ENS 50872: Difference between revisions

v t e ENS Event
03:40 Mar 8, 2015
Title	Specified System Actuation Due to Loss of One Reserve Station Service Offsite Power Source
Event Description	On March 7, 2015, at 2140 CST, with the plant in Mode 5, Refueling, the RSS#2, one of two Reserve Station Service offsite power sources, de-energized. This loss of RSS#2 caused the de-energization of the Division 2 Safety Bus, which caused a valid start signal to the logic of the Division 2 Emergency Diesel Generator. No start occurred, however, due to the diesel being in the maintenance mode. Division 2 Standby Service Water, which was being run for system fill and vent as well as surveillance testing, also lost power. At the time RSS#2 was lost, the Division 2 Diesel generator and Division 2 Standby Service Water were inoperable for the Refuel Outage 18 Division 2 maintenance window. Division 1 systems and RSS#1 were not affected by the power loss and continued to operate normally. There were 5 control building dampers and 1 floor drain air operated valve that repositioned due to the loss of power. The cause of RSS#2 de-energization is still under investigation. The licensee notified the NRC Resident Inspector.

ENS 50872 +/-
Where
River Bend Louisiana (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+1.68 h0.07 days <br />0.01 weeks <br />0.0023 months <br />)
Opened:	Danny James 05:21 Mar 8, 2015
NRC Officer:	Donald Norwood
Last Updated:	Mar 8, 2015
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v • d • e

v t e Emergency Notification System
River Bend with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2023-12-13T07:02:00 [Table view]
[ENS list for River Bend]

@@ Line 16: / Line 16: @@
 | event date = 03/07/2015 21:40 CST
 | last update date = 03/08/2015
-| title = Specified System Actuation Due To Loss Of One Reserve Station Service Offsite Power Source
+| title = Specified System Actuation Due to Loss of One Reserve Station Service Offsite Power Source
 | event text = On March 7, 2015, at 2140 CST, with the plant in Mode 5, Refueling, the RSS#2, one of two Reserve Station Service offsite power sources, de-energized.  This loss of RSS#2 caused the de-energization of the Division 2 Safety Bus, which caused a valid start signal to the logic of the Division 2 Emergency Diesel Generator.  No start occurred, however, due to the diesel being in the maintenance mode.  Division 2 Standby Service Water, which was being run for system fill and vent as well as surveillance testing, also lost power.
 At the time RSS#2 was lost, the Division 2 Diesel generator and Division 2 Standby Service Water were inoperable for the Refuel Outage 18 Division 2 maintenance window.

Latest revision as of 21:48, 1 March 2018