ENS 44086: Difference between revisions

v t e ENS Event
20:25 Mar 21, 2008
Title	Automatic Reactor Scram from a Main Turbine Trip
Event Description	Actuation of an RPS signal while the reactor was critical. At 1525 a generator trip signal on the main transformers initiated a reactor scram due to Turbine Stop and Control Valve fast closure. Safety relief valves operated initially to lower reactor pressure. Turbine bypass valves operated initially to lower reactor pressure. Turbine bypass valves are maintaining pressure control currently. Reactor recirc pumps A and B transferred to slow speed operation as expected. No ECCS initiations were received. Reactor level is being controlled with normal systems condensate and feedwater. Lowest level indicated was approximately -6" wide range. Level 3 initiations occurred to group 3 isolation valves. No valves operated, they are normally closed. The site is investigating the cause of the trip. A probable cause is the "C" phase differential trip which was received from the main transformer. All control rods fully inserted during the scram. The plant is on its normal shutdown electrical lineup. The licensee notified the NRC Resident Inspector.

ENS 44086 +/-
Where
Grand Gulf Mississippi (NRC Region 4)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.43 h-0.101 days <br />-0.0145 weeks <br />-0.00333 months <br />)
Opened:	Ernest Mathes 17:59 Mar 21, 2008
NRC Officer:	Mark Abramovitz
Last Updated:	Mar 21, 2008
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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 = 03/21/2008 15:25 CDT
 | last update date = 03/21/2008
-| title = Automatic Reactor Scram From A Main Turbine Trip
+| title = Automatic Reactor Scram from a Main Turbine Trip
 | event text = Actuation of an RPS signal while the reactor was critical.
 At 1525 a generator trip signal on the main transformers initiated a reactor scram due to Turbine Stop and Control Valve fast closure.  Safety relief valves operated initially to lower reactor pressure.  Turbine bypass valves operated initially to lower reactor pressure.  Turbine bypass valves are maintaining pressure control currently.  Reactor recirc pumps A and B transferred to slow speed operation as expected.  No ECCS initiations were received.  Reactor level is being controlled with normal systems condensate and feedwater.  Lowest level indicated was approximately -6" wide range.  Level 3 initiations occurred to group 3 isolation valves.  No valves operated, they are normally closed.

Latest revision as of 22:14, 1 March 2018