ENS 48829: Difference between revisions
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| event date = 03/19/2013 04:02 CDT | | event date = 03/19/2013 04:02 CDT | ||
| last update date = 03/19/2013 | | last update date = 03/19/2013 | ||
| title = Manual Reactor Scram Due | | title = Manual Reactor Scram Due to Lowering Condenser Vacuum | ||
| event text = At 0402 [CDT] on 03/19/2013, the Unit 1 reactor was manually scrammed due to lowering main condenser vacuum. The cause of the loss of vacuum was a significant leak on the 1C feedwater heater level control line. The leak appeared as a steam/water leak near the penetration to the main condenser. As extraction steam was isolated, condenser vacuum deteriorated and was approaching the turbine trip setpoint, at which time the reactor was manually scrammed. Condenser vacuum recovered following the scram. MSIVs [Main Steam Isolation Valves] are open, main turbine bypass valves are controlling reactor pressure and reactor feedwater pumps are being used to control reactor water level. | | event text = At 0402 [CDT] on 03/19/2013, the Unit 1 reactor was manually scrammed due to lowering main condenser vacuum. The cause of the loss of vacuum was a significant leak on the 1C feedwater heater level control line. The leak appeared as a steam/water leak near the penetration to the main condenser. As extraction steam was isolated, condenser vacuum deteriorated and was approaching the turbine trip setpoint, at which time the reactor was manually scrammed. Condenser vacuum recovered following the scram. MSIVs [Main Steam Isolation Valves] are open, main turbine bypass valves are controlling reactor pressure and reactor feedwater pumps are being used to control reactor water level. | ||
All expected containment isolation and initiation signals (Groups 2, 3, 6, and 8) were received. Upon receipt of these signals all required components actuated as required. In response to the scram, all plant equipment responded as designed. The reactor had been operating near 95% power for several hours due to the 1C3 heater isolating at 2334 [hrs. CDT] on 3/18/13. | All expected containment isolation and initiation signals (Groups 2, 3, 6, and 8) were received. Upon receipt of these signals all required components actuated as required. In response to the scram, all plant equipment responded as designed. The reactor had been operating near 95% power for several hours due to the 1C3 heater isolating at 2334 [hrs. CDT] on 3/18/13. |
Latest revision as of 22:01, 1 March 2018
Where | |
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Browns Ferry Alabama (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:+-0.42 h-0.0175 days <br />-0.0025 weeks <br />-5.75316e-4 months <br />) | |
Opened: | David Hall 08:37 Mar 19, 2013 |
NRC Officer: | Howie Crouch |
Last Updated: | Mar 19, 2013 |
48829 - NRC Website
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