ENS 47364
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ENS Event | |
|---|---|
17:50 Oct 21, 2011 | |
| Title | Automatic Reactor Scram Due to Lockout of Auxiliary Power Transformer |
| Event Description | The station experienced a lockout of the 2R Auxiliary Power Transformer. The resulting transient caused an automatic actuation of the RPS system. All control rods fully inserted. A Group 2 Primary Containment isolation occurred. Both 11 and 12 Emergency Diesel Generators started on a loss of voltage signal. Equipment response was that the 11 ESW [Emergency Service Water] pump (cooling for the #11 Emergency Diesel) failed to develop required pressure. The #13-4160V non-safety related bus failed to restore after the transient [and feed the Division 1 Essential Bus]. Additionally, the #15 bus transferred to the 1AR transformer [and is feeding the Essential Bus].
The #11 Emergency Diesel Generator is currently tagged out of service. Electrical supply is being provided by offsite power. Reactor heat is being removed through the main steam line to the main condenser and reactor water inventory is being provided by the feedwater system. The SRVs lifted and reseated. The HPCI system was manually place into a pressure control mode. The Minnesota Pollution Control Agency is being notified due to the licensee violating the site discharge canal temperature rate of change limit. The licensee notified the NRC Resident Inspector.
Prior to this event the 'B' Control Room Emergency Filtration (CREF) and 'B' Control Room Ventilation (CRV) Systems were inoperable for planned maintenance. On 10-21-11 at 1325 CDT, the #11 EDG ESW Pump was declared inoperable due to low cooling water pump flow, resulting in the #11 EDG being inoperable, which in turn resulted in the 'A' CREF and 'A' CRV being inoperable. Contrary to reporting requirements this condition was not identified and reported pursuant to 10 CFR 50.72(b)(3)(v)(D) as required within 8-hours in the previous event notification. This condition resulted in a loss of safety function for both divisions of CREF and CRV. This update amends the 10-21-11 event notification to include this as an 8-hour non-emergency event pursuant to 10 CFR 50.72(b)(3)(v)(D). The licensee notified the NRC Resident Inspector. Notified the R3DO (Nick Valos) |
| Where | |
|---|---|
Monticello  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.13 h-0.0471 days <br />-0.00673 weeks <br />-0.00155 months <br />) | |
| Opened: | Tom Proell 16:42 Oct 21, 2011 |
| NRC Officer: | Vince Klco |
| Last Updated: | Nov 1, 2011 |
| 47364 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Monticello with 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 | |
WEEKMONTHYEARENS 578322025-07-29T01:58:00029 July 2025 01:58:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Manual Reactor Scram ENS 576182025-03-19T16:36:00019 March 2025 16:36:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram ENS 574982025-01-16T17:50:00016 January 2025 17:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 574122024-11-04T11:00:0004 November 2024 11:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Inadvertent Siren Actuation ENS 570022024-03-01T19:45:0001 March 2024 19:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Siren Activation ENS 569952024-02-28T14:39:00028 February 2024 14:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram 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 565352023-05-22T23:38:00022 May 2023 23:38:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to Another Government Agency ENS 562362022-11-22T21:30:00022 November 2022 21:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Environmental Report to Another Government Agency ENS 527152017-04-28T21:43:00028 April 2017 21:43:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for Release of Wastewater 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 521562016-08-05T15:14:0005 August 2016 15:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Drinking Water Exceeding Limits ENS 520202016-06-18T07:59:00018 June 2016 07:59:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Spurious Emergency Siren Activation ENS 515662015-11-24T18:53:00024 November 2015 18:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for a Discharge Canal Temperature Change Causing a Fish Kill 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 513062015-08-10T20:35:00010 August 2015 20:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Activation of a Single Emergency Siren ENS 512412015-07-20T13:55:00020 July 2015 13:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Spurious Actuation of Emergency Siren ENS 500522014-04-23T15:00:00023 April 2014 15:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Deceased Migratory Bird Found on Plant Property ENS 500492014-04-22T19:00:00022 April 2014 19:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Deceased Migratory Bird Found on Plant Property ENS 500262014-04-11T02:00:00011 April 2014 02:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Dead Duck Found on Site ENS 498762014-03-05T21:00:0005 March 2014 21:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 72.75(b)(2), Offsite Notification Offsite Notification Due to Dry Shielded Canister Test Results ENS 497412014-01-18T09:38:00018 January 2014 09:38:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Discharge Canal Temperature Drop ENS 497142014-01-11T07:00:00011 January 2014 07:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Decreasing Discharge Temperature ENS 491812013-07-08T22:00:0008 July 2013 22:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sodium Hypochlorite Spill 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 490102013-05-08T11:23:0008 May 2013 11:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Emergency Siren Spurious Actuation ENS 488052013-03-04T15:27:0004 March 2013 15:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Fish Kill ENS 487542013-02-14T23:10:00014 February 2013 23:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Release of Amertap Balls Into the Mississippi River ENS 486812013-01-18T18:40:00018 January 2013 18:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Pans System False Activation of 58 Sirens 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 483432012-09-25T20:00:00025 September 2012 20:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hydraulic Leak 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 479482012-05-22T22:13:00022 May 2012 22:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Loss of Amertap Balls ENS 477822012-03-28T21:48:00028 March 2012 21:48:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Potential Release of Amertap Balls to Mississippi ENS 477252012-03-08T15:54:0008 March 2012 15:54:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of the Minnesota Pollution Control Agency for Release of Amertap Balls ENS 476642012-02-15T14:25:00015 February 2012 14:25:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Manual Siren Activation ENS 474642011-11-21T22:06:00021 November 2011 22:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Fish Kill 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 466572011-03-05T16:45:0005 March 2011 16:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Related to Fish Kill 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 464072010-11-09T17:39:0009 November 2010 17:39:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Violation of the Discharge Permit ENS 461132010-07-21T13:16:00021 July 2010 13:16:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Manual Initiation of Emergency Alert Sirens ENS 460232010-06-17T15:45:00017 June 2010 15:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Initiation of Emergency Preparedness Sirens ENS 453382009-09-10T14:13:00010 September 2009 14:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release State Offsite Notification Due to Not Meeting Permit Requirements ENS 449072009-03-16T14:00:00016 March 2009 14:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Fish Kill During Routine Shutdown ENS 446332008-11-06T17:15:0006 November 2008 17:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of a Discharge to the Mississippi River 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 431742007-02-20T14:30:00020 February 2007 14:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite State Notification Required by Npdes Permit ENS 431142007-01-23T19:00:00023 January 2007 19:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Issued ENS 430952007-01-11T23:30:00011 January 2007 23:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State Agencies 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. ENS 405182004-02-13T13:30:00013 February 2004 13:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Loss of Offsite Communications 2025-07-29T01:58:00 | |
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