ENS 41655: Difference between revisions

v t e ENS Event
15:09 May 1, 2005
Title	Manual Reactor Trip Due to Main Turbine High Vibration
Event Description	Seabrook Station initiated a Manual Reactor Trip during initial start of the main turbine following a refueling outage. Turbine vibrations elevated to the automatic trip setpoint during initial increase to normal operating speed. The reactor was manually tripped to allow breaking main condenser vacuum and reduce main turbine speed. The plant is currently stable in Mode 3. All control rods [fully] inserted and decay heat removal is via the main condenser steam dumps. Emergency feedwater (EFW) pump actuation occurred because of lowering steam generator level due to the reactor trip. Steam generator level control was maintained using EFW. Condenser vacuum was broken until the turbine vibration alarms cleared and was then restored, allowing the condenser to be used for dumping steam. The licensee notified the NRC Resident Inspector.

ENS 41655 +/-
Where
Seabrook New Hampshire (NRC Region 1)
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:+-2.2 h-0.0917 days <br />-0.0131 weeks <br />-0.00301 months <br />)
Opened:	Damon Ritter 12:57 May 1, 2005
NRC Officer:	John Knoke
Last Updated:	May 1, 2005
41655 - 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 41655\u003C/a\u003E - \u003Ca href=\"/Seabrook\" title=\"Seabrook\"\u003ESeabrook\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EManual Reactor Trip Due to Main Turbine High Vibration\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41655 - Seabrook\n","link":"","lat":42.89886111111111,"lon":-70.85284722222222,"icon":"/w/images/9/9b/NextEra_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Seabrook with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2023-07-30T19:26:00 [Table view]
[ENS list for Seabrook]

@@ Line 16: / Line 16: @@
 | event date = 05/01/2005 11:09 EDT
 | last update date = 05/01/2005
-| title = Manual Reactor Trip Due To Main Turbine High Vibration
+| title = Manual Reactor Trip Due to Main Turbine High Vibration
 | event text =  Seabrook Station initiated a Manual Reactor Trip during initial start of the main turbine following a refueling outage.  Turbine vibrations elevated to the automatic trip setpoint during initial increase to normal operating speed.  The reactor was manually tripped to allow breaking main condenser vacuum and reduce main turbine speed.
 The plant is currently stable in Mode 3.   All control rods [fully] inserted and decay heat removal is via the main condenser steam dumps.

Latest revision as of 22:21, 1 March 2018