ENS 45472: Difference between revisions

From kanterella

Latest revision as of 21:10, 1 March 2018

v t e ENS Event
12:12 Nov 2, 2009
Title	Loss of Shutdown Cooling
Event Description	On 11/2/09 at 0712 shutdown cooling (SDC) was lost on Dresden Unit 2 when a recirculation loop temperature element (2-0260-13B) failed upscale. Unit 2 was in the process of initial cooldown for entry into a refueling outage. Recirculation loop temperature was approximately 224 degrees F based on alternate indications. The circuitry was jumpered out and SDC was restarted at 0748. The Recirculation loop temperature was at 260 degrees F upon restart. At 0835, the reactor entered Mode 4 (i.e., Recirculation loop temperature less than or equal to 212 degrees F and Mode Switch in Shutdown). This event is reportable under 10CFR 50.72(b)(3)(v)(B). This event is being reported based on lessons learned from industry experience and is undergoing further review. The licensee notified NRC Resident Inspector.

ENS 45472 +/-
Where
Dresden Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
Time - Person (Reporting Time:+2.18 h0.0908 days <br />0.013 weeks <br />0.00299 months <br />)
Opened:	Chris Kent 14:23 Nov 2, 2009
NRC Officer:	Vince Klco
Last Updated:	Nov 2, 2009
45472 - 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 45472\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\u003ELoss of Shutdown Cooling\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 45472 - 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)(B), Loss of Safety Function - Remove Residual Heat
WEEKMONTHYEAR2025-07-30T21:45:00 [Table view]
[ENS list for Dresden]

@@ Line 16: / Line 16: @@
 | event date = 11/02/2009 07:12 CDT
 | last update date = 11/02/2009
-| title = Loss Of Shutdown Cooling
+| title = Loss of Shutdown Cooling
 | event text = On 11/2/09 at 0712 shutdown cooling (SDC) was lost on Dresden Unit 2 when a recirculation loop temperature element (2-0260-13B) failed upscale. Unit 2 was in the process of initial cooldown for entry into a refueling outage. Recirculation loop temperature was approximately 224 degrees F based on alternate indications. The circuitry was jumpered out and SDC was restarted at 0748. The Recirculation loop temperature was at 260 degrees F upon restart. At 0835, the reactor entered Mode 4 (i.e., Recirculation loop temperature less than or equal to 212 degrees F and Mode Switch in Shutdown). This event is reportable under 10CFR 50.72(b)(3)(v)(B). This event is being reported based on lessons learned from industry experience and is undergoing further review.
 The licensee notified NRC Resident Inspector.