ENS 47540

From kanterella

Jump to navigation Jump to search

v t e ENS Event
06:46 Dec 21, 2011
Title	Both Unit Two Secondary Containment Doors Were Inadvertently Left Open
Event Description	On 12/21/11 at 0046 Secondary Containment integrity was lost when both U2 Reactor Building interlock doors were open simultaneously. Interlock door electrical checks were in progress. TS LCORA 3.6.4.1.Condition A was entered. Reactor Building differential pressure remained within Tech Spec limits. The doors were both open for approximately 9 seconds. The cause of the event is being investigated. The NRC Resident Inspector has been notified. The State of Illinois Inspector will be notified. * * RETRACTION FROM KATHARINE NETEMEYER TO CHARLES TEAL ON 2/6/12 AT 1243 EST * * * On 12/21/2011, EN 47540 was made describing a condition where secondary containment was declared inoperable due to not meeting the surveillance requirement for having one access door closed. This was reported as a loss of safety function for the secondary containment. This condition occurred during a planned maintenance activity. During a maintenance activity both doors unexpectedly opened. As a part of the maintenance, the inner door was opened by maintenance personnel using the normal control pushbutton. Upon personnel observing the outer door opening, the inner door button was released and the functional door automatically closed. Although both doors were briefly open, the negative pressure required to ensure secondary containment integrity was maintained at all times. Based on the door immediately closing and negative pressure being maintained, this is not considered a loss of safety function. Therefore this EN is being retracted. The NRC Resident Inspector has been notified. Notified R3DO (Giessner).

ENS 47540 +/- *RETRACTED*
Where
Dresden Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Time - Person (Reporting Time:+-0.53 h-0.0221 days <br />-0.00315 weeks <br />-7.25994e-4 months <br />)
Opened:	Landon Brittain 06:14 Dec 21, 2011
NRC Officer:	Joe O'Hara
Last Updated:	Feb 6, 2012
47540 - 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 47540\u003C/a\u003E - \u003Ca href=\"/Dresden\" title=\"Dresden\"\u003EDresden\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBoth Unit Two Secondary Containment Doors Were Inadvertently Left Open\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 47540 - Dresden\n","link":"","lat":41.3886,"lon":-88.26909166666667,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Dresden with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2019-01-30T15:10:00 [Table view]
[ENS list for Dresden]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_47540&oldid=86865"