ENS 46337: Difference between revisions

v t e ENS Event
09:12 Oct 17, 2010
Title	Automatic Reactor Trip Due to 4 Kv Group Bus Undervoltage Condition
Event Description	On 10/17/10 at 0512 [EDT], Unit 2 experienced an [automatic] reactor trip due to 4 kV group bus under voltage. While restoring the voltage regulator to automatic, following a swap to manual at 0123 [EDT] on 10/17/10 while 500 kV line 5014 was being restored to service, the reactor tripped after placing the voltage regulator in automatic. The crew entered EOP [Emergency Operating Procedure] Trip 1, and then EOP Trip 2 as required. The plant was stabilized at no load conditions. All rods fully inserted on the trip, and all systems responded as designed with RCS [Reactor Coolant System] temperature being controlled via 21 RCP [Reactor Coolant Pump] and the steam dump system. 22, 23, and 24 RCP's tripped on group bus under voltage. The AFW [Auxiliary Feed Water] Pumps started in response to low steam generator levels. 23 AFW was subsequently tripped per procedure since 21 and 22 AFW pumps were in service feeding 21-24 steam generators. Salem Unit 2 is currently in Mode 3. RCS temperature is 547 degrees. RCS pressure is 2235 pounds. All Emergency Core Cooling Systems and Engineered Safety Function Systems are available. No personnel injuries occurred as a result of the trip. No radiological release is in progress due to this event. At 0123 EDT, following the restoration of a 500 kV line, perturbation in the line caused an over current condition which shifted the voltage regulator to manual. After engineering's recommendation, the voltage regulator was placed in automatic shortly prior to the reactor trip. The plant is in a normal shutdown electrical lineup. There was no impact on Salem Unit 1 as a result of this event. The licensee has notified the NRC Resident Inspector. * * UPDATE FROM BILL MUFFLEY TO JOHN SHOEMAKER 1138 EDT ON 10/18/10 * * * Notified by the licensee that the AFW Pumps started on loss of Steam Generator Feed Pumps which had tripped on low suction pressure. The licensee has notified the NRC Resident Inspector.

ENS 46337 +/-
Where
Salem New Jersey (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:+-2.57 h-0.107 days <br />-0.0153 weeks <br />-0.00352 months <br />)
Opened:	Jack Osborne 06:38 Oct 17, 2010
NRC Officer:	Dong Park
Last Updated:	Oct 18, 2010
46337 - 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 46337\u003C/a\u003E - \u003Ca href=\"/Salem\" title=\"Salem\"\u003ESalem\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EAutomatic Reactor Trip Due to 4 Kv Group Bus Undervoltage Condition\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 46337 - Salem\n","link":"","lat":39.46302222222222,"lon":-75.53561388888889,"icon":"/w/images/c/cc/PSEG_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Salem with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2022-12-24T07:22:00 [Table view]
[ENS list for Salem]

@@ Line 16: / Line 16: @@
 | event date = 10/17/2010 05:12 EDT
 | last update date = 10/18/2010
-| title = Automatic Reactor Trip Due To 4 Kv Group Bus Undervoltage Condition
+| title = Automatic Reactor Trip Due to 4 Kv Group Bus Undervoltage Condition
 | event text = On 10/17/10 at 0512 [EDT], Unit 2 experienced an [automatic] reactor trip due to 4 kV group bus under voltage. While restoring the voltage regulator to automatic, following a swap to manual at 0123 [EDT] on 10/17/10 while 500 kV line 5014 was being restored to service, the reactor tripped after placing the voltage regulator in automatic.
 The crew entered EOP [Emergency Operating Procedure] Trip 1, and then EOP Trip 2 as required.  The plant was stabilized at no load conditions.  All rods fully inserted on the trip, and all systems responded as designed with RCS [Reactor Coolant System] temperature being controlled via 21 RCP [Reactor Coolant Pump] and the steam dump system.  22, 23, and 24 RCP's tripped on group bus under voltage.  The AFW [Auxiliary Feed Water] Pumps started in response to low steam generator levels.  23 AFW was subsequently tripped per procedure since 21 and 22 AFW pumps were in service feeding 21-24 steam generators.

v t e Unit 2
W-4-LP
Reactor critical	Critical
Scram	A/R
Before	Power Operation (100 %)
After	Hot Standby (0 %)

ENS 46337: Difference between revisions

Latest revision as of 22:08, 1 March 2018

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ENS 46337: Difference between revisions

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