ENS 50769
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ENS Event | |
|---|---|
09:02 Jan 27, 2015 | |
| Title | Automatic Reactor Scram on Turbine Trip Due to Loss of Offsite Power |
| Event Description | On Tuesday January 27, 2015 at 0402 hours0.00465 days <br />0.112 hours <br />6.646825e-4 weeks <br />1.52961e-4 months <br />, with the Pilgrim Nuclear Power Station (PNPS) Reactor Mode Select Switch (RMSS) in Run and reactor power approximately 52% an automatic reactor scram signal was received due to the automatic trip of the main turbine that was initiated by the opening of the main generator breaker, ACB-104. The event occurred during winter storm 'Juno.' Prior to the event off-site transmission Line 355 was de-energized due [to] weather conditions and its associated PNPS switchyard breakers (ACB-105, a main generator breaker and ACB-102), were open. Per station procedures, reactor power was being lowered, a reactor protection system bus had been placed onto a back-up power supply, the Emergency Diesel Generators had been started and were powering the associated safety related 4 KV buses. The second off-site transmission Line 342 de-energized and the associated PNPS switchyard breakers (ACB-104 main generator breaker and ACB-103) opened. The Shutdown Transformer off-site power supply has remained available throughout this event. All control rods were verified to be fully inserted. Per plant design, Primary Containment Isolation System (PCIS) Group lI sampling systems, Group VI Reactor Water Clean-up (RWCU) system and Reactor Building Isolation System (RBIS) isolations occurred. Currently, the EDG's are powering the safety related 4KV buses, reactor water level is being maintained by the Reactor Core Isolation Cooling (RCIC) system and reactor pressure is being maintained by High Pressure Coolant Injection (HPCI) system. The station is conducting a plant cool down at this time. All systems responded as designed with the exception of a non-safety-related diesel air compressor, K-117 that failed to start.
The licensee will notify the State and local governments and plans on issuing a press release. The NRC Resident Inspector has been informed. |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 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 | |
| LER: | 05000293/LER-2015-001 |
| Time - Person (Reporting Time:+-2.35 h-0.0979 days <br />-0.014 weeks <br />-0.00322 months <br />) | |
| Opened: | Grant Flynn 06:41 Jan 27, 2015 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jan 27, 2015 |
| 50769 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (52 %) |
| After | Hot Shutdown (0 %) |
Pilgrim 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 574192024-11-11T20:10:00011 November 2024 20:10:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 558442022-04-15T14:00:00015 April 2022 14:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Environmental Report to Another Government Agency ENS 555672021-11-09T15:40:0009 November 2021 15:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Violation of Discharge Permit ENS 552022021-04-21T11:52:00021 April 2021 11:52:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Commonwealth of Massachusetts ENS 550712021-01-18T21:00:00018 January 2021 21:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Leak from Underground Sewage Storage Tank ENS 540712019-05-18T03:03:00018 May 2019 03:03:00 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 Degrading Condenser Vacuum ENS 536482018-10-05T04:00:0005 October 2018 04:00:00 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 Low Reactor Water Level ENS 531472018-01-04T19:10:0004 January 2018 19:10:00 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 Partial Loss of Offsite Power During Winter Storm ENS 524492016-12-20T23:30:00020 December 2016 23:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 522312016-09-09T21:39:0009 September 2016 21:39:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 522232016-09-06T12:27:0006 September 2016 12:27:00 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 High Reactor Water Level ENS 513382015-08-22T20:28:00022 August 2015 20:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram Due to a Single Msiv Closure ENS 510872015-05-22T14:02:00022 May 2015 14:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Loss of Condenser Vacuum ENS 507692015-01-27T09:02:00027 January 2015 09:02:00 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 Turbine Trip Due to Loss of Offsite Power ENS 501342014-05-23T16:10:00023 May 2014 16:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of Reportable Quantity ENS 494542013-10-19T07:31:00019 October 2013 07:31:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Group 1 Isolation Due to High Reactor Water Level ENS 492962013-08-22T11:55:00022 August 2013 11:55:00 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 Protection Actuation (Scram) ENS 490532013-05-20T07:53:00020 May 2013 07:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Off-Site Notification Due to Fire in Turbine Building ENS 489232013-04-15T02:17:00015 April 2013 02:17:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuations While Shutting Down ENS 489092013-04-10T17:14:00010 April 2013 17:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Massachusetts Agencies Notified Regarding Neutralizing Sump Discharge Line Inspection ENS 487392013-02-10T19:05:00010 February 2013 19:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Offsite Power and Subsequent Press Release ENS 487362013-02-09T03:00:0009 February 2013 03:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Loss of Offsite Power ENS 486692013-01-12T14:50:00012 January 2013 14:50:00 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 Potential Security Event ENS 486652013-01-11T11:55:00011 January 2013 11:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Regarding Manual Reactor Scram ENS 486642013-01-10T20:34:00010 January 2013 20:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Protection Actuation (Scram) - Recirculation Pump Trip ENS 484392012-10-24T23:20:00024 October 2012 23:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 480782012-07-08T20:27:0008 July 2012 20:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Commonwealth of Massachusetts Notified That Pilgrim Station Workers Ratify New Contract ENS 480592012-06-29T21:46:00029 June 2012 21:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Employee Medical Emergency ENS 479972012-06-06T04:45:0006 June 2012 04:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Regarding Labor Negotiations ENS 479682012-05-26T06:00:00026 May 2012 06:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 479452012-05-22T17:11:00022 May 2012 17:11:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Degrading Condenser Vacuum ENS 479272012-05-17T01:00:00017 May 2012 01:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 471992011-08-26T17:45:00026 August 2011 17:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Related to Hurricane Preparations at the Pilgrim Site ENS 468372011-05-10T17:15:00010 May 2011 17:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Protection System Actuation During Start-Up ENS 466312011-02-20T15:34:00020 February 2011 15:34:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Protection System Actuation While Shutdown ENS 462062010-08-25T12:30:00025 August 2010 12:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 460832010-07-09T04:00:0009 July 2010 04:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Elevated Levels of Tritium Found in a Well Sample ENS 449982009-04-18T05:20:00018 April 2009 05:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Courtesy Notification Made to State of Massachusetts Involving an Employee Fatality ENS 447372008-12-20T15:45:00020 December 2008 15:45:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Momentary Loss of 345Kv Offsite Power ENS 447352008-12-19T23:31:00019 December 2008 23:31:00 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 Load Reject ENS 442172008-05-16T00:00:00016 May 2008 00:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of Massachusetts Regarding Press Release ENS 436422007-09-14T14:50:00014 September 2007 14:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Epa Required by Npdes Permit ENS 434792007-07-10T23:54:00010 July 2007 23:54:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Main Turbine Trip Causing a Reactor Scram ENS 432452007-03-17T20:58:00017 March 2007 20:58:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Group Isolations Following Manual Reactor Scram ENS 427502006-08-02T09:45:0002 August 2006 09:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Motor Vehicle Fatality of Plant Employee ENS 424142006-03-13T23:08:00013 March 2006 23:08:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram After Offgas System Failure 2024-11-11T20:10:00 | |
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