ENS 40475: Difference between revisions
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| event date = 01/25/2004 03:16 EST | | event date = 01/25/2004 03:16 EST | ||
| last update date = 02/25/2004 | | last update date = 02/25/2004 | ||
| title = Unplanned Auto Start | | title = Unplanned Auto Start of Turbine Driven Auxiliary Feedwater Pump | ||
| event text = At 0316, EST, on 25 January 2004, the Unit 2 turbine driven auxiliary feedwater pump (TDAFWP) was automatically started upon receipt of a valid start signal. The start of the pump was unplanned. At the time, the Unit 2 reactor was critical at [approximately] 0.001 % power as indicated on the Intermediate Range Nuclear Instruments (Unit 2 is emerging from a forced outage following main generator repairs). The steam generators were being supplied water by the motor-driven auxiliary feedwater pumps. | | event text = At 0316, EST, on 25 January 2004, the Unit 2 turbine driven auxiliary feedwater pump (TDAFWP) was automatically started upon receipt of a valid start signal. The start of the pump was unplanned. At the time, the Unit 2 reactor was critical at [approximately] 0.001 % power as indicated on the Intermediate Range Nuclear Instruments (Unit 2 is emerging from a forced outage following main generator repairs). The steam generators were being supplied water by the motor-driven auxiliary feedwater pumps. | ||
Shift operators were in the process of aligning the Unit 2 condensate system for cleanup and closed both (out of service) main feedwater pumps' suction isolation valves, as required by the procedure. Closure of a main feedwater pump's suction valve generates a main feedwater pump trip signal. Trip of both main feedwater pumps generates an automatic auxiliary feedwater system start signal. | Shift operators were in the process of aligning the Unit 2 condensate system for cleanup and closed both (out of service) main feedwater pumps' suction isolation valves, as required by the procedure. Closure of a main feedwater pump's suction valve generates a main feedwater pump trip signal. Trip of both main feedwater pumps generates an automatic auxiliary feedwater system start signal. | ||
Latest revision as of 22:24, 1 March 2018
| Where | |
|---|---|
Sequoyah  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.9 h0.0792 days <br />0.0113 weeks <br />0.0026 months <br />) | |
| Opened: | Herbert Eades 10:10 Jan 25, 2004 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Feb 25, 2004 |
| 40475 - NRC Website
| |