ML19331E040

LER 80-031/01T-0:on 800804,voltage Transients Were Induced Into Turbine Generator Digital Electrical Hydraulic Sys Computer.Reactor Scrammed When MSIVs Closed.Caused by 345 Kv Distribution Sys Line Fault

ML19331E040
Person / Time
Site:	Cooper
Issue date:	08/18/1980
From:	Scheer J NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19331E038	List: ML19331E037 ML19331E040
References
LER-80-031-01T, LER-80-31-1T, NUDOCS 8009050255
Download: ML19331E040 (1)

Text

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? 8 61 QOCKET NUMBER 6d 69 EVENT DATE 74 75 D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h fo l 2 I puring steady state normal operation, a severe weather storm caused a line fault and i io13l lLt is believed subsequent voltage transients signals were induced into the turbine l 10141 kenerator digital electrical hydraulic (DEH) System computer. The reactor scra'mmed l 10161 hutomatically when the MSIV's closed. There were no significant occurrences as a re-I l o 16 I hitl e o f rhic scrnm nnr1 there were no ndverse affects en the ptib1!; han1th and safetyJ l o 171 1 1 10181 l l 7 w9 80 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SU8 CODE Fo I o 1 IC lD l@ [0j@ [Z j@ lZ lZ l Z l Z [ Z l Z l@ ]@ [ Zj @

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40 41 42 s-CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i ; O l pEH computer circuitry sensed false signals indicating TG output breaker opening. j i i (Ihis signal caused bypass valves to open. With the bypass valves open and the gover 1 i ,i,i Inor valves not controlling main steam pressure, a Group I isolation occurred due to ;

y llow pressure and reactor scrammed on MSIV closure. Further evt.luation of the elec- l li141ltrical circuitry is planned. I F a 9 80 STA S a;, POW E A OTHER ST ATUS DIS O RY DISCOVERY OESCRIPTION l 11 IS I [E,j@ l Ol 8l 6l@l NA l l**A I@l** Operator Observation l I

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I H 9 10 tia 69 80 E Jerry L. Scheer 402-825-3811 0 NAVE OF PREPARER PHONE: $

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