ENS 43088
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ENS Event | |
|---|---|
21:28 Jan 10, 2007 | |
| Title | Reactor Scram with Stuck Open Main Turbine Control Valves |
| Event Description | At 1528 hours0.0177 days <br />0.424 hours <br />0.00253 weeks <br />5.81404e-4 months <br /> Central Time, a RPS trip occurred, all rods fully inserted. Turbine valve testing was in progress. A group 1 isolation occurred with all MSIVs closing. A partial group 2 occurred due to low reactor water level. All safety systems (valves) operated correctly. Currently reactor pressure/cooldown in progress using HPCI in pressure control, normal condensate and feedwater in service for reactor water level control. Investigation of cause is in progress.
Group isolations resulted from low pressure and low reactor water level. During the transient and subsequent cooldown, Operators manually opened the main steam relief valves to maintain pressure control in accordance with the plant EOPs. HPCI was manually started to maintain reactor level. The group 2 isolation has been reset. The group 1 isolation (MSIVs) will not be reset until after the main turbine control valves are shut. The plant is being cooled down to initiate RHR cooling and is in the normal shutdown electrical lineup. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Monticello  Minnesota (NRC Region 3) | |
| 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:+-1.7 h-0.0708 days <br />-0.0101 weeks <br />-0.00233 months <br />) | |
| Opened: | Robert Schreifels 19:46 Jan 10, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jan 10, 2007 |
| 43088 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (87 %) |
| After | Hot Shutdown (0 %) |
Monticello with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 569952024-02-28T14:39:00028 February 2024 14:39:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram ENS 567592023-09-27T15:41:00027 September 2023 15:41:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Actuation of Reactor Protection and Containment Isolation Systems ENS 526822017-04-15T09:41:00015 April 2017 09:41:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Reactor Protection System and Partial Primary Containment Isolation System Actuations on Low Water Level ENS 515602015-11-23T16:40:00023 November 2015 16:40:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram Due to a Reactor Recirculation Pump Lockout ENS 491132013-06-13T19:30:00013 June 2013 19:30:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Emergency Diesel Generators Start ENS 490662013-05-24T08:34:00024 May 2013 08:34:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Start of Emergency Diesel Generator Due to Bus Undervoltage ENS 485032012-11-12T21:51:00012 November 2012 21:51:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Building Isolation with Standby Gas Treatment System Actuation During Radioactive Material Move ENS 483412012-09-25T15:44:00025 September 2012 15:44:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram During Maintenance on 4160V Bus 12 Ammeter ENS 474602011-11-20T05:12:00020 November 2011 05:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram While Performing Turbine Bypass Valve Testing ENS 473642011-10-21T17:50:00021 October 2011 17:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Due to Lockout of Auxiliary Power Transformer ENS 464962010-12-20T09:57:00020 December 2010 09:57:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Fuel Pool/Reactor Building Exhaust Plenum Primary Power Supply Failed ENS 445082008-09-21T02:35:00021 September 2008 02:35:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Loss of Shutdown Cooling Due to Containment Isolation ENS 444982008-09-17T15:17:00017 September 2008 15:17:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Due to Loss of Shutdown Cooling ENS 444842008-09-12T03:47:00012 September 2008 03:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram and Isolation Due to Transformer Lockout ENS 432462007-03-18T04:46:00018 March 2007 04:46:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Rps Trip Signal and Containment Isolations Received During Maintenance ENS 430882007-01-10T21:28:00010 January 2007 21:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram with Stuck Open Main Turbine Control Valves ENS 414412005-02-25T03:11:00025 February 2005 03:11:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Esf Actuation Following Trip of Reactor Protection Motor-Generator Set ENS 414362005-02-23T18:00:00023 February 2005 18:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Potential Vulnerability with Alternate Shutdown System (Asds) Isolation Design. 2024-02-28T14:39:00 | |
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