ENS 41229
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ENS Event | |
|---|---|
05:09 Nov 29, 2004 | |
| Title | Technical Specifications Required Shutdown Due to Dropped Control Rod |
| Event Description | Dropped rod E-11 in Shut Down Bank 'B' at 2334 on 11/28/04 while performing Low Power Physics Testing after refueling. Shutdown bank not fully withdrawn with dropped rod placed Unit 3 in Tech Spec Action Statement 3.0.3. RX trip breakers were opened at 0009 [11/29/04]. Unit 3 entered 3-EOP-E.O, Reactor Trip or Safety Injection, the unit was placed in Mode 3 and transitioned to 3-EOP-ES-0.1, Reactor Trip Response and then into 3-GOP-301. All plant equipment responded as required and the unit remains stable in mode 3 while the Rod Control failure is investigated.
The licensee notified the NRC resident inspector.
The purpose of this update is to clarify that the reactor was not critical at the time of reactor trip. The dropped rod added sufficient negative reactivity to render the reactor subcritical prior to the manual reactor trip. The cause of the dropped rod was an intermittent contact in a pin connector associated with rod E-11. The licensee will inform the NRC Resident Inspector. Notified R2DO (Landis). |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-3.55 h-0.148 days <br />-0.0211 weeks <br />-0.00486 months <br />) | |
| Opened: | Tim Jones 01:36 Nov 29, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Jan 11, 2005 |
| 41229 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | Yes, Manual Scram |
| Before | Startup (0 %) |
| After | Hot Standby (0 %) |
Turkey Point with 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
WEEKMONTHYEARENS 568132023-10-25T01:59:00025 October 2023 01:59:00
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Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 3C Main Steam Isolation Valve Problems ENS 444182008-08-15T20:04:00015 August 2008 20:04:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Shut Down Required by Technical Specifications ENS 440092008-02-26T18:09:00026 February 2008 18:09:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Units 3 and 4 Tripped Due to Grid Fluctuations ENS 439192008-01-18T22:44:00018 January 2008 22:44:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Two Inoperable Rod Position Indicators in the Same Rod Group ENS 438962008-01-12T10:41:00012 January 2008 10:41:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Two Rod Position Indicators (Rpis) Out in One Rod Bank ENS 438882008-01-10T10:02:00010 January 2008 10:02:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Two Rod Position Indicators (Rpis) Out in One Rod Bank ENS 434082007-06-06T11:45:0006 June 2007 11:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Initiated on Unit 3 ENS 423992006-03-08T20:53:0008 March 2006 20:53:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Actuation of Emergency Diesel Generators ENS 421372005-11-11T20:02:00011 November 2005 20:02:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip During Startup Following Failure of Rod Control Power Cabinet ENS 421042005-11-01T03:27:0001 November 2005 03:27:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declaration: Loss of Offsite Power Due to Loss of Startup Transformer ENS 420562005-10-15T11:02:00015 October 2005 11:02:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auxiliary Feedwater Actuation on a Manual Reactor Trip ENS 418002005-06-27T07:16:00027 June 2005 07:16:00 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 Declaration of an Unusual Event Due Transformer Fire >10 Minutes ENS 415112005-03-22T08:47:00022 March 2005 08:47:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Manually Tripped Following Loss of Main Feed Pump ENS 412982004-12-29T03:46:00029 December 2004 03:46:00 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 Generator Exciter Cooling Water Leak ENS 412322004-11-30T13:50:00030 November 2004 13:50:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Dropped Control Rod ENS 412292004-11-29T05:09:00029 November 2004 05:09:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specifications Required Shutdown Due to Dropped Control Rod ENS 407522004-05-14T21:29:00014 May 2004 21:29:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Scram Due to Lowering Steam Generator Level 2023-09-22T22:19:00 | |
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