ENS 49066
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
08:34 May 24, 2013 | |
| Title | Automatic Start of Emergency Diesel Generator Due to Bus Undervoltage |
| Event Description | At 0334 (CDT) on 5/24/2013 MNGP [Monticello Nuclear Generating Plant] experienced a loss of power to Bus 15 (Division 1 4kV Essential Bus) during performance of preoperational testing on the 2R reserve transformer which initiated an Essential Bus Transfer of Bus 15 and automatic start of 12 Emergency Diesel Generator.
MNGP was in Mode 5 operations with water level >21 feet 11 inches above the top of the RPV flange and all credited safety systems were lined up to Bus 16 (Division 2 4kV Essential Bus) which was unaffected by this event. Bus 15 was automatically repowered from the 1AR reserve transformer as designed. During this evolution all critical safety functions remained green and all systems responded as expected to the Essential Bus transfer. The cause of the sequence of events that led to the Bus 15 loss of power is being investigated. This event is reportable under 10CFR50.72(b)(3)(iv) as an event that results in a valid actuation of 12 Emergency Diesel Generator. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Monticello  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+2.82 h0.118 days <br />0.0168 weeks <br />0.00386 months <br />) | |
| Opened: | Martin Rajkowski 11:23 May 24, 2013 |
| NRC Officer: | Donald Norwood |
| Last Updated: | May 24, 2013 |
| 49066 - 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 49066\u003C/a\u003E - \u003Ca href=\"/Monticello\" title=\"Monticello\"\u003EMonticello\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EAutomatic Start of Emergency Diesel Generator Due to Bus Undervoltage\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 49066 - Monticello\n","link":"","lat":45.333647222222226,"lon":-93.8490361111111,"icon":"/w/images/6/6c/Xcel_Energy_icon.png"}],"imageoverlays":null} | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_49066&oldid=423083"