ENS 42854

v t e ENS Event
22:15 Sep 21, 2006
Title	Oscillation Power Range Monitors (Oprms) Inoperable
Event Description	On September 14, 2006, the Plant Staff was notified by General Electric (GE) via a draft Safety Communication SC06-010 of a potential non-conservative setting of the OPRM Enabled Region Drive Flow Setpoint when the plant is in Single Reactor Recirculation Loop Operations. On September 21, 2006, at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br />, based on available information, it was conservatively determined that all four OPRM channels were inoperable due to their current flow setpoint settings and uncertainties associated with OPRM enabling. The OPRM instrumentation provides inputs to the Reactor Protection System. The OPRM instrumentation is relied upon for providing a safe shutdown safety function when operating during an unstable power to flow condition. Operations personnel entered Technical Specification LCO 3.3.1.3 Action B.1 to initiate an alternate method to detect and suppress thermal hydraulic instability oscillations. This event is being reported as a condition that could have prevented the safety function of structures or systems required to shut down the reactor and maintain it in a safe shutdown condition. These actions and this report are based on preliminary information. Updates will be provided as necessary as additional information becomes available. The licensee notified the NRC Resident Inspector.

ENS 42854 +/-
Where
Perry Ohio (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor
Time - Person (Reporting Time:+-2.03 h-0.0846 days <br />-0.0121 weeks <br />-0.00278 months <br />)
Opened:	David O'Donnell 20:13 Sep 21, 2006
NRC Officer:	Jason Kozal
Last Updated:	Sep 21, 2006
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v • d • e

v t e Emergency Notification System
Perry with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor
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