ML19256F324

LER 79-100/03L-0:on 791120,during Normal Reactor Startup, Full Out Indication Not Received by Reactor Sequence Control Sys from Control Rod 06-27.Caused by Defective Optical Isolator.Isolator Replaced

ML19256F324
Person / Time
Site:	Brunswick
Issue date:	12/13/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256F322	List: ML19256F321 ML19256F324
References
LER-79-100-03L, LER-79-100-3L, NUDOCS 7912180498
Download: ML19256F324 (1)

Text

NRC F0RM ' > w , . . . . . m. . . . w o o n . w . . . . ..... .....

(7 77)

,

-

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l 18 l3 l N lLICENSE 7

C l BE CODE l E lP 14l 2 l@l 15 0 l 0 l -l 0LICENSE l 0 l NUMtlEH 0 l 0 l 0 l - l 010 25 l@l 26 4 lLICENSE 1l 1 lTYPE 1l 1l@l JO l

$ 7 CA T 58 l@

CON'T o

" "'

7 1

8 3[ncs60l L @lEl 0 l 5 lDOCKET 0 l- NUMBER l 013 l 2 l 684 @l 69 1 l1 12 l0 l 7 l 9 l@l 1l2 EVENT DATE 74 75 l1 l3 l7 l9 l@

REPORT D AT E t10 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l During a normal reactor startup, " Full Out" indication was not being received by ]

o 3 I RSCS from control rod 06-27. The rod was bypassed " Full Out" when all other l o 4 l indications showed the rod at notch 48. I o s l I o e l I o 7 l o a 1 Technical Specifications 3.1.3.7, 6.9.1.9b I 7 8 9 83 CE CC E SLBCC E COMPONENT CODE S BC DE S E o 9 l R l B l h [,E_jh W h lI lN lS lT lR lU lh l Xlh W h 19 2G 7 8 9 to 11 12 13 18

_. SEQUENTI AL OCCURRENCE REPCRT REVISION go go EVENT YE AR REPORT NO. CCDE TYPE No.

hy(y,y R 25 7l 9l 22 l-l 23 Lll 0l 0l 24 26 l/l 27 l0l3l 28 29 ltl 30 l-l 31

[qj 32 T K ACT ON CN PLA T T HOURS S8 IT FOR B. SUPP LI E MANUFACTURER dhlZ_jh l35 Z l@ l_Z_j h 33 34 36 l 0lOl0l0l 37 40 d@ W@ lNlh 41 42 43 lGl0l8 O lh 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The problem was found to be a defective optical isolator which was replaced from l li li l stock. The unit was tested to ensure proper signal transfer and returned to 1 l i i 21 i service. This is considered an isolated event, and no further actiot is required. I i 3 l 1

-

11 141 i  !

7 8 9 80 ST S ** POWE R OTHER STATUS OSO RY DISCOVERY CESCRIPTION i 5 Lj@ l0l0 1l@l N/A l lAl@l Operator Surveillanc l ACTIVITY CO TENT RELEASED CF RELE ASE AMOUNT OF ACTIVITY '

LOCATION CF RELE ASE i c N/A N/A 7 4 9 W @ l 10Z l@l ft 44 l l 45 80 l

PERSONNEL EXPOSLRES NUU8ER i 7 l 0 10 l 0 {hl ZlTYPE @lDESCRIPTICN NA l

' ' ' ' *

,ERSONNEL,N;UIES

-

NuveER DESCRiPTiONh i a l0l0l0l@[ , N/A . l CSS OF CR D AuE To FACILITY Q43 TYPE D E SC RIP TION  %./

Q W@l 7 8 9 10 N/A

, 30

'

ISSUg OESCRtPTION @ 7 9g180 % N3C USE ONLY l1Lo_j 7 8 9 h IO N/A l 68 69 lllllll1IIIll2 60 %

NAME OF PREPAREP

. . oWSon, h. PHON E: