ENS 40100: Difference between revisions

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| event date = 08/25/2003 09:45 EDT
| event date = 08/25/2003 09:45 EDT
| last update date = 08/25/2003
| last update date = 08/25/2003
| title = Automatic Turbine Trip/Reactor Trip Due To A Sudden Pressure Relay Signal From Main Transformer Bank "1C
| title = Automatic Turbine Trip/Reactor Trip Due to a Sudden Pressure Relay Signal from Main Transformer Bank "1C
| event text = On August 25, 2003, Watts Bar (WBN) Unit 1 was operating at 100 percent power when there was an operation of a "Sudden Pressure Relay" for Main Transformer Bank 1C. The actuation of the relay resulted in a turbine trip and a subsequent reactor trip at approximately 0945 EDT. The cause of the relay actuation is under investigation at this time. All control rods inserted as required and the safety systems actuated as designed including the motor and turbine driven pumps for the Auxiliary Feedwater (AFW) System.  AFW pump 1B-B was inoperable at the time of the trip due to work on an area cooler.  However, the pump was available for service and started as required.  Unit 1 is currently stable in Mode 3 and will remain in this mode until the completion of the investigation into the cause of the trip.
| event text = On August 25, 2003, Watts Bar (WBN) Unit 1 was operating at 100 percent power when there was an operation of a "Sudden Pressure Relay" for Main Transformer Bank 1C. The actuation of the relay resulted in a turbine trip and a subsequent reactor trip at approximately 0945 EDT. The cause of the relay actuation is under investigation at this time. All control rods inserted as required and the safety systems actuated as designed including the motor and turbine driven pumps for the Auxiliary Feedwater (AFW) System.  AFW pump 1B-B was inoperable at the time of the trip due to work on an area cooler.  However, the pump was available for service and started as required.  Unit 1 is currently stable in Mode 3 and will remain in this mode until the completion of the investigation into the cause of the trip.
At the time of the Sudden Pressure Relay for Main Transformer Bank 1C, an oil sample was being taken of the Transformer.  Fire Brigade was sent but there was no fire and no explosion to the Transformer.  The electrical grid is stable, and Emergency Core Cooling systems and the Emergency Diesel Generators are fully operable if needed.  At this time only the 1B-B Motor Driven Auxiliary Feedwater pump is still operating.   
At the time of the Sudden Pressure Relay for Main Transformer Bank 1C, an oil sample was being taken of the Transformer.  Fire Brigade was sent but there was no fire and no explosion to the Transformer.  The electrical grid is stable, and Emergency Core Cooling systems and the Emergency Diesel Generators are fully operable if needed.  At this time only the 1B-B Motor Driven Auxiliary Feedwater pump is still operating.   

Latest revision as of 21:25, 1 March 2018

ENS 40100 +/-
Where
Watts Bar Tennessee Valley Authority icon.png
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:+4.3 h0.179 days <br />0.0256 weeks <br />0.00589 months <br />)
Opened: John Roden
18:03 Aug 25, 2003
NRC Officer: John Mackinnon
Last Updated: Aug 25, 2003
40100 - NRC Website
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