05000316/LER-1978-093-03, /03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift

/03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift

ML17317A826
Person / Time
Site:	Cook
Issue date:	12/20/1978
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:
Shared Package
ML17317A823	List: 05000316/LER-1978-091, Forwards LER 78-091/03L-0; 78-092/03L-0/; 78-093/03L-0; 78-094/03L-0; 78-095/03L-0; 78-096/03L-0; 78-097/03L-0; & 78-098/03L-0 05000316/LER-1978-091-03, /03L-0 on 781125:source Range Neutron Flux Channel N-31 Inoperable.Caused by Unclean Connectors on High Voltage Cable & Signal Cable at Prcamp 05000316/LER-1978-092-03, /03L-0 on 781125:reactor Coolant Average Temp on 2 of 4 Loops Below Tech Specs of 541F,resulting in P-12 Permissive Being Actuated.Caused by Turbine Test W/Minimum Steam Dump,Increase Steam Flow Caused Temp Drop 05000316/LER-1978-093-03, /03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift 05000316/LER-1978-094-03, /03L-0 on 781202:halon Sys for Cable Spreading Area Was Discharged & Therefore Inoperable.Caused by Operator Error 05000316/LER-1978-095-03, /03L-0 on 781206:while Decreasing Turbine Load, Reactor Coolant Average Temp Exceeded 576.2 F.Caused by Faulty Drain Valves on 5-A Heater,Creating Unstable Feedwater Control & Turbine Load 05000316/LER-1978-096-03, /03L-0 on 781209:during Rapid Load Reduction from 100% to 88%,axial Flux Difference Went Outside Target Band. Air Leak on a Condenser Vacuum Breaker Caused Increase in Back Pressure on Main Condenser 05000316/LER-1978-097-03, /03L-0 on 781209:during Rapid Pwr Reduction from 100% to 88%,pwr Pressurizer Pressure Reduced Below Tech Spec Limit of 2220psia.Caused by Rapid Pwr Reduction Because of Decreasing Vacuum on Main Turbine/Generator 05000316/LER-1978-098-03, /03L-0 on 781010:axial Flux Difference(Afd) Monitoring Alarm Point Was Discovered to Be Set at 103% Vice 84%.Caused by Afd Alarm Trip Point Being Raised for Testing Purposes & Not Returned to Correct Point
References
LER-78-093-03L, LER-78-93-3L, NUDOCS 7812270264
Download: ML17317A826 (2)

LER-1978-093, /03L-0 on 781125:rod Position Indication(Rpi)For Control Rod H-8 Exceeded 12 Step Limit.Caused by H-8 Drift

Event date:
Report date:
3161978093R03 - NRC Website

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