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

/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

ML17317A828
Person / Time
Site:	Cook
Issue date:	12/20/1978
From:	Murphy C 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-78-095-03L, LER-78-95-3L, NUDOCS 7812270272
Download: ML17317A828 (2)

LER-1978-095, /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

Event date:
Report date:
3161978095R03 - NRC Website

text

NRC FORM 366

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U. S. NUCLEAR REGULATORY COMMISSION

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0,.1 78 Qs 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOUENCES Q10 D

1 AT 1.00 POWER.

DEVELOPED TROUBLE WITH 5-A HIGH PRESSURE

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HEATER LEVEL CONTROL.

THE FEEDWATER CONTROL TO THE STEAM GENERATORS BECAME

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UNSTABLE.

PERFORMED AN EMERGENCY LOAD" REDUCTION OF 105 POWER.

WHILE DECREASING

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TURBINE LOAD THE REACTOR COOLANT AVERAGE TEMPERATURE EXCEEDED 576.2 DEGREES FOR

~OB 20 MINUTES IN VIOLATION OF TECHNICAL SPECIFICATION 3.2.5a.

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CAUSE

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THE CAUSE OF THIS EVENT WAS.>FAULTY DRAIN VALVES ON 5-A HEATER, CREATING UNSTABLE FEEDWATER CONTROL AND TURBINE LOAD.

TURBINE LOAD WAS LOWERED RAPIDLY CAUSING THE TEMPERATURE TRANSIENT OF THE REACTOR COOL'ANT.

THE TRANSIENT WAS NOTED AND DEALT 3

WITH BY THE REACTOR OPERATOR.

BRINGING IT BACK INTO NORMAL RANGE WITHIN THE TIME 4

LIMIT OF THE ACTION STATEMENT.

THE DRAIN VALVES HAVE BEEN REPAIRED.

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY UZ Qss 2

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10 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q3B

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