ENS 51845: Difference between revisions

Latest revision as of 20:45, 1 March 2018

v t e ENS Event
17:57 Apr 2, 2016
Title	Insulator Failure on Reserve Auxiliary Transformer
Event Description	At approximately 1257 [CDT] on 4/02/16, the Main Control Room received numerous annunciators that indicated a trip of the Reserve Auxiliary Transformer (RAT) Static VAR Compensator (SVC) that was caused by an insulator failure of the 'A' phase 345kV Circuit Switcher. As a result of the voltage transient, the Division 1 Fuel Building Ventilation (VF) system isolation dampers closed causing a trip of VF supply and exhaust fans. With no running VF fans, secondary containment differential pressure rose to slightly greater than 0 inches water gauge which exceeded the Technical Specification requirement of greater than 0.25 inches vacuum water gauge. The Control Room entered EOP-8, Secondary Containment Control. This event is being reported as a 'Condition that Could Have Prevented Fulfillment of a Safety Function' under 10CFR50.72(b)(3)(v)(C). Secondary Containment differential pressure was restored within Technical Specification requirements at 1300 [CDT] by starting the Standby Gas Treatment HVAC (VG) system. The NRC Resident Inspector has been notified.

ENS 51845 +/-
Where
Clinton 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:+0.5 h0.0208 days <br />0.00298 weeks <br />6.849e-4 months <br />)
Opened:	Justin Reynolds 18:27 Apr 2, 2016
NRC Officer:	Mark Abramovitz
Last Updated:	Apr 2, 2016
51845 - 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 51845\u003C/a\u003E - \u003Ca href=\"/Clinton\" title=\"Clinton\"\u003EClinton\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EInsulator Failure on Reserve Auxiliary Transformer\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 51845 - Clinton\n","link":"","lat":40.17286111111111,"lon":-88.8332,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2018-03-30T18:05:00 [Table view]
[ENS list for Clinton]

@@ Line 16: / Line 16: @@
 | event date = 04/02/2016 12:57 CDT
 | last update date = 04/02/2016
-| title = Insulator Failure On Reserve Auxiliary Transformer
+| title = Insulator Failure on Reserve Auxiliary Transformer
 | event text = At approximately 1257 [CDT] on 4/02/16, the Main Control Room received numerous annunciators that indicated a trip of the Reserve Auxiliary Transformer (RAT) Static VAR Compensator (SVC) that was caused by an insulator failure of the 'A' phase 345kV Circuit Switcher. As a result of the voltage transient, the Division 1 Fuel Building Ventilation (VF) system isolation dampers closed causing a trip of VF supply and exhaust fans. With no running VF fans, secondary containment differential pressure rose to slightly greater than 0 inches water gauge which exceeded the Technical Specification requirement of greater than 0.25 inches vacuum water gauge. The Control Room entered EOP-8, Secondary Containment Control. This event is being reported as a 'Condition that Could Have Prevented Fulfillment of a Safety Function' under 10CFR50.72(b)(3)(v)(C). Secondary Containment differential pressure was restored within Technical Specification requirements at 1300 [CDT] by starting the Standby Gas Treatment HVAC (VG) system.
 The NRC Resident Inspector has been notified.

Latest revision as of 20:45, 1 March 2018