ENS 46761
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ENS Event | |
|---|---|
22:55 Apr 16, 2011 | |
| Title | Unusual Event Declared Due to Loss of All Offsite Power from Tornado Damage |
| Event Description | At 1849 hrs, Surry Power Station (SPS) Unit 1 and Unit 2 experienced an automatic Reactor Trip from a Loss of Offsite Power, as a result of a tornado touching down in the station's switchyard. Unit 1 reactor tripped as a result of a Loss of Coolant Flow > P-8 (35% power), and the Unit 2 reactor tripped as a result of a 500 kV Leads Differential Turbine-Generator trip. Both units responded as designed.
Unit 1 electrical power is being provided by Number 1 Emergency Diesel Generator (EDG) to the 1H emergency bus, with the Station Blackout (SBO) diesel loaded on to the 1J emergency bus. Unit 2 electrical power is being supplied by the number 2 EDG to the 2H emergency bus, with the number 3 EDG loaded on to the 2J emergency bus. All Unit 1 control rods inserted on the reactor trip, and all Unit 2 control rods inserted on its respective reactor trip. The Low Level Intake Structure (LLIS) is without power. All three Emergency Service Water Pumps are running to supply the intake canal. Efforts are underway to restore Bus 7, which will give each unit an emergency bus powered by offsite power (Unit 1 1J, Unit 2 2H) and restore power to the LLIS. Decay heat is being removed by auxiliary feedwater on both units and atmospheric steam release via the steam generator PORVs. Both units are currently on natural circulation. All other system parameters are normal and stable. At 1855 hrs a NOUE was declared due to a loss of offsite power (applicable to U1 and U2). Additionally, due to an estimated 100 gallon fuel oil spill from an above ground storage tank near the station's garage, the Virginia State Department of Environmental Quality was notified at 2041 and the Surry County Local Emergency Planning Coordinator was notified at 2114. At 2334, the Virginia State Department of Environmental Quality was notified and the Surry County Local Emergency Planning Coordinator was notified at 2336, due to an estimated 200 gallon oil leak to the ground from a station switchyard transformer damaged during the tornado. The NRC Resident Inspector has been notified and is on-site. Notified DHS (Rickerson), FEMA (Boscoe), DOE (Turner), HHS (Hoskins), and USDA (Russell). See related EN #46762
The licensee exited the emergency condition at 0745 EDT on 4/19/11. Offsite power has been restored, and the plant is shutdown and cooled down. Notified R2DO (O'Donohue), NRR EO (Thorpe) and IRD (Gott). Informed the following Federal Agencies via Blast Dial: DHS, FEMA, USDA, HHS and DOE. |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.52 h-0.147 days <br />-0.021 weeks <br />-0.00482 months <br />) | |
| Opened: | Geoffrey Hill 19:24 Apr 16, 2011 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 19, 2011 |
| 46761 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (98 %) |
| After | Hot Shutdown (0 %) |
Surry 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(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 552992021-06-09T15:15:0009 June 2021 15:15:00
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Afw Initiation ENS 468662011-05-20T16:00:00020 May 2011 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Media Concern About Boat Near the Site ENS 467612011-04-16T22:55:00016 April 2011 22:55:00 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 Unusual Event Declared Due to Loss of All Offsite Power from Tornado Damage ENS 465842011-02-02T10:33:0002 February 2011 10:33:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Loss of Rcs Coolant Flow in One Loop ENS 459862010-06-08T13:48:0008 June 2010 13:48:00 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)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Trip with Safety Injection Due to Loss of Vital Ac Bus ENS 458712010-04-25T22:05:00025 April 2010 22:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release One Alarm Siren Initiated Spuriously ENS 455282009-11-29T15:45:00029 November 2009 15:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Trip from Intermediate Range Due to Rod Group Demand Counter Discrepancy ENS 455132009-11-21T05:00:00021 November 2009 05:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Rescue Squad for Offsite Injury of Hunters ENS 454932009-11-13T00:00:00013 November 2009 00:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to Us Coast Guard and Commonwealth of Virginia of Hazard to Navigation ENS 453272009-09-03T19:25:0003 September 2009 19:25:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Virginia Deq ENS 448912009-03-04T19:40:0004 March 2009 19:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Relief Valve Failure Results in Tritium and Cesium Spill ENS 442212008-05-17T13:04:00017 May 2008 13:04:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Failed Relay Causes Emergency Diesel Generator to Start ENS 441522008-04-21T02:16:00021 April 2008 02:16:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manual Reactor Trip Due to Main Turbine Vibrations ENS 428942006-10-09T15:24:0009 October 2006 15:24:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Potential Violation of Virginia Pollutant Discharge Elimination System Permit ENS 428882006-10-07T22:01:0007 October 2006 22:01:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Manual Scram Due to Unusual Noise in Turbine Building ENS 413832005-02-08T01:23:0008 February 2005 01:23:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip During Startup Due to Indication of Misaligned Rod ENS 412652004-12-15T15:06:00015 December 2004 15:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Military Flare Found in Water ENS 411762004-11-06T07:52:0006 November 2004 07:52:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to a Fire in the Unit 1 Turbine Basement ENS 407682004-05-22T01:16:00022 May 2004 01:16:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared ENS 407692004-05-22T01:08:00022 May 2004 01:08:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Generator Leads Failure ENS 403022003-11-07T13:30:0007 November 2003 13:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Release of Chemicals Into State Waters ENS 401682003-09-18T13:00:00018 September 2003 13:00:00 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 Unusual Event Declared Due to Expected Severe Weather ENS 437401976-10-22T18:00:00022 October 1976 18:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Small Leak - Tritium 2021-06-09T15:15:00 | |
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