ENS 46431: Difference between revisions

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| event date = 11/22/2010 17:47 CST
| event date = 11/22/2010 17:47 CST
| last update date = 11/22/2010
| last update date = 11/22/2010
| title = Valves Identified Open In Mode 2 That Should Have Been Closed
| title = Valves Identified Open in Mode 2 That Should Have Been Closed
| event text = At 1547 CST, November 22, 2010, the reactor mode was changed from Mode 4 to Mode 2 with the main steam drain valves, which are primary containment isolation valves, tagged open with power removed from their respective breakers.  The valves were tagged to comply with S/D [Shutdown] operating procedure requirements.  The valves should have been restored prior to making the mode change.  The main steam line drain isolation valves MO-2373 and MO-2374 were restored at 1747 CST and verified at 1755 CST.  Startup was held for determination of further actions needed.  Reactor startup recommenced at 2200 CST.  Currently the reactor is not critical.
| event text = At 1547 CST, November 22, 2010, the reactor mode was changed from Mode 4 to Mode 2 with the main steam drain valves, which are primary containment isolation valves, tagged open with power removed from their respective breakers.  The valves were tagged to comply with S/D [Shutdown] operating procedure requirements.  The valves should have been restored prior to making the mode change.  The main steam line drain isolation valves MO-2373 and MO-2374 were restored at 1747 CST and verified at 1755 CST.  Startup was held for determination of further actions needed.  Reactor startup recommenced at 2200 CST.  Currently the reactor is not critical.
The licensee notified the NRC Resident Inspector.  The licensee notified the Minnesota State Duty Officer.
The licensee notified the NRC Resident Inspector.  The licensee notified the Minnesota State Duty Officer.

Latest revision as of 21:08, 1 March 2018

ENS 46431 +/-
Where
Monticello Xcel Energy icon.png
Minnesota (NRC Region 3)
Reporting
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-0.25 h-0.0104 days <br />-0.00149 weeks <br />-3.4245e-4 months <br />)
Opened: David Barnett
23:32 Nov 22, 2010
NRC Officer: Donald Norwood
Last Updated: Nov 22, 2010
46431 - NRC Website
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