ENS 48778: Difference between revisions
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| event date = 02/24/2013 12:05 EST | | event date = 02/24/2013 12:05 EST | ||
| last update date = 02/24/2013 | | last update date = 02/24/2013 | ||
| title = Manual Reactor Trip Due | | title = Manual Reactor Trip Due to Loss of Condenser Vacuum Indication | ||
| event text = On February 24, 2013 at 1205 [EST] with reactor power at 25% and the turbine offline, a manual reactor trip for Sequoyah Unit 2 was initiated due to loss of condenser vacuum indication causing closure of condenser steam dumps, opening of the Steam Generator Atmospheric Relief Valves, and lowering hotwell level resulting in imminent loss of hotwell pumps. The cause of the event was determined to be a faulty test connection on B Condenser vacuum pressure switch. | | event text = On February 24, 2013 at 1205 [EST] with reactor power at 25% and the turbine offline, a manual reactor trip for Sequoyah Unit 2 was initiated due to loss of condenser vacuum indication causing closure of condenser steam dumps, opening of the Steam Generator Atmospheric Relief Valves, and lowering hotwell level resulting in imminent loss of hotwell pumps. The cause of the event was determined to be a faulty test connection on B Condenser vacuum pressure switch. | ||
During the event, steam pressure rose to the setpoint for the first Steam Generator code safety valve (1064 psig). [The safety valve opened, then reseated]. | During the event, steam pressure rose to the setpoint for the first Steam Generator code safety valve (1064 psig). [The safety valve opened, then reseated]. |
Latest revision as of 22:01, 1 March 2018
Where | |
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Sequoyah Tennessee (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+-1.75 h-0.0729 days <br />-0.0104 weeks <br />-0.0024 months <br />) | |
Opened: | Matthew Leenerts 15:20 Feb 24, 2013 |
NRC Officer: | Vince Klco |
Last Updated: | Feb 24, 2013 |
48778 - NRC Website
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