ENS 43581: Difference between revisions

From kanterella

Latest revision as of 21:16, 1 March 2018

v t e ENS Event
15:53 Aug 20, 2007
Title	Electrical Breaker B4305 Unable to Function
Event Description	During panel walk downs in the Main Control Room, an Operator discovered no light indication for V-AC-4, B RHR ROOM AIR COOLING UNIT. Operator was dispatched to Breaker B4305 and 'B' RHR room to determine cause of loss of indicating light. The Operator determined that breaker B4305 (V-AC-4, 'B' RHR ROOM AIR COOLING UNIT 480V SUPPLY) was unable to function. Division II RHR pumps, Division II CS pump, and associated low pressure injection systems were declared inoperable. Tech Spec Actions 3.5.1.A, 3.5.1.B, and 3.5.1.M were entered resulting in entry into LCO 3.0.3 at 1053 on August 20, 2007. At 1151 on August 20, 2007 power reduction was commenced using normal shutdown procedures. Site Electricians determined that a line fuse had blown. The fan motor was meggared and all three line fuses were replaced. At 1230 on August 20, 2007, V-AC-4 was tested and returned to service. Division II RHR pumps, Division II CS pump and associated low pressure injection systems were declared operable. LCO 3.0.3 and T.S. Actions 3.5.1.A, 3.5.1.B, and 3.5.1.M were exited. Power reduction was terminated at 98%. At the completion of the call the power level had returned to 100%. The licensee notified the NRC Resident Inspector.

ENS 43581 +/-
Where
Monticello Minnesota (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
Time - Person (Reporting Time:+-1.3 h-0.0542 days <br />-0.00774 weeks <br />-0.00178 months <br />)
Opened:	Randy Sandy 14:35 Aug 20, 2007
NRC Officer:	John Knoke
Last Updated:	Aug 20, 2007
43581 - 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 43581\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\u003EElectrical Breaker B4305 Unable to Function\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 43581 - Monticello\n","link":"","lat":45.333647222222226,"lon":-93.8490361111111,"icon":"/w/images/6/6c/Xcel_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Monticello with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2014-01-17T23:36:00 [Table view]
[ENS list for Monticello]

@@ Line 16: / Line 16: @@
 | event date = 08/20/2007 10:53 CDT
 | last update date = 08/20/2007
-| title = Electrical Breaker B4305 Unable To Function
+| title = Electrical Breaker B4305 Unable to Function
 | event text = During panel walk downs in the Main Control Room, an Operator discovered no light indication for V-AC-4, B RHR ROOM AIR COOLING UNIT.  Operator was dispatched to Breaker B4305 and 'B' RHR room to determine cause of loss of indicating light. The Operator determined that breaker B4305 (V-AC-4, 'B' RHR ROOM AIR COOLING UNIT 480V SUPPLY) was unable to function.  Division II RHR pumps, Division II CS pump, and associated low pressure injection systems were declared inoperable.  Tech Spec Actions 3.5.1.A, 3.5.1.B, and 3.5.1.M were entered resulting in entry into LCO 3.0.3 at 1053 on August 20, 2007.  At 1151 on August 20, 2007 power reduction was commenced using normal shutdown procedures.
 Site Electricians determined that a line fuse had blown.  The fan motor was meggared and all three line fuses were replaced.   At 1230 on August 20, 2007, V-AC-4 was tested and returned to service.  Division II RHR pumps, Division II CS pump and associated low pressure injection systems were declared operable.  LCO 3.0.3 and T.S. Actions 3.5.1.A, 3.5.1.B, and 3.5.1.M were exited.  Power reduction was terminated at 98%.