ENS 42484
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
03:42 Apr 9, 2006 | |
| Title | Control Element Assembly Stuck During Physics Testing |
| Event Description | During the performance of PSTP-2, Low Power Physics Testing on U-1 for Regulating Control Element Assemblies Group 2, CEA #21 was declared untrippable, Technical Specification 3.1.4.F, CEA Alignment, was entered and Plant shutdown to Mode 3 was commenced at 2342 on 4/8/06.
The reactor is shutdown in Mode 3. The licensee borated to maintain adequate shutdown margin. The reactor trip breakers were opened but CEA #21 remains not fully inserted into the core. The licensee is currently troubleshooting to determine the cause of the stuck CEA. Offsite power is stable and powers the safety buses. Emergency Diesel Generators are available. The licensee is currently at normal operating pressure and temperature with decay heat being removed by the steam generators steaming to the condenser. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.08 h-0.045 days <br />-0.00643 weeks <br />-0.00148 months <br />) | |
| Opened: | Tim Riti 02:37 Apr 9, 2006 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Apr 9, 2006 |
| 42484 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 42484\u003C/a\u003E - \u003Ca href=\"/Calvert_Cliffs\" title=\"Calvert Cliffs\"\u003ECalvert Cliffs\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EControl Element Assembly Stuck During Physics Testing\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 42484 - Calvert Cliffs\n","link":"","lat":38.434263888888886,"lon":-76.44219722222222,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Startup (1 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 543252019-10-11T17:00:00011 October 2019 17:00:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Initiated ENS 503072014-07-25T03:15:00025 July 2014 03:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Shutdown Due to Reactor Coolant System Pressure Boundary Leakage ENS 493232013-09-05T17:14:0005 September 2013 17:14:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Failure to Align Control Element Assembly During Testing ENS 487632013-02-17T18:45:00017 February 2013 18:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressure Boundary Leakage Discovered During Containment Walkdown ENS 481832012-08-12T16:34:00012 August 2012 16:34:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Fully Inserted Control Rod While Operating ENS 481242012-07-21T16:10:00021 July 2012 16:10:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Shutdown Due to Rcs Pressure Boundary Instrument Line Leakage ENS 481162012-07-17T04:00:00017 July 2012 04:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Shutdown Due to Small Rcs Pressure Boundary Instrument Line Leak ENS 473162011-10-03T14:35:0003 October 2011 14:35:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification (Ts) Required Shutdown Due to Both 'A' Train Edg'S Inoperable ENS 424842006-04-09T03:42:0009 April 2006 03:42:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Control Element Assembly Stuck During Physics Testing 2019-10-11T17:00:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_42484&oldid=91757"