ENS 40713
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ENS Event | |
|---|---|
20:36 Apr 28, 2004 | |
| Title | Manual Reactor Scram Due to Spurious Trip of 2A Reactor Recirculation Mg and Pump |
| Event Description | On 4/28/04 at 1536 [CDT], Dresden Unit 2 experienced a trip of the 2A Recirc MG set and associated recirc pump. This placed the unit in the immediate scram region of the power to flow map. The Unit NSO manually scrammed the reactor in accordance with the immediate operator actions of DOA 202.01.
Troubleshooting is in progress to determine the cause of the 2A Recirc MG set trip. There were no Electromatic Relief or Safety Relief Valve actuations. There were no ECCS initiations. PCIS Group 2 and Group 3 Isolations occurred as expected due to normal reactor water level decrease following the scram. All systems responded as expected following the reactor scram. This report is being made in accordance with 10 CFR 50.72 (b)(2)(iv)(B) for an actuation of the RPS and 10 CFR 50.72(b)(3)(iv)(A) for Group 2 and 3 actuations. All control rods fully inserted, the electrical grid is stable, ECCS and the EDGs remain operable. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Dresden  Illinois (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:+-1.77 h-0.0738 days <br />-0.0105 weeks <br />-0.00242 months <br />) | |
| Opened: | Mark Kenneman 18:50 Apr 28, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Apr 28, 2004 |
| 40713 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (66 %) |
| After | Hot Shutdown (0 %) |
Dresden with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 580082025-10-27T06:17:00027 October 2025 06:17:00
[Table view]10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Reactor Protection System Actuation While Shutdown ENS 559882022-07-12T13:03:00012 July 2022 13:03:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Turbine Trip on High Reactor Water Level ENS 555282021-10-16T09:28:00016 October 2021 09:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Following Turbine Trip ENS 540542019-05-09T08:48:0009 May 2019 08:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Turbine Trip ENS 507922015-02-06T18:27:0006 February 2015 18:27:00 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 Due to Loss of Feedwater ENS 507332015-01-14T01:04:00014 January 2015 01:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Unit 2 Manual Reactor Scram Due to Reactor Water Level Transient ENS 500852014-05-03T17:09:0003 May 2014 17:09:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Generator/Turbine Load Mismatch ENS 500302014-04-12T15:12:00012 April 2014 15:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Transformer Sudden Pressure Relay Actuation ENS 463252010-10-11T15:04:00011 October 2010 15:04:00 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 Transfer of Reactor Protection System Bus ENS 454092009-10-03T22:34:0003 October 2009 22:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Following Msiv Closure ENS 433462007-05-05T04:05:0005 May 2007 04:05:00 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 on Loss of Feedwater ENS 426852006-07-04T07:59:0004 July 2006 07:59:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram on Group 1 Isolation ENS 415172005-03-24T11:29:00024 March 2005 11:29:00 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 Automatic Scram Due to Main Steam High Flow Isolation Signal ENS 407132004-04-28T20:36:00028 April 2004 20:36:00 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 Spurious Trip of 2A Reactor Recirculation Mg and Pump ENS 407022004-04-24T11:03:00024 April 2004 11:03:00 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 Msiv Closure ENS 404912004-01-30T17:55:00030 January 2004 17:55:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Rps Actuation While Critical ENS 404742004-01-24T06:37:00024 January 2004 06:37:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auto Reactor Scram Due to Auto Main Turbine Trip ENS 403882003-12-12T05:35:00012 December 2003 05:35:00 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 Unexpected Stator Water Cooling Runback ENS 402092003-10-01T01:14:0001 October 2003 01:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram on Low Reactor Vessel Water Level. 2025-10-27T06:17:00 | |
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