ENS 41347: Difference between revisions

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| event date = 01/19/2005 12:51 CST
| event date = 01/19/2005 12:51 CST
| last update date = 01/19/2005
| last update date = 01/19/2005
| title = Callaway Automatic Reactor Trip On Low Steam Generator Level
| title = Callaway Automatic Reactor Trip on Low Steam Generator Level
| event text = Unit experienced an automatic reactor trip following a momentary loss of power to a process control system power supply that resulted in a low Steam Generator water level. This event is being reported in accordance with 10CFR50.72(b)(2)(iv)(B) due to an automatic Reactor Trip and subsequent Aux Feedwater actuation and Feedwater isolation.  On 1/19/2005 at 12:51 CST with Callaway plant at 100% reactor power, a Reactor Trip occurred on low Steam Generator 'A' level due to an apparent momentary loss of power in Control Cabinet [Relay Panel] RP043.
| event text = Unit experienced an automatic reactor trip following a momentary loss of power to a process control system power supply that resulted in a low Steam Generator water level. This event is being reported in accordance with 10CFR50.72(b)(2)(iv)(B) due to an automatic Reactor Trip and subsequent Aux Feedwater actuation and Feedwater isolation.  On 1/19/2005 at 12:51 CST with Callaway plant at 100% reactor power, a Reactor Trip occurred on low Steam Generator 'A' level due to an apparent momentary loss of power in Control Cabinet [Relay Panel] RP043.
A failed Primary Power Supply to RP043 replacement was in progress at the time of the trip. A momentary power spike on the in-service backup power supply caused the Main Feedwater Regulating valve [MFRV] 'A' to shut and both Main Feedwater Pumps [MFPs] went to their low speed stops.  Attempts by the Reactor Operator to take manual control of 'A' MFRV and the MFPs were unsuccessful resulting in the Reactor Trip.
A failed Primary Power Supply to RP043 replacement was in progress at the time of the trip. A momentary power spike on the in-service backup power supply caused the Main Feedwater Regulating valve [MFRV] 'A' to shut and both Main Feedwater Pumps [MFPs] went to their low speed stops.  Attempts by the Reactor Operator to take manual control of 'A' MFRV and the MFPs were unsuccessful resulting in the Reactor Trip.

Latest revision as of 21:21, 1 March 2018

ENS 41347 +/-
Where
Callaway Ameren icon.png
Missouri (NRC Region 4)
Reporting
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-2.95 h-0.123 days <br />-0.0176 weeks <br />-0.00404 months <br />)
Opened: Gary Olmstead
15:54 Jan 19, 2005
NRC Officer: Mark Abramovitz
Last Updated: Jan 19, 2005
41347 - NRC Website
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