ENS 41646
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ENS Event | |
|---|---|
11:19 Apr 28, 2005 | |
| Title | Unit 2 Manual Reactor Scram Due to Loss of Main Transformer Cooling |
| Event Description | At approximately 0700 U2 B Main Transformer cooling was lost. Unit 2 reactor power was reduced from 100% to 75%. Attempts to restore the 2B Main Transformer cooling were unsuccessful, and Unit 2 was manually scrammed from 75% reactor power. RPV water level decreased to -30" due to the SCRAM and was restored by normal Feedwater and RCIC injection. The Main Condenser remained available as a heat sink and there were no SRV lifts. The low water level did result in receiving the Level 2 Division 2 containment isolation signal (-38"), and all expected isolations and initiations did occur.
This event requires a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> ENS notification in accordance with 10CFR50.72(b)(2)(iv)(B) for an RPS actuation when critical, and an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ENS notification per 10CFR50.72(b)(3)(iv)(A) for the injection from RCIC and receipt of the level 2 Containment Isolation signal. Additionally, a press release to the public will be issued, and requires a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> ENS notification in accordance with 10CFR50.72(b)(2)(xi). All rods fully inserted during the manual scram. The electrical system is in a normal shutdown lineup. Secondary containment ventilation was momentarily disrupted in unit-1 and successfully restored. The licensee notified the NRC Resident Inspector and will be notifying the state and media concerning this event. |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| 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:+-2.02 h-0.0842 days <br />-0.012 weeks <br />-0.00277 months <br />) | |
| Opened: | Ron Fry 09:18 Apr 28, 2005 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 28, 2005 |
| 41646 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (75 %) |
| After | Hot Shutdown (0 %) |
Susquehanna 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 580122025-10-28T23:04:00028 October 2025 23:04:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation RPS Actuation and Offsite Notification ENS 578222025-07-22T19:10:00022 July 2025 19:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Manual Reactor Scram ENS 568462023-11-10T08:14:00010 November 2023 08:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram ENS 564522023-04-04T23:15:0004 April 2023 23:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 564302023-03-23T21:36:00023 March 2023 21:36:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Actuation ENS 559092022-05-23T21:16:00023 May 2022 21:16:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Scram ENS 556162021-11-30T17:54:00030 November 2021 17:54:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Automatic Scram ENS 555142021-10-11T17:21:00011 October 2021 17:21:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Scram After Main Turbine Trip ENS 553702021-07-21T22:26:00021 July 2021 22:26:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor SCRAM ENS 546912020-05-03T12:21:0003 May 2020 12:21:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Main Turbine Trip ENS 545252020-02-14T05:25:00014 February 2020 05:25:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Rising Condenser Backpressure ENS 541372019-06-27T13:37:00027 June 2019 13:37:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Power Resulted in a Valid Isolation Signal ENS 527952017-06-08T19:27:0008 June 2017 19:27:00 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, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Scram After Main Turbine Control Logic Loss of Power ENS 519252016-05-13T05:10:00013 May 2016 05:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Manual Reactor Scram Due After Loss of an Essential Motor Control Center ENS 518382016-03-31T10:03:00031 March 2016 10:03:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Isolation Signal Due to a Human Performance Error ENS 515322015-11-12T16:32:00012 November 2015 16:32:00 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 513752015-09-07T13:25:0007 September 2015 13:25:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 509732015-04-11T03:46:00011 April 2015 03:46:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Caused by Main Turbine Trip Due to Degrading Main Condenser Vacuum ENS 506902014-12-17T18:35:00017 December 2014 18:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sewage Leak ENS 493442013-09-15T15:23:00015 September 2013 15:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared at Susquehanna Unit 2 Due to Flooding in a Rhr Pump Room ENS 493422013-09-14T07:30:00014 September 2013 07:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Feedwater Transient During Shutdown ENS 490992013-06-07T16:03:0007 June 2013 16:03:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Scram Due to a Reactor Water Level Transient During Startup ENS 486072012-12-19T22:31:00019 December 2012 22:31:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Due to Low Reactor Pressure Vessel Level ENS 485982012-12-16T06:56:00016 December 2012 06:56:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Reactor Scram from 98% Power During Turbine Control Valve Testing ENS 485402012-11-27T22:20:00027 November 2012 22:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Fatality ENS 485002012-11-09T09:20:0009 November 2012 09:20:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Rps Actuation Resulting from Low Reactor Water Level ENS 484962012-11-09T06:18:0009 November 2012 06:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Unit 2 Manual Scram Due to Loss of the Integrated Control System ENS 480552012-06-28T17:53:00028 June 2012 17:53:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of One of Two Offsite Power Sources ENS 471722011-08-19T14:46:00019 August 2011 14:46:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram During Quarterly Surveillance Test ENS 465692011-01-25T11:10:00025 January 2011 11:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to an Unisolable Extraction Steam System Leak ENS 461072010-07-19T16:00:00019 July 2010 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Commonwealth of Pennsylvania Due to Tritium Discovered in Processed Water ENS 461032010-07-16T20:41:00016 July 2010 20:41:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Scram Due to Unisolable Circulating Water System Leak ENS 460572010-06-30T13:55:00030 June 2010 13:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sulfuric Acid Spill Onsite ENS 459302010-05-15T03:01:00015 May 2010 03:01:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Increasing Reactor Water Level ENS 458662010-04-22T14:51:00022 April 2010 14:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram on Low Reactor Vessel Water Level During Feedwater Integrated Control System Testing ENS 457062010-02-17T19:20:00017 February 2010 19:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to Pennslyvania Department of Environmental Protection Concerning Drinking Water Quality ENS 455342009-12-01T23:00:0001 December 2009 23:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Onsite Flooding Caused by Make-Up Supply Line Failure ENS 442572008-06-02T18:40:0002 June 2008 18:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Shipping Cask Arrives with a Loose Bolt ENS 439182008-01-18T22:03:00018 January 2008 22:03:00 10 CFR 20.1906(d)(2), 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Receipt of Package That Exceeded Allowable Contact Dose Rate ENS 435892007-08-23T17:00:00023 August 2007 17:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Involving a 70 Gallon Diesel Spill within 1 Mile of the Site Boundary ENS 430602006-12-21T19:00:00021 December 2006 19:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Actuation of Emergency Sirens ENS 430552006-12-18T16:00:00018 December 2006 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Actuation of Off-Site Emergency Sirens ENS 430112006-11-26T01:42:00026 November 2006 01:42:00 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 Reactor Scram from Full Power Due to Generator Load Reject ENS 426422006-06-15T07:00:00015 June 2006 07:00:00 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, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Reactor Scram While Shifting Power Supplies ENS 423792006-03-02T02:27:0002 March 2006 02:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Halon Discharge in Security Control Center ENS 420342005-10-03T16:48:0003 October 2005 16:48:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Made to Pennsylvania Emergency Management Agency (Pema) ENS 417462005-06-06T16:33:0006 June 2005 16:33:00 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 Apparent Generator Load Rejection ENS 416462005-04-28T11:19:00028 April 2005 11:19:00 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 Unit 2 Manual Reactor Scram Due to Loss of Main Transformer Cooling ENS 414622005-03-04T20:10:0004 March 2005 20:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared ENS 412812004-12-22T20:00:00022 December 2004 20:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Made to Pennsylvania Emergency Management Agency (Pema) ENS 407772004-05-26T20:00:00026 May 2004 20:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Off Site Notification ENS 407112004-04-28T17:07:00028 April 2004 17:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Decleared Due to an Electrical Failure in a Non-Vital Load Center Located in the Unit 2 Reactor Building ENS 406952004-04-21T20:35:00021 April 2004 20:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram in Response to High Main Turbine Vibration During Startup ENS 406162004-03-28T11:37:00028 March 2004 11:37:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Three Car Accident ENS 405742004-03-07T07:01:0007 March 2004 07:01:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Start of the "a" Emergency Diesel Generator During Emergency Service Supply Bus Outage ENS 405712004-03-06T10:28:0006 March 2004 10:28:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification at Susquehanna Involving a Traffic Accident ENS 405642004-03-03T17:45:0003 March 2004 17:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Injured Individual ENS 405542004-02-28T05:54:00028 February 2004 05:54:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State Based on Medical Transport of Injured Worker ENS 405352004-02-21T15:05:00021 February 2004 15:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Medical Event at Susquehanna ENS 405312004-02-18T05:00:00018 February 2004 05:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Pema of Mislabeled Container ENS 404862004-01-29T01:33:00029 January 2004 01:33:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Local Law Enforcement Due to Fire Brigade Activation ENS 404492004-01-15T00:50:00015 January 2004 00:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Accident Involving 2 Trucks Carrying Empty New Fuel Shipping Containers ENS 403672003-12-02T19:15:0002 December 2003 19:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Onsite Fatality ENS 401962003-09-24T04:53:00024 September 2003 04:53:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Scram at Susquehanna on Low Water Level ENS 401472003-09-11T04:40:00011 September 2003 04:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Made to Pennsylvania Emergency Management Agency (Pema) 2025-07-22T19:10:00 | |
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