ENS 43495
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ENS Event | |
|---|---|
09:22 Jul 17, 2007 | |
| Title | Automatic Reactor Scram on Low Reactor Vessel Water Level (Rvwl) |
| Event Description | An automatic reactor scram occurred at 0522 on 07/17/07 due to a low reactor water level, following a trip of the 'C' Reactor Feed Pump. Reactor water level lowered to the low-low level setpoint and a reactor isolation occurred. Reactor level has been returned to the normal band and a reactor cooldown has been initiated using isolation condensers.
The cause of the "C" RFP trip is attributed to an electrical fault as sensed on ground sensing and differential sensing instrumentation. No flames or smoke was observed, however, operators reported an acrid smell of insulation. Following the automatic scram on low reactor water level [138" above top of active fuel (TAF)], level continued to decrease to the low-low setpoint of 86" TAF resulting in a reactor isolation signal. The reactor isolation signal initiates closure of the Main Steam Isolation Valves (MSIVs), trip of the Recirc Pumps and actuation of the Isolation Condensers. Current reactor pressure is 520 psig with a cooldown rate of 82F/hr. The licensee plans to issue a press release and will take the Unit to cold shutdown for repairs. The licensee informed the NRC Resident Inspector.
The following information reported under 10CFR50.72(b)(3)(iv)(A) was provided as an update: The following systems actuated upon receipt of a lo-lo reactor water level signal, subsequent to the reactor scram, reported under EN #43495, which occurred at 0522 on 07/17/07: MSIVs - Isolation Isolation Condensers - Initiation Standby Gas Treatment - Initiation Recirc Pumps - Trip Containment Valves - Isolation Core Spray - Start, but no injection Containment Spray - Manual initiation only, following use of EMRVs to control Rx pressure, causing elevated Torus water temperature. The licensee informed the NRC Resident Inspector. Notified R1DO (Krafty).
The following information reported under 10CFR50.72(b)(2)(xi) was provided as an update: Notified the New Jersey D.E.P. of an unplanned plant shutdown which occurred at 0522 07/17/07. There was no environmental impact from the plant shutdown. This notification is required to be made within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of an unplanned plant shutdown. The licensee informed the NRC Resident Inspector. Notified R1DO (Krafty). |
| Where | |
|---|---|
| Oyster Creek New Jersey (NRC Region 1) | |
| Reporting | |
| 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:+-2.87 h-0.12 days <br />-0.0171 weeks <br />-0.00393 months <br />) | |
| Opened: | Steve Fuller 06:30 Jul 17, 2007 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jul 17, 2007 |
| 43495 - 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(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 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 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 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 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 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 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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