ENS 48689: Difference between revisions

v t e ENS Event
06:13 Jan 22, 2013
Title	Secondary Containment Pressure Positive for 12 Seconds
Event Description	On 01/22/2013 at 00:30 Reactor building HVAC tripped due to low outside air temperature and Standby Gas Treatment system was manually started and maintained Reactor Building differential pressure negative. At 01:13 secondary containment pressure went positive during restart of the Center Reactor Building HVAC Train. This is a loss of secondary containment function. In a 12 second time span secondary containment pressure went above 0 inches WC [Water Column] to +0.17 inches WC and then decreased to < 0 inches WC remaining stable during the Reactor Building HVAC restart. The Center Reactor Building HVAC Exhaust Fan Discharge Damper opened after the Supply Fan discharge damper; this condition would produce the indications noted. The System was returned to normal with two Reactor Building HVAC trains running and the Standby Gas Treatment System shutdown and in standby. Reactor building pressure is stable with differential pressure negative < - 0.30 inches WC. The loss of Secondary Containment function is reportable under 10 CFR 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. The licensee notified the NRC Resident Inspector.

ENS 48689 +/-
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:+2.42 h0.101 days <br />0.0144 weeks <br />0.00331 months <br />)
Opened:	Kelley Blenky 08:38 Jan 22, 2013
NRC Officer:	Pete Snyder
Last Updated:	Jan 22, 2013
48689 - 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 48689\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\u003ESecondary Containment Pressure Positive for 12 Seconds\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 48689 - 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 = 01/22/2013 01:13 EST
 | last update date = 01/22/2013
-| title = Secondary Containment Pressure Positive For 12 Seconds
+| title = Secondary Containment Pressure Positive for 12 Seconds
 | event text = On 01/22/2013 at 00:30 Reactor building HVAC tripped due to low outside air temperature and Standby Gas Treatment system was manually started and maintained Reactor Building differential pressure negative. At 01:13 secondary containment pressure went positive during restart of the Center Reactor Building HVAC Train. This is a loss of secondary containment function. In a 12 second time span secondary containment pressure went above 0 inches WC [Water Column] to +0.17 inches WC and then decreased to < 0 inches WC remaining stable during the Reactor Building HVAC restart. The Center Reactor Building HVAC Exhaust Fan Discharge Damper opened after the Supply Fan discharge damper; this condition would produce the indications noted.
 The System was returned to normal with two Reactor Building HVAC trains running and the Standby Gas Treatment System shutdown and in standby. Reactor building pressure is stable with differential pressure negative < - 0.30 inches WC.

Latest revision as of 21:01, 1 March 2018