ENS 41207
ENS Event | |
|---|---|
22:30 Nov 18, 2004 | |
| Title | Both Trains of Radiation Monitoring Automatic Isolation Features Disabled During Refueling Operations |
| Event Description | The following information was obtained from the licensee via facsimile:
At 1630 [hrs CST] the control room was performing head lift and pre-rod drive unlatching checkout and discovered R-12 (Containment Radiation Monitor) would not isolate reactor ventilation isolation. Investigation found that work on Engineered Safeguards Features pre-startup logic test had defeated both Train A and B automatic isolation signals to [Reactor Building Ventilation]. This test was started and signals defeated at 0803 [hrs.] and 0804 [hrs.]. Refueling evolutions, upper internals lift and rod latching were performed. Technical Specifications require auto-isolation capability for [Reactor Building Ventilation] during refueling ops. Both R-12 and R-21 would respond to high radiation and manual isolation of Reactor Building Ventilation was still available. Currently, refueling operations are stopped until auto-isolation of Reactor Building Ventilation is restored. The licensee has determined that no increased gaseous or particulate radiation levels existed while the auto-isolation features were defeated. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Kewaunee  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+-3.52 h-0.147 days <br />-0.021 weeks <br />-0.00482 months <br />) | |
| Opened: | Dave Karst 18:59 Nov 18, 2004 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Nov 18, 2004 |
| 41207 - 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 41207\u003C/a\u003E - \u003Ca href=\"/Kewaunee\" title=\"Kewaunee\"\u003EKewaunee\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBoth Trains of Radiation Monitoring Automatic Isolation Features Disabled During Refueling Operations\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41207 - Kewaunee\n","link":"","lat":44.342975,"lon":-87.53713055555555,"icon":"/w/images/b/b0/Dominion_icon.png"}],"imageoverlays":null} | |