ENS 55988
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ENS Event | |
|---|---|
13:03 Jul 12, 2022 | |
| Title | Automatic Reactor Scram Due to Turbine Trip on High Reactor Water Level |
| Event Description | The following information was provided by the licensee via fax or email:
At 0803 EDT on 7/12/2022, with the Unit 2 in Mode 1 at 100% power, an automatic scram was received on Unit 2 following a turbine trip due to high reactor water level. The trip was uncomplicated with all systems responding normally post trip. All rods inserted to their full-in positions. Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). The cause of the transient is under investigation. Operations responded using the Emergency Operating Procedure and stabilized the plant in Mode 3. Decay heat is being removed using the steam bypass valves to the condenser and the safety relief valves did not lift as a result of the trip. Reactor vessel inventory and pressure are being maintained in normal control bands. Unit 3 was not affected by this transient. There was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-1.27 h-0.0529 days <br />-0.00756 weeks <br />-0.00174 months <br />) | |
| Opened: | Alexander Rehn 11:47 Jul 12, 2022 |
| NRC Officer: | Bill Gott |
| Last Updated: | Jul 12, 2022 |
| 55988 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 559882022-07-12T13:03:00012 July 2022 13:03:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Turbine Trip on High Reactor Water Level ENS 555282021-10-16T09:28:00016 October 2021 09:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Scram Following Turbine Trip ENS 540542019-05-09T08:48:0009 May 2019 08:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Turbine Trip ENS 507922015-02-06T18:27:0006 February 2015 18:27:00 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 Due to Loss of Feedwater ENS 507332015-01-14T01:04:00014 January 2015 01:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Unit 2 Manual Reactor Scram Due to Reactor Water Level Transient ENS 500852014-05-03T17:09:0003 May 2014 17:09:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Generator/Turbine Load Mismatch ENS 500302014-04-12T15:12:00012 April 2014 15:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram Due to Transformer Sudden Pressure Relay Actuation ENS 463252010-10-11T15:04:00011 October 2010 15:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram During Transfer of Reactor Protection System Bus ENS 454092009-10-03T22:34:0003 October 2009 22:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram Following Msiv Closure ENS 433462007-05-05T04:05:0005 May 2007 04:05:00 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 Manual Reactor Scram on Loss of Feedwater ENS 426852006-07-04T07:59:0004 July 2006 07:59:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Scram on Group 1 Isolation ENS 415172005-03-24T11:29:00024 March 2005 11:29:00 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 Automatic Scram Due to Main Steam High Flow Isolation Signal ENS 407132004-04-28T20:36:00028 April 2004 20:36:00 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 Spurious Trip of 2A Reactor Recirculation Mg and Pump ENS 407022004-04-24T11:03:00024 April 2004 11:03:00 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 Msiv Closure ENS 404912004-01-30T17:55:00030 January 2004 17:55:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Rps Actuation While Critical ENS 404742004-01-24T06:37:00024 January 2004 06:37:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auto Reactor Scram Due to Auto Main Turbine Trip ENS 403882003-12-12T05:35:00012 December 2003 05:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Scram Due to Unexpected Stator Water Cooling Runback ENS 402092003-10-01T01:14:0001 October 2003 01:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram on Low Reactor Vessel Water Level. 2022-07-12T13:03:00 | |
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