ENS 51614
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ENS Event | |
|---|---|
12:02 Dec 19, 2015 | |
| Title | Automatic Reactor Scram Due to Low Reactor Water Level |
| Event Description | At 0702 EST on 12/19/2015, the Unit 2 reactor automatically scrammed on a valid reactor low level signal (12.5 inches). The reactor low level signal was caused by the trip of the in-service 2A Reactor Feedwater Pump, causing reactor level to lower, exceeding the low reactor level setpoint of 12.5 inches.
The shutdown was normal. The plant is stable in Hot Shutdown with normal reactor level, pressure control via the Main Steam Bypass Valves to the Main Condenser and normal level control using the Condensate System. High level trip of the 2A Reactor Feedwater Pump was caused by high reactor level of +54 inches following opening of bypass valves during reactor start-up and pressurization. The cause is still being investigated. All systems functioned as expected following the reactor scram. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-1.4 h-0.0583 days <br />-0.00833 weeks <br />-0.00192 months <br />) | |
| Opened: | Kris Strausser 10:38 Dec 19, 2015 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Dec 19, 2015 |
| 51614 - NRC Website | |
WEEKMONTHYEARENS 549962020-11-13T07:45:00013 November 2020 07:45:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to High Reactor Pressure Signal ENS 540982019-06-04T05:45:0004 June 2019 05:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram During Rapid Plant Shutdown ENS 519682016-06-01T13:00:0001 June 2016 13:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Due to Unexpected Core Flow Change ENS 516142015-12-19T12:02:00019 December 2015 12:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Low Reactor Water Level ENS 508472015-02-24T02:40:00024 February 2015 02:40:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram on Reactor High Pressure Signal ENS 498712014-03-05T04:34:0005 March 2014 04:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Unit 1 Manually Scrammed During a Rapid Shutdown in Response to a Turbine Ehc Failure ENS 481172012-07-18T12:15:00018 July 2012 12:15:00 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 Flashover in the Load Center Transformer Cabinet ENS 478502012-04-19T11:53:00019 April 2012 11:53:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Manual Reactor Scram Following Loss of Recirculation Pumps ENS 469192011-06-03T14:21:0003 June 2011 14:21:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Following a Turbine Trip ENS 469032011-05-29T09:02:00029 May 2011 09:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip Due to Low Pressure in Ehc System ENS 466412011-02-25T14:10:00025 February 2011 14:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Due to Recirculation Pump Trip ENS 460422010-06-24T00:51:00024 June 2010 00:51:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Scram Following Loss of Both Recirculation Pumps ENS 440882008-03-22T23:39:00022 March 2008 23:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Turbine Trip Resulting in a Reactor Scram ENS 439492008-02-01T09:45:0001 February 2008 09:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram as a Result of Turbine Trip ENS 433152007-04-24T06:10:00024 April 2007 06:10:00 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 Automatic Reactor Scram with Eccs Injection on Lowering Reactor Vessel Water Level ENS 420542005-10-13T02:24:00013 October 2005 02:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Due to Reactor High Pressure Signal ENS 418482005-07-18T13:52:00018 July 2005 13:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram ENS 408322004-06-22T17:13:00022 June 2004 17:13:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Following an Electrical Yard Manipulation 2020-11-13T07:45:00 | |
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