ENS 49575: Difference between revisions

v t e ENS Event
05:01 Nov 24, 2013
Title	Momentary Loss of Reactor Building Ventilation
Event Description	On 11/24/2013 at 00:00:54 seconds [EST], Reactor Building ventilation tripped due to low outside air temperature. At 00:01:42 seconds, Secondary Containment Differential pressure went positive, with a maximum of +0.08 inches WC [water column]. This is a loss of Secondary Containment function. At 00:02:30 seconds, Standby Gas Treatment System was started and Secondary Containment pressure then decreased to <0 inches WC at 00:03:18 seconds. All the above data parameters were taken from the Division 2 Reactor Building Differential pressure recorder. Secondary Containment pressure is stable with differential pressure negative <-0.30 inches WC. The loss of Secondary Containment function is reportable under 10CFR 50.72(b)(3)(v)(c) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material. Technical Specification requirement are to maintain secondary containment pressure <-0.125 WC. No actual radiation release occurred during the event. The licensee notified the NRC Resident Inspector.

ENS 49575 +/-
Where
Fermi Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Time - Person (Reporting Time:+-2.12 h-0.0883 days <br />-0.0126 weeks <br />-0.0029 months <br />)
Opened:	Mark Eghigian 02:54 Nov 24, 2013
NRC Officer:	Mark Abramovitz
Last Updated:	Nov 24, 2013
49575 - 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 49575\u003C/a\u003E - \u003Ca href=\"/Fermi\" title=\"Fermi\"\u003EFermi\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EMomentary Loss of Reactor Building Ventilation\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 49575 - Fermi\n","link":"","lat":41.96295277777778,"lon":-83.25779444444444,"icon":"/w/images/5/5b/DTE_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Fermi with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2021-10-14T17:20:00 [Table view]
[ENS list for Fermi]

@@ Line 16: / Line 16: @@
 | event date = 11/24/2013 00:01 EST
 | last update date = 11/24/2013
-| title = Momentary Loss Of Reactor Building Ventilation
+| title = Momentary Loss of Reactor Building Ventilation
 | event text = On 11/24/2013 at 00:00:54 seconds [EST], Reactor Building ventilation tripped due to low outside air temperature.  At 00:01:42 seconds, Secondary Containment Differential pressure went positive, with a maximum of +0.08 inches WC [water column].  This is a loss of Secondary Containment function.   At 00:02:30 seconds, Standby Gas Treatment System was started and Secondary Containment pressure then decreased to <0 inches WC at 00:03:18 seconds.  All the above data parameters were taken from the Division 2 Reactor Building Differential pressure recorder.
 Secondary Containment pressure is stable with differential pressure negative <-0.30 inches WC.

Latest revision as of 21:52, 1 March 2018