ENS 48477: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by Mark Hawes)
 
(Created page by program invented by StriderTol)
 
Line 16: Line 16:
| event date = 11/03/2012 08:23 EDT
| event date = 11/03/2012 08:23 EDT
| last update date = 11/03/2012
| last update date = 11/03/2012
| title = Automatic Scram On Low Reactor Water Level
| title = Automatic Scram on Low Reactor Water Level
| event text = On November 3, 2012 at 0823 EDT, Nine Mile Point Unit 1 experienced an automatic reactor scram on low reactor water level. All control rods fully inserted and all plant systems responded per design following the scram. Prior to the automatic scram, an unexpected high Reactor Pressure Vessel (RPV) water level was experienced, followed by a turbine trip and subsequent lowering of RPV water level to the RPV low level scram set point. The cause of the water level transient is unknown.  
| event text = On November 3, 2012 at 0823 EDT, Nine Mile Point Unit 1 experienced an automatic reactor scram on low reactor water level. All control rods fully inserted and all plant systems responded per design following the scram. Prior to the automatic scram, an unexpected high Reactor Pressure Vessel (RPV) water level was experienced, followed by a turbine trip and subsequent lowering of RPV water level to the RPV low level scram set point. The cause of the water level transient is unknown.  
Following the automatic scram, the High Pressure Coolant Injection (HPCI) System automatically initiated as expected. HPCI is a flow control mode of the normal feedwater systems, and is not an Emergency Core Cooling System. At 0824 EDT, RPV level was restored above the HPCI System low level actuation set point and the HPCI System initiation signal was reset. Pressure control was established on the Turbine Bypass Valves, the preferred system. No Electromatic Relief Valves actuated due to this scram.  
Following the automatic scram, the High Pressure Coolant Injection (HPCI) System automatically initiated as expected. HPCI is a flow control mode of the normal feedwater systems, and is not an Emergency Core Cooling System. At 0824 EDT, RPV level was restored above the HPCI System low level actuation set point and the HPCI System initiation signal was reset. Pressure control was established on the Turbine Bypass Valves, the preferred system. No Electromatic Relief Valves actuated due to this scram.  

Latest revision as of 22:02, 1 March 2018

ENS 48477 +/-
Where
Nine Mile Point Constellation icon.png
New York (NRC Region 1)
Reporting
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER: 05000220/LER-2012-005
Time - Person (Reporting Time:+-0.55 h-0.0229 days <br />-0.00327 weeks <br />-7.5339e-4 months <br />)
Opened: Matthew Busch
11:50 Nov 3, 2012
NRC Officer: John Knoke
Last Updated: Nov 3, 2012
48477 - NRC Website
Loading map...
v • d • e


Retrieved from "https://kanterella.com/w/index.php?title=ENS_48477&oldid=423503"