ENS 43899: Difference between revisions

Latest revision as of 22:15, 1 March 2018

v t e ENS Event
22:26 Jan 12, 2008
Title	Manual Reactor Scram Due to Degraded Cooling to Main Transformers
Event Description	On 1/12/08 at 1626 hours0.0188 days <br />0.452 hours <br />0.00269 weeks <br />6.18693e-4 months <br /> a manual scram was inserted due to degraded cooling on the main transformers. All control rods fully inserted and all systems actuated and/or operated as designed. No safety relief valves opened during the event and reactor pressure is currently being controlled within normal bands with bypass valves. Reactor water level is also being controlled within normal bands with the condensate and feedwater system. Group 2 and 3 isolation signals were received however, no valve movement occurred since these valves are normally closed." The licensee is investigating a potential electrical fault which may have caused the event, but it appears that there was an electrical fault in the transformer cooling system. The grid is normal with no transmission system warnings in effect. All feeds are available. Reactor vessel level is 32.6 inches stable with normal condensate system feeding the vessel. Primary plant pressure is 815 psig. All safety and BOP electrical buses are energized normally. No bus power was lost. Decay heat path is via bypass valves to the main condenser. The licensee will notify the NRC Resident Inspector.

ENS 43899 +/-
Where
Grand Gulf Mississippi (NRC Region 4)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-1.48 h-0.0617 days <br />-0.00881 weeks <br />-0.00203 months <br />)
Opened:	Frank Weaver 20:57 Jan 12, 2008
NRC Officer:	Joe O'Hara
Last Updated:	Jan 12, 2008
43899 - 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 43899\u003C/a\u003E - \u003Ca href=\"/Grand_Gulf\" title=\"Grand Gulf\"\u003EGrand Gulf\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EManual Reactor Scram Due to Degraded Cooling to Main Transformers\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 43899 - Grand Gulf\n","link":"","lat":32.009233333333334,"lon":-91.04695833333334,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Grand Gulf with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-03-26T16:15:00 [Table view]
[ENS list for Grand Gulf]

@@ Line 16: / Line 16: @@
 | event date = 01/12/2008 16:26 CST
 | last update date = 01/12/2008
-| title = Manual Reactor Scram Due To Degraded Cooling To Main Transformers
+| title = Manual Reactor Scram Due to Degraded Cooling to Main Transformers
 | event text = On 1/12/08 at 1626 hours a manual scram was inserted due to degraded cooling on the main transformers.  All control rods fully inserted and all systems actuated and/or operated as designed.  No safety relief valves opened during the event and reactor pressure is currently being controlled within normal bands with bypass valves.  Reactor water level is also being controlled within normal bands with the condensate and feedwater system.  Group 2 and 3 isolation signals were received however, no valve movement occurred since these valves are normally closed."
 The licensee is investigating a potential electrical fault which may have caused the event, but it appears that there was an electrical fault in the transformer cooling system.  The grid is normal with no transmission system warnings in effect.  All feeds are available.  Reactor vessel level is 32.6 inches stable with normal condensate system feeding the vessel. Primary plant pressure is 815 psig.  All safety and BOP electrical buses are energized normally.  No bus power was lost.  Decay heat path is via bypass valves to the main condenser.

Latest revision as of 22:15, 1 March 2018