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

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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

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[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  !

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