ENS 41984

v t e ENS Event
21:09 Sep 12, 2005
Title	Overpower Of Reactor Due To Calibration Error On Steam Dump Control System
Event Description	On September 12, 2005 at 1709 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.502745e-4 months <br />, one feedwater train bypass valve (TV-1CN-100) unexpectedly opened at Beaver Valley Power Station Unit No. 1, causing the temperature of the feedwater going to the three steam generators to reduce. Reactor power then increased due to cooler feedwater temperature entering the steam generators. Reactor power increased to approximately 103 percent. The control room crew commenced reducing plant load and reactor power. Approximately 4 minutes later, TV-1CN-100 automatically closed as designed following an automatic opening signal. Reactor power decreased below 100% at approximately the same time. Currently, the plant is stable with reactor power at 93 percent. A calibration procedure of the Steam Dump Control System was ongoing at the time of the event. Preliminary investigation determined that this event occurred due to removal of an instrument card within the Steam Dump Control System which caused TV-1CN-100 to inappropriately open. Actuation of TV-1CN-100 was not initiated by a valid actuation signal. This event is being reported as a voluntary notification since the reactor power exceeded maximum licensed steady state power level of 102 percent. The licensee notified the NRC Resident Inspector.

ENS 41984 +/-
Where
Beaver Valley Pennsylvania (NRC Region 1)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+2.3 h0.0958 days <br />0.0137 weeks <br />0.00315 months <br />)
Opened:	Richard Bologna 23:27 Sep 12, 2005
NRC Officer:	John Mackinnon
Last Updated:	Sep 12, 2005
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v • d • e

v t e Emergency Notification System
Beaver Valley with Other Unspec Reqmnt
WEEKMONTHYEAR2005-09-12T21:09:00 [Table view]
[ENS list for Beaver Valley]

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