ENS 40625
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ENS Event | |
|---|---|
13:40 Mar 30, 2004 | |
| Title | Automatic Reactor Scram During Turbine Thrust Bearing Wear Detector Testing |
| Event Description | At 0740 hours0.00856 days <br />0.206 hours <br />0.00122 weeks <br />2.8157e-4 months <br /> [CST] during testing of the turbine thrust bearing wear detector, a main turbine trip occurred. This resulted in an automatic reactor scram due to turbine stop valve closure. Following the scram all Group II (Primary Containment) and Group III (Reactor Water Cleanup) isolations occurred as expected. All essential equipment functioned as required. Unit 2 remains in Mode 3 with reactor water level in the normal level band. An investigation into the Unit 2 turbine trip is in progress.
Unit 1 was unaffected by the event and remains at 85% power. All control rods fully inserted. Decay heat is being removed via steam to the main condenser using the bypass valves. The Licensee notified the NRC Resident inspector. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-3 h-0.125 days <br />-0.0179 weeks <br />-0.00411 months <br />) | |
| Opened: | Jim Stortz 10:40 Mar 30, 2004 |
| NRC Officer: | Bill Gott |
| Last Updated: | Mar 30, 2004 |
| 40625 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (72 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 571412024-05-23T16:46:00023 May 2024 16:46:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Scram Due to Turbine Trip Signal ENS 566762023-08-11T08:29:00011 August 2023 08:29:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram ENS 562102022-11-04T19:00:0004 November 2022 19:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Scram Due to Rising Water Level ENS 559752022-07-04T06:04:0004 July 2022 06:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Reactor Manual Scram Due to Lowering Reactor Water Level ENS 542392019-08-25T16:02:00025 August 2019 16:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Scram Due to Main Generator Ground Fault Relay ENS 536262018-09-26T05:00:00026 September 2018 05:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Scram Due to Generator Output Breaker Trip ENS 509492015-04-03T02:33:0003 April 2015 02:33:00 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 Steam Leak ENS 499882014-04-02T18:40:0002 April 2014 18:40:00 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 Alert Declared Due to Fire in Unit 2 Turbine Building ENS 478472012-04-18T20:11:00018 April 2012 20:11:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit Two Automatic Reactor Scram on High Reactor Pressure ENS 469512011-06-13T10:10:00013 June 2011 10:10:00 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 Steam Leak in Turbine Building ENS 461842010-08-17T19:14:00017 August 2010 19:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Initiated Due to Recirculation Pump Trip ENS 461692010-08-12T08:58:00012 August 2010 08:58:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Reactor Automatic Scram Due to Turbine Trip ENS 431982007-02-28T07:20:00028 February 2007 07:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 2 Reactor Manually Scrammed Due to Decreasing Condenser Vacuum ENS 423562006-02-22T07:22:00022 February 2006 07:22:00 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 Valid Main Turbine Load Reject Signal ENS 417822005-06-17T16:20:00017 June 2005 16:20:00 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 Ehc Malfunction ENS 406252004-03-30T13:40:00030 March 2004 13:40:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Scram During Turbine Thrust Bearing Wear Detector Testing 2024-05-23T16:46:00 | |
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