ENS 50949
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ENS Event | |
|---|---|
02:33 Apr 3, 2015 | |
| Title | Manual Reactor Scram Due to Steam Leak |
| Event Description | On April 2, 2015 at 2133 CDT, a manual scram was inserted on Unit 1 following discovery of a steam leak in the Turbine Building at the D-ring, near the Turbine Bypass valves. Following the reactor scram, reactor water level decreased to approximately -2 inches, which resulted in an automatic Group II and Group III isolation (expected response). The steam leak was isolated by manual closure of the Main Steam Isolation Valves. All systems responded properly to the event. Unit 1 remains in Mode 3, with cooldown in progress. Reactor water level is in the normal level band. The cause and details of the event are under investigation. Unit 2 was unaffected by the event and remains at 100 percent power.
Operators reduced reactor power to 20 percent before initiating a SCRAM. All rods fully inserted and the reactor is shutdown and stable. The electrical supply is in a normal shutdown lineup. The reactor is being supplied by normal feedwater, and decay heat is being controlled by use of the ADS valves. The licensee is currently cooling down and depressurizing the reactor in preparation for repair of the steam leak. The licensee has notified the NRC Resident Inspector and the State of Illinois Resident Inspector. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000254/LER-2015-005 |
| Time - Person (Reporting Time:+-1.02 h-0.0425 days <br />-0.00607 weeks <br />-0.0014 months <br />) | |
| Opened: | John Vesely 01:32 Apr 3, 2015 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Apr 3, 2015 |
| 50949 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (20 %) |
| After | Hot Shutdown (0 %) |
Quad Cities with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 566762023-08-11T08:29:00011 August 2023 08:29:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic 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 551462021-03-20T01:30:00020 March 2021 01:30:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Actuation of Unit 1 Emergency Diesel Generator 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 536932018-10-24T05:00:00024 October 2018 05:00:00 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 1/2 Edg Auto Started and Lpci/Core Spray Inoperable Due to Loss of Safety Bus 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 425742006-05-14T14:57:00014 May 2006 14:57:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Automatic Start 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 2023-08-11T08:29:00 | |
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