05000361/LER-1982-009

LER 82-009/01T-0:on 820325,Bechtel Informed Util of Location of Lumigraph Indicators Model 9270 Mfg W/Incorrect Resistors in Indicator Circuits.Caused by Improper Design of Indicator Circuits.Resistors to Be Replaced Prior to Full Power

ML20054B494
Person / Time
Site:	San Onofre
Issue date:	04/12/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20054B486	List: 05000361/LER-1982-009
References
LER-82-009-01T, LER-82-9-1T, NUDOCS 8204160558
Download: ML20054B494 (1)

LER-2082-009,

Event date:
Report date:
3612082009R00 - NRC Website

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3 t,0 til DCCKET *eUMUE R '4 6'3 t! VENT DA TE I4 25 HEPORT C ATE W EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h oi,j l December 10, 1981 Sigma Instruments Inc. informed Bechtel Dower Corp. by letter Uf a I a,,i l po tential ieficiency in their Lumigraph Indicators Model 9270. BPC informed SCE by l in,aj [ letter dated March 25, 1982 of where such instruments were installed in Unit 2. The I oisi i deficiency resulted when incorrectly specified resistors were improperly incorporated ;

omjl into the indicator circuits. Only circuit indication capabilities would be affected l

ol7j [ by this deficiency; no alarm or control functions are involved. [

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4 ,ioil The cause of this event was improper design of the indicator circuits by the vendor. l 1iis l l All San Onofre Unit 2 systems affected by this qeneric problem have been identified.1

,, i>;I Resistor replacements for San Onofre Unit 2 indicators will be made prior to full l iiiiji power operation. (1002 power level) l li t al l I s a rn iT i T *1PG M M O THF if L TA 1 U". 01 C ' DibCO /EHY GE SCR PTION i

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