ENS 47847: Difference between revisions

v t e ENS Event
20:11 Apr 18, 2012
Title	Unit Two Automatic Reactor Scram on High Reactor Pressure
Event Description	On April 18, 2012, at 1511 hours0.0175 days <br />0.42 hours <br />0.0025 weeks <br />5.749355e-4 months <br /> (CDT), an automatic scram occurred on high reactor pressure. The pressure increase occurred during post-modification testing on the main generator automatic voltage regulator, which had been upgraded during the recent refueling outage. Following the reactor scram, reactor water level decreased to approximately zero inches, which resulted in automatic Group II and III isolations (Reactor Water Clean Up and Secondary Containment Isolation) as expected. All systems responded properly to the event. The cause of the event is still under investigation. Unit 1 was unaffected by the event and remains at 100% power. This report is being made in accordance with 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv)(A). All Control Rods fully inserted, decay heat is being removed through the bypass steam valves to the main condenser, and the plant remains in a normal shutdown electrical alignment. The high reactor pressure appears to have been caused by a load rejection associated with the main generator voltage regulator testing. The licensee has informed the NRC Resident Inspector.

ENS 47847 +/-
Where
Quad Cities Illinois (NRC Region 3)
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:+-2.07 h-0.0863 days <br />-0.0123 weeks <br />-0.00284 months <br />)
Opened:	James Cox 18:07 Apr 18, 2012
NRC Officer:	John Shoemaker
Last Updated:	Apr 18, 2012
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v • d • e

v t e Emergency Notification System
Quad Cities with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-05-23T16:46:00 [Table view]
[ENS list for Quad Cities]

@@ Line 16: / Line 16: @@
 | event date = 04/18/2012 15:11 CDT
 | last update date = 04/18/2012
-| title = Unit Two Automatic Reactor Scram On High Reactor Pressure
+| title = Unit Two Automatic Reactor Scram on High Reactor Pressure
 | event text = On April 18, 2012, at 1511 hours (CDT), an automatic scram occurred on high reactor pressure.  The pressure increase occurred during post-modification testing on the main generator automatic voltage regulator, which had been upgraded during the recent refueling outage.
 Following the reactor scram, reactor water level decreased to approximately zero inches, which resulted in automatic Group II and III isolations (Reactor Water Clean Up and Secondary Containment Isolation) as expected.  All systems responded properly to the event.  The cause of the event is still under investigation.

Latest revision as of 21:04, 1 March 2018