ENS 48125
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ENS Event | |
|---|---|
07:29 Jul 23, 2012 | |
| Title | Unusual Event Due to Loss of Offsite Power |
| Event Description | At 0329 EDT, Oyster Creek experienced a loss of offsite power. As a result of the loss of offsite power, the unit automatically scrammed from 100% with all control rods fully inserting and all safety systems functioning as required. Both Emergency Diesel Generators automatically started and are carrying loads on the safety buses.
At 0341 EDT, Oyster Creek declared an Unusual Event based on a loss of offsite power for greater than 15 minutes. The unit is stable in Hot Shutdown with decay heat removal via the Isolation Condenser. The cause of the loss of offsite power is currently under investigation by JCP&L. The licensee notified the State and local agencies, as well as the NRC Resident Inspector. The licensee will be making a press release.
Oyster Creek has terminated from the loss of offsite power Unusual Event [at 0538 EDT]. All safety systems functioned as expected for this event. The licensee has notified the NRC Resident Inspector. Notified R1DO (Dimitriadis), NRR EO (Nieh), IRD (Gott), DHS SWO, FEMA, and DHS NICC.
As a result of the loss of offsite power, both Emergency Diesel Generators automatically started and carried loads on the safety buses, as required. Offsite power was returned to service at 0457 EDT and both Emergency Diesel Generators were secured at 0520 EDT. Per 50.72(b)(3)(iv)(A), Oyster Creek is reporting any event or condition that results in valid actuation of an Emergency AC electrical power system. Additionally, the Reactor Building (Secondary Containment) differential pressure indicated positive 0.25 inches W.G. at approximately 0357 EDT. Reactor Building differential pressure indication returned to normal at 0434 EDT. Oyster Creek is currently investigating the cause of the positive Reactor Building pressure indication. Per 50.72(b)(3)(v)(C), Oyster Creek is reporting an event that could have prevented the fulfillment of the safety function of a system needed to control the release of radioactive material. The licensee notified the NRC Resident Inspector. Notified R1DO (Gray).
As a result of further investigation it was found that the Reactor Building Differential Pressure issue was an indication issue only and not indicative of a loss of the secondary containment barrier. The positive indication was caused by a degradation of instrument air pressure to the instrument used to generate the differential pressure indication. The degradation of instrument air pressure was an expected condition caused by the loss of offsite power. Alternate indication, not affected by instrument air pressure, was available throughout the event. The alternate indication read negative 0.4 Inches water gauge throughout the event. Based on this information Oyster Creek is retracting the portion of this report that was reported per 50.72(b)(3)(v)(C), an event that could have prevented the fulfillment of the safety function of a system needed to control the release of radioactive material. The licensee has notified the NRC Resident Inspector. R1DO (Newport) notified. |
| Where | |
|---|---|
| Oyster Creek New Jersey (NRC Region 1) | |
| 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)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-3.08 h-0.128 days <br />-0.0183 weeks <br />-0.00422 months <br />) | |
| Opened: | Robert Sales 04:24 Jul 23, 2012 |
| NRC Officer: | Dong Park |
| Last Updated: | Sep 12, 2012 |
| 48125 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Oyster Creek 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 543472019-10-24T19:24:00024 October 2019 19:24:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 531532018-01-06T10:24:0006 January 2018 10:24:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Declaration of Unusual Event Due to Abnormal Intake Structure Level ENS 528392017-07-03T14:15:0003 July 2017 14:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram on Low Condenser Vacuum ENS 523812016-11-20T08:42:00020 November 2016 08:42:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram During Main Turbine Testing ENS 522302016-09-09T14:23:0009 September 2016 14:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Local Authorities Due to Out-Of-Service Sewage Radiation Monitor ENS 520302016-06-21T20:46:00021 June 2016 20:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Sodium Hypochlorite Spill ENS 518952016-04-30T22:04:00030 April 2016 22:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram During Reactor Startup Due to Increase in Unidentified Leak Rate ENS 516342016-01-04T11:00:0004 January 2016 11:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Emergency Diesel Engine Coolant Leak ENS 510552015-05-07T21:27:0007 May 2015 21:27:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Turbine Trip ENS 509162015-03-22T18:14:00022 March 2015 18:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Scram Due to Aprm Hi Hi Signal ENS 505242014-10-12T06:51:00012 October 2014 06:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Decreasing Reactor Water Level ENS 502702014-07-11T07:14:00011 July 2014 07:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Due to Loss of Main Condenser Vacuum ENS 501452014-05-28T14:37:00028 May 2014 14:37:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Release of Chlorinated Water ENS 498502014-02-22T21:37:00022 February 2014 21:37:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Concerning a Small Hydraulic Fluid Spill ENS 496482013-12-18T00:57:00018 December 2013 00:57:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Protection System (Rps) Actuation with the Reactor in Hot Shutdown ENS 496332013-12-14T08:37:00014 December 2013 08:37:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Due to Rise in Reactor Pressure During Turbine Valve Testing ENS 495702013-11-21T22:37:00021 November 2013 22:37:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Njdep Concerning a Small Sodium Hypochlorite Spill ENS 494142013-10-06T15:30:0006 October 2013 15:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Degraded Condenser Vacuum ENS 494042013-10-03T10:43:0003 October 2013 10:43:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram During Startup ENS 492002013-07-17T20:05:00017 July 2013 20:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Chemical Spill Onsite ENS 484602012-10-31T03:40:00031 October 2012 03:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the National Marine Fisheries Service ENS 484522012-10-29T22:55:00029 October 2012 22:55:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Notice of Unusual Event Declared Due to High Intake Structure Water Level ENS 481252012-07-23T07:29:00023 July 2012 07:29:00 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 Due to Loss of Offsite Power ENS 481022012-07-13T16:00:00013 July 2012 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Intermittent Signal Interference with Emergency Sirens ENS 480522012-06-27T20:30:00027 June 2012 20:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Actuation of an Emergency Siren ENS 480242012-06-14T10:07:00014 June 2012 10:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service and Offsite Notification Due to Loss of Power to Site Emergency Building ENS 475202011-12-12T21:50:00012 December 2011 21:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of New Jersey Due to High Opacity of Diesel Exhaust ENS 472132011-08-28T12:58:00028 August 2011 12:58:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Emergency Sirens Out of Service ENS 471882011-08-23T18:05:00023 August 2011 18:05:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of an Unusual Event Due to a Seismic Event ENS 471072011-07-29T01:15:00029 July 2011 01:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Fish Kill Event ENS 465072010-12-23T19:07:00023 December 2010 19:07:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Scram During Startup ENS 464952010-12-20T13:05:00020 December 2010 13:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Fish Kill Caused by Rate of Temperature Change in Discharge Canal ENS 464432010-12-01T19:55:0001 December 2010 19:55:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Excessive Rcs Leakage from "B" Recirc Pump Seal ENS 463152010-10-07T14:41:0007 October 2010 14:41:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of 4160 Volt Safety Bus ENS 452992009-08-25T23:35:00025 August 2009 23:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Water Leak Containing Tritium ENS 451962009-07-12T05:48:00012 July 2009 05:48:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 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 a Loss of Offsite Power ENS 450212009-04-25T22:05:00025 April 2009 22:05:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Following Loss of Cooling to Main Transformer ENS 449932009-04-15T20:44:00015 April 2009 20:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Potential Release of Tritium ENS 448222009-02-02T02:56:0002 February 2009 02:56:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event and Reactor Scram Due to Main Transformer Fire ENS 446882008-11-29T02:01:00029 November 2008 02:01:00 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(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Due to Main Transformer Fault ENS 446122008-10-29T23:15:00029 October 2008 23:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Spill of a Hazardous Substance ENS 439892008-02-14T21:04:00014 February 2008 21:04:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of New Jersey ENS 438542007-12-19T16:45:00019 December 2007 16:45:00 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 Manual Reactor Scram Due to Lowering Reactor Level ENS 435022007-07-18T19:49:00018 July 2007 19:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Spill of Ethylene Glycol Reported to State ENS 434952007-07-17T09:22:00017 July 2007 09:22:00 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(b)(3)(iv)(A), System Actuation Automatic Reactor Scram on Low Reactor Vessel Water Level (Rvwl) ENS 433382007-05-03T05:46:0003 May 2007 05:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release to Environment ENS 432492007-03-19T22:16:00019 March 2007 22:16:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Made to New Jersey Department of Environmental Protection ENS 431072007-01-19T19:10:00019 January 2007 19:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Press Release ENS 430532006-12-15T22:15:00015 December 2006 22:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release for Low Levels of Cesium-137 Contamination Identified on Site ENS 425582006-05-06T10:07:0006 May 2006 10:07:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Manual Reactor Scram During Shutdown ENS 422932006-01-29T09:40:00029 January 2006 09:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 421552005-11-19T02:19:00019 November 2005 02:19:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Lost Power to Circulating Water Dilution Pump Elevating Discharge Temperatures to Bay ENS 419452005-08-25T03:37:00025 August 2005 03:37:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Automatic Start Due to Bus Supply Breaker Trip ENS 418992005-08-06T08:03:0006 August 2005 08:03:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Low Intake Water Level ENS 417412005-06-02T01:09:0002 June 2005 01:09:00 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 Reactor Scram Due to Generator Trip/Turbine Trip Following Offsite Electical Transient ENS 410392004-09-14T19:00:00014 September 2004 19:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of New Jersey ENS 409652004-08-17T17:15:00017 August 2004 17:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Possible Discharge Permit Violation ENS 408082004-06-11T19:10:00011 June 2004 19:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Oil Laden Water Into Storm Drain ENS 407782004-05-27T04:33:00027 May 2004 04:33:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram While Performing Scheduled Shutdown ENS 406562004-04-08T16:55:0008 April 2004 16:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Law Suite Settlement ENS 404562004-01-17T04:16:00017 January 2004 04:16:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Noue Declared at Oyster Creek Due to Intake Low Water Level ENS 401972003-09-24T18:55:00024 September 2003 18:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Recovery of Live Sea Turtle ENS 400952003-08-22T06:59:00022 August 2003 06:59:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Turbine Trip Causes Automatic Reactor Scram at Oyster Creek 2019-10-24T19:24:00 | |
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