "C ^&'N ' " " @ 7 9082 o o TW5 i ,

a 9 gg io NA 80 l

' p ,! - . . ..,

~., NRC USE ONLY

o ,ssEll@l'""'E'SCRiPTiON I NA @ l lllllllllllll:

7 8 9 to 68 69 80 ;

N AYE OF PREP ARE9 PHONE