ENS 45409
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ENS Event | |
|---|---|
22:34 Oct 3, 2009 | |
| Title | Automatic Reactor Scram Following Msiv Closure |
| Event Description | On 10/03/09 at 1734 CDT, Unit 3 scrammed due to a Group 1 MSIV closure. The cause of the event is being investigated. The 2/3 Emergency Diesel Generator also auto-started during the event. The cause of the auto start is also being investigated.
All rods fully inserted. The reactor is currently stable in Mode 3 with makeup water coming from the control rod drive system and decay heat removal from the isolation condenser. All systems functioned as required with the exception of the unexplained MSIV closure and the auto start of the 2/3 EDG. There was no impact on Unit 2 and the plant is in a normal post-scram electrical lineup. There was no need for the 2/3 EDG to auto-start and it did not load. Group 2 and 3 isolations were also received during the transient which is expected and normal. Reactor water level is being maintained between 8 and 48 inches and pressure between 800 and 1060 psi. Investigation of the cause of the MSIV closure is in progress The licensee stated that there were no activities or surveillances in progress at the time that could have caused the MSIV closure. The NRC Resident Inspector has been notified. |
| 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:+-2.13 h-0.0888 days <br />-0.0127 weeks <br />-0.00292 months <br />) | |
| Opened: | Frank Winter 20:26 Oct 3, 2009 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Oct 3, 2009 |
| 45409 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (99 %) |
| 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 559882022-07-12T13:03:00012 July 2022 13:03:00
[Table view]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. 2022-07-12T13:03:00 | |
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