ENS 43227
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ENS Event | |
|---|---|
16:43 Mar 9, 2007 | |
| Title | Manual Reactor Trip at Reduced Power Due to Inadequate Feedwater Control |
| Event Description | At approximately 0803 Central Standard Time (CST) on 3/9/2007, Callaway Plant received indications of a condenser tube leak. At approximately 0826 CST, a power reduction from 100 percent to less than 5 percent was initiated in accordance with the Secondary Water Chemistry Program. At 1043 CST, with the reactor at approximately 30 percent power, a manual reactor trip was initiated due to inadequate feedwater control to the C steam generator. There was indication of feedwater flow to and increasing level in the C steam generator with both the main feedwater reg valve and its bypass valve closed. Cause of the inadequate feedwater control is under investigation.
All safety systems functioned as designed with the exception of the digital rod position indication for control rod K10 which failed during the trip due to an existing problem. Control rod K10 is believed to be fully inserted, but is being treated as indeterminate at this time. Main feedwater isolation and motor-driven auxiliary feedwater actuations occurred as expected. Both trains of the emergency diesel generators and the offsite power supplies are available. Callaway plant is currently stable in Mode 3 at normal reactor coolant system parameters. This notification is being made in accordance with 10CFR50.72(b)(2)(iv)(B) for manual reactor trip (RPS actuation), 10CFR50.72(b)(2)(xi) for offsite notification and 10CFR50.72(b)(3)(iv)(A) Specified System Actuation. The licensee informed the resident inspector of the event and will be making State notifications. A press release is expected.
Repairs were made to the Digital Rod Position Indication (DRPI) for control rod K10. The cause was determined to be a bent pin on a cable connector. When DRPI was restored, control rod K10 was verified to be fully inserted. Post maintenance testing was completed satisfactorily. The cause of the inadequate feedwater control for the C steam generator was a failure of the positioner for the C main feedwater reg valve. The positioner was replaced and tested satisfactory. The plant is currently in Mode 2 (Startup) The resident inspector was informed of the update. R4DO (Mike Shannon) notified. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| 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 | |
| Time - Person (Reporting Time:+-1.68 h-0.07 days <br />-0.01 weeks <br />-0.0023 months <br />) | |
| Opened: | David G. Lantz 15:02 Mar 9, 2007 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Mar 12, 2007 |
| 43227 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
Callaway 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 569682024-02-15T08:47:00015 February 2024 08:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Turbine Trip/Reactor Trip ENS 564012023-03-09T17:53:0009 March 2023 17:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Injured Worker ENS 556982022-01-07T18:23:0007 January 2022 18:23:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Turbine Trip / Reactor Trip ENS 552592021-05-14T18:00:00014 May 2021 18:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Individual Fall from Scaffold Ladder - Other Government Agency Notification ENS 550492020-12-24T18:35:00024 December 2020 18:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Turbine and Reactor Trip ENS 549162020-09-27T07:03:00027 September 2020 07:03:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation | Automatic Reactor Trip ENS 546392020-04-04T06:15:0004 April 2020 06:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 540692019-05-17T04:03:00017 May 2019 04:03:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation En Revision Imported Date 6/6/2019 ENS 540052019-04-17T06:37:00017 April 2019 06:37:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Undervoltage to a Safety Related Bus Resulting in Valid System Actuation ENS 537172018-11-05T05:00:0005 November 2018 05:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Chemical Spill Offsite ENS 518462016-04-03T04:02:0003 April 2016 04:02:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Protection System Actuation While Reactor Shutdown ENS 513082015-08-11T06:39:00011 August 2015 06:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip After an Offsite Electrical Fault ENS 512572015-07-23T18:57:00023 July 2015 18:57:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auxiliary Feedwater Manual Start Due to Loss of Main Feedwater Pump During Plant Cooldown ENS 512532015-07-23T06:15:00023 July 2015 06:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Plant Shutdown Due to Rcs Leakage ENS 506502014-12-03T06:22:0003 December 2014 06:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Turbine Trip ENS 504652014-09-17T14:13:00017 September 2014 14:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Tanker Truck Spill ENS 503332014-07-31T19:30:00031 July 2014 19:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Tritium and Cobalt Detected in Ground Water Monitoring Well ENS 492192013-07-27T04:49:00027 July 2013 04:49:00 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(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to a Fire in the Turbine Building Lasting Greater than 15 Minutes ENS 488792013-04-02T22:07:0002 April 2013 22:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Electrical Fault in Switchyard Resulting in Personnel Injuries ENS 482682012-09-02T15:31:0002 September 2012 15:31:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Non-Radiological Leakage from the Neutralization Tank ENS 482362012-08-27T20:26:00027 August 2012 20:26:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hazardous Material Spill ENS 468142011-05-03T15:36:0003 May 2011 15:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to Offsite Agency Regarding Potable Water Residual Chlorine Level ENS 459892010-06-08T09:30:0008 June 2010 09:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Minor Hydazine Spill ENS 458372010-04-13T17:00:00013 April 2010 17:00:00 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 an Identified Leakage Exceeding 25 Gallons Per Minute ENS 457152010-02-20T03:45:00020 February 2010 03:45:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuations Due to Loss of the 'A' Safeguards Transformer ENS 447192008-12-14T23:14:00014 December 2008 23:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Electrical Fault on an Operating Condensate Pump ENS 447172008-12-12T16:42:00012 December 2008 16:42:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent Valid Reactor Trip and Feedwater Isolation Signals Due to Maintenance ENS 447142008-12-12T05:01:00012 December 2008 05:01:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to a Feedwater Transient ENS 446522008-11-12T00:46:00012 November 2008 00:46:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to a Feedpump Trip ENS 445612008-10-11T10:08:00011 October 2008 10:08:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Steam Generator Water Level Trip Actuation Initiated Reactor Trip System ENS 432812007-04-05T15:23:0005 April 2007 15:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Alert Declared Due to Report of a Fire in the Control Building ENS 432272007-03-09T16:43:0009 March 2007 16:43:00 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 Manual Reactor Trip at Reduced Power Due to Inadequate Feedwater Control ENS 429522006-10-31T06:00:00031 October 2006 06:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Contractor Employee Fatality ENS 426762006-06-30T18:00:00030 June 2006 18:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Low Levels of Tritium Found Along Plant Discharge Line ENS 426212006-06-06T18:39:0006 June 2006 18:39:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of "a" Train of Offsite Vital Power Due to Relay Testing ENS 425822006-05-17T20:03:00017 May 2006 20:03:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release News Release and Notification to Other Government Agencies - Planned Plant Shutdown ENS 425772006-05-16T11:30:00016 May 2006 11:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Employee Death ENS 425712006-05-12T05:53:00012 May 2006 05:53:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip on High Steam Generator Level ENS 415462005-03-29T16:57:00029 March 2005 16:57:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Actuation of the Reactor Protection System and Auxiliary Feedwater System While Establishing Initial Conditions for Leak Test in Mode 3. ENS 415372005-03-28T18:48:00028 March 2005 18:48:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of a Forced Outage Expected to Last Longer than Three Days. ENS 413472005-01-19T18:51:00019 January 2005 18:51:00 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 Callaway Automatic Reactor Trip on Low Steam Generator Level ENS 405222004-02-15T21:19:00015 February 2004 21:19:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip with Auxiliary Feedwater Actuation ENS 405152004-02-12T04:58:00012 February 2004 04:58:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Eccs Actuation During Rcs Heatup ENS 405072004-02-05T23:01:0005 February 2004 23:01:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Missouri Public Service Commission ENS 405002004-02-03T10:39:0003 February 2004 10:39:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Main Genrator Output Breakers Opening. ENS 404842004-01-27T23:30:00027 January 2004 23:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 403172003-11-12T20:21:00012 November 2003 20:21:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Inadvertent Actuation of Essential Service Water System 2024-02-15T08:47:00 [Table view] | |
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