ENS 44432: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 08/21/2008 16:06 PDT | | event date = 08/21/2008 16:06 PDT | ||
| last update date = 08/21/2008 | | last update date = 08/21/2008 | ||
| title = Automatic Reactor Scram Due | | title = Automatic Reactor Scram Due to a Main Turbine Trip | ||
| event text = Following a downpower to 65% for maintenance on one of the reactor feedwater turbines, a main turbine digital electro-hydraulic (DEH) quadvoter valve, that had failed a previous surveillance, was replaced. During the operability testing of the new DEH quadvoter valve, a leak developed. DEH reservoir level dropped 8 inches (approx. 52 gal) and tripped the main turbine on low DEH pressure. An automatic reactor trip occurred due the main turbine trip. All rods fully inserted. RPV pressure was controlled using the bypass valves and main steam line drains. No SRV's opened. RPV level was maintained using the feedwater and condensate system in the normal RPV level band. All other safety systems operated as designed. Off-site power is available. Three emergency diesel generators are operable and available. | | event text = Following a downpower to 65% for maintenance on one of the reactor feedwater turbines, a main turbine digital electro-hydraulic (DEH) quadvoter valve, that had failed a previous surveillance, was replaced. During the operability testing of the new DEH quadvoter valve, a leak developed. DEH reservoir level dropped 8 inches (approx. 52 gal) and tripped the main turbine on low DEH pressure. An automatic reactor trip occurred due the main turbine trip. All rods fully inserted. RPV pressure was controlled using the bypass valves and main steam line drains. No SRV's opened. RPV level was maintained using the feedwater and condensate system in the normal RPV level band. All other safety systems operated as designed. Off-site power is available. Three emergency diesel generators are operable and available. | ||
The licensee has notified the NRC Resident Inspector. | The licensee has notified the NRC Resident Inspector. | ||
Latest revision as of 22:13, 1 March 2018
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000397/LER-2008-001 |
| Time - Person (Reporting Time:+-0.6 h-0.025 days <br />-0.00357 weeks <br />-8.2188e-4 months <br />) | |
| Opened: | Marsha Eades 22:30 Aug 21, 2008 |
| NRC Officer: | Vince Klco |
| Last Updated: | Aug 21, 2008 |
| 44432 - NRC Website
| |