ENS 45753: Difference between revisions

v t e ENS Event
22:35 Mar 8, 2010
Title	Automatic Reactor Scram on Low Reactor Water Level
Event Description	An 'A' reactor feed pump trip occurred and initiated a recirculation pump flow control valve runback. During the flow control valve runback, the 'A' recirculation hydraulic power unit tripped causing an incomplete runback. Reactor water level 3 (11.4 inches) was reached which is an RPS scram setpoint and also a setpoint for Group 2 (RHR to Radwaste) and Group 3 (Shutdown Cooling Isolation). No valves isolated in these systems due to [the valves] being in their normally closed position. The lowest reactor water level reached was -28 inches wide range. Appropriate off normal event procedures were entered to mitigate the transient with all systems responding as designed. No loss of offsite or ESF power occurred. No ECCS initiation signals were reached, and no ECCS or Diesel Generator initiation occurred. All safety systems performed as expected. MSIVs remained open and no SRVs lifted. Main condenser and pressure control systems remained in service. Currently, reactor water level is being maintained by the condensate and feedwater system in the normal level band and reactor pressure is being controlled to limit cooldown. During the scram, all rods inserted into the core. The plant is in its normal shutdown electrical lineup. Decay heat removal is via the steam bypass valves to the condenser. The licensee has notified the NRC Resident Inspector.

ENS 45753 +/-
Where
Grand Gulf Mississippi (NRC Region 4)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.8 h-0.117 days <br />-0.0167 weeks <br />-0.00384 months <br />)
Opened:	Terry Holcombe 19:47 Mar 8, 2010
NRC Officer:	Howie Crouch
Last Updated:	Mar 8, 2010
45753 - 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 45753\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\u003EAutomatic Reactor Scram on Low Reactor Water Level\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 45753 - 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
WEEKMONTHYEAR2023-12-16T09:50:00 [Table view]
[ENS list for Grand Gulf]

@@ Line 16: / Line 16: @@
 | event date = 03/08/2010 16:35 CST
 | last update date = 03/08/2010
-| title = Automatic Reactor Scram On Low Reactor Water Level
+| title = Automatic Reactor Scram on Low Reactor Water Level
 | event text = An 'A' reactor feed pump trip occurred and initiated a recirculation pump flow control valve runback.  During the flow control valve runback, the 'A' recirculation hydraulic power unit tripped causing an incomplete runback.
 Reactor water level 3 (11.4 inches) was reached which is an RPS scram setpoint and also a setpoint for Group 2 (RHR to Radwaste) and Group 3 (Shutdown Cooling Isolation).  No valves isolated in these systems due to [the valves] being in their normally closed position. The lowest reactor water level reached was -28 inches wide range.

Latest revision as of 22:10, 1 March 2018