ENS 44147
ENS Event | |
|---|---|
10:02 Apr 18, 2008 | |
| Title | Unusual Event Declared Due to Seismic Activity |
| Event Description | At 06:02 on April 18 2008, DC Cook Units 1 and 2 entered the Emergency Plan for a confirmed seismic event based on ground motion felt by plant personnel. An immediate notification to the NRC is required under 10 CFR 50.72(a)(3) for entry into the Emergency Plan. The ground motion sensed by plant personnel was confirmed with the National Earthquake Center. A magnitude 5.4 preliminary (Richter scale) earthquake was confirmed in Southern Illinois at LATITUDE 38.481 North/LONGITUDE 87.826 West.
The Earthquake Abnormal Operating Procedures were entered for both Units. Ground motion was not felt by the control room operating crews, but was noted and reported by other plant personnel. Plant Process Computer trends of Unit 1 RWST level, South Boric Acid Storage Tank Level and North Chemical and Volume Control System Hold Up Tank Level indicated ground motion. No damage to plant equipment was noted during the initial evaluation of plant status. Investigation of the plant impact of the sensed ground motion is in progress. The NRC Resident Inspectors were notified by phone call. Current Plant status: Unit 1 is shutdown in Mode 6 with Residual Heat Removal Cooling. Unit 2 is operating in Mode 1 at 100% power. AEP system Operations was contacted and the GRID was described as stable and no electrical operations relating to the earthquake event. The Seismic Monitoring system was INOPERABLE as required by TRO 8.3.2, Cond. B, during the event for routine surveillance. This surveillance has been in progress since 03/26/08. No alarms were generated by the seismic monitoring system during this event.
At 0905 EDT on 04/18/08, the licensee terminated the Unusual Event based on completion of system walk downs which confirmed no damage to the facility. The licensee informed the NRC Resident Inspector. Notified R3DO (Kozak), NRR (MJ Ross-Lee), IRD (McDermott), FEMA (Liggett) and DHS (Barnes).
A press release regarding the declaration of the emergency was issued and a subsequent press release is planned to address the termination. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi)." The licensee informed the NRC Resident Inspector. Notified R3DO (Kozak).
At 11:45 on April 18, 2008, D.C. Cook Units 1 and 2 entered the Emergency Plan for a confirmed seismic event based on ground motion felt by plant personnel. An immediate notification to the NRC is required under 10 CFR 50.72(a)(3) for entry into the Emergency Plan. The ground motion sensed by plant personnel was confirmed with the National Earthquake Center. A magnitude 4.6 (preliminary on Richter scale) earthquake-aftershock was confined in Southern Illinois at LATITUDE 38.483 North/LONGITUDE 87.39 West at 10:14 CDT / 11:14 EDT. The Earthquake Abnormal Operating Procedures were entered for both Units. Ground motion was not felt by the control room Operating crews, but was noted and reported by other plant personnel. No damage to plant equipment was noted during the initial evaluation of plant status. Investigation of the plant impact of the sensed ground motion is in progress. The NRC Resident Inspectors were notified in person. Current Plant status: Unit 1 is shutdown in Mode 6 with Residual Heat Removal Cooling. Unit 2 is operating in Mode 1 at 100% power. AEP System Operations was contacted and the GRID was described as stable with no electrical operations relating to the earthquake event. The Seismic Monitoring system was INOPERABLE as required by TRO 8.3.2, Condition B during the event for routine Surveillance. This Surveillance has been in progress since 03/26/08. No alarms were generated by the seismic monitoring system during this event. One of four channels is currently out of service. The three remaining seismic monitor channels indicated no ground acceleration above the lowest instrument activation level of 0.02g. D.C. Cook intends to issue a press release regarding the declaration of the Notification of Unusual Event emergency classification. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi).
At 16:00 on April 18, 2008, DC Cook terminated the Unusual Event specified in EN 44147 for the aftershock response described above. A press release regarding the emergency event termination is anticipated. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi). The licensee notified the NRC Resident Inspector. Notified R3DO (Kozak), NRR EO (Ross-Lee), IRD (McDermott), DHS (Gomez), FEMA (Burckhardt). |
| Where | |
|---|---|
Cook  Michigan (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.7 h-0.154 days <br />-0.022 weeks <br />-0.00507 months <br />) | |
| Opened: | Todd Chamberlain 06:20 Apr 18, 2008 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Apr 18, 2008 |
| 44147 - 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 44147\u003C/a\u003E - \u003Ca href=\"/Cook\" title=\"Cook\"\u003ECook\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EUnusual Event Declared Due to Seismic Activity\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 44147 - Cook\n","link":"","lat":41.97790555555556,"lon":-86.56431666666667,"icon":"/w/images/3/39/American_Electric_Power_icon.png"}],"imageoverlays":null} | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Cook with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 574112024-11-04T04:12:0004 November 2024 04:12:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Rapidly Terminated Unusual Event Due to Fire Alarm in Containment ENS 556912022-01-06T15:44:0006 January 2022 15:44:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire in the Aux Cable Vault ENS 547292020-05-27T13:12:00027 May 2020 13:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Actuation of Sirens ENS 540362019-04-30T00:29:00030 April 2019 00:29:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Spurious Actuation of an Emergency Siren ENS 529672017-09-13T04:47:00013 September 2017 04:47:00 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 Due to Letdown Relief Valve Discharge to the Pressurizer Relief Tank ENS 526492017-03-30T07:10:00030 March 2017 07:10:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Loss of All Control Room Annunciators ENS 525852017-03-01T18:03:0001 March 2017 18:03:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Offsite Agencies Due to Sulfuric Acid Leak within the D.C. Cook Protected Area ENS 520652016-07-06T04:38:0006 July 2016 04:38:00 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(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip and Unusual Event Declaration Due to Steam Leak in Turbine Building ENS 518592016-04-08T22:20:0008 April 2016 22:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Leak in a Switchyard Transformer Oil System ENS 508222015-02-13T18:15:00013 February 2015 18:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Michigan Osha ENS 506972014-12-20T17:12:00020 December 2014 17:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Leak from Main Turbine Lube Oil System ENS 504982014-09-28T12:30:00028 September 2014 12:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Activation of an Emergency Siren ENS 504622014-09-16T19:19:00016 September 2014 19:19:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications and Press Release Regarding Onsite Fatality ENS 503862014-08-21T06:10:00021 August 2014 06:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Suspected Fuel Oil Leak to the Environment ENS 501882014-06-11T03:27:00011 June 2014 03:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Inadvertent Activation of an Emergency Siren ENS 493642013-09-20T02:30:00020 September 2013 02:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Inadvertent Activation of an Emergency Siren ENS 489452013-04-19T03:12:00019 April 2013 03:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Activation of an Emergency Siren ENS 487472013-02-12T20:30:00012 February 2013 20:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Offsite Agencies Due to Discovery of Potential Human Remains ENS 487312013-02-07T22:35:0007 February 2013 22:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Related to Death of Contractor Onsite ENS 478642012-04-26T02:46:00026 April 2012 02:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to Offsite Agencies Due to Oil Spill ENS 471942011-08-23T18:24:00023 August 2011 18:24:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of an Unusual Event Due to a Seismic Event ENS 462342010-09-08T11:47:0008 September 2010 11:47:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Body Discovered in the Owner Controlled Area ENS 460372010-06-23T18:28:00023 June 2010 18:28:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Declaration of Unusual Event Due to Seismic Event ENS 445072008-09-21T00:18:00021 September 2008 00:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manual Reactor Trip from 100% Power Due to a Fire in the Main Turbine ENS 441472008-04-18T10:02:00018 April 2008 10:02:00 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 Due to Seismic Activity ENS 404022003-12-19T23:44:00019 December 2003 23:44:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event 2024-11-04T04:12:00 | |