ENS 50030
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
15:12 Apr 12, 2014 | |
| Title | Automatic Reactor Scram Due to Transformer Sudden Pressure Relay Actuation |
| Event Description | At 1012 CDT on April 12, 2014, Dresden Unit 2 automatically scrammed on TR-2 sudden pressure relay actuation. All rods inserted to their full-in positions.
Following the reactor scram, the 'A' reactor recirculation pump did not run back to minimum speed automatically. Operators took action to run the recirculation pump to minimum speed manually. All other systems operated as expected. Reactor vessel inventory and pressure are being maintained in automatic. The cause of the scram was due to a trip of the sudden pressure relay for Main Power Transformer 2. Troubleshooting is in progress to determine the cause [of the trip of the sudden pressure relay]. This condition is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B), any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical. Normal offsite power remains available. There was no impact on Unit 3. The NRC Resident Inspector has been informed. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-1.8 h-0.075 days <br />-0.0107 weeks <br />-0.00247 months <br />) | |
| Opened: | Ryan Chamberlin 13:24 Apr 12, 2014 |
| NRC Officer: | Charles Teal |
| Last Updated: | Apr 12, 2014 |
| 50030 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 50030\u003C/a\u003E - \u003Ca href=\"/Dresden\" title=\"Dresden\"\u003EDresden\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EAutomatic Reactor Scram Due to Transformer Sudden Pressure Relay Actuation\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 50030 - Dresden\n","link":"","lat":41.3886,"lon":-88.26909166666667,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
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 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_50030&oldid=422323"