ENS 40358: Difference between revisions

v t e ENS Event
11:29 Nov 27, 2003
Title	Plant Had a Manual Reactor Trip from 23% Power Due to Turbine Vibration
Event Description	While rolling the turbine when at 20% power they experienced an over speed turbine trip. During a second attempt when at 23% power, the turbine had high vibration so they manually tripped the reactor. Cause for the vibration is being investigated since a new rotor had just been installed in the turbine. All rods fully inserted during the reactor trip and no ECCS injection occurred or primary relief valves lifted. The licensee notified the NRC Resident, the State of Connecticut and Local agencies * * UPDATE AT 1423 EST ON 11/28/03 FROM FRANKS TO GOTT * * * The following clarifying information was provided by the licensee. While at 23% power of a scheduled power ascension following a refueling outage, Millstone Unit 2 performed a required manual reactor trip when main turbine vibration reached a trip set point of 12 MILS. The main turbine vibrations were anticipated during the power ascension due to a newly installed low pressure "Mono-Block" rotor. All control rods fully inserted during the reactor trip and no ECCS injection occurred or primary relief valves lifted. The overspeed trip discussed in the original report was a test conducted prior to placing the main turbine on the grid. Notified R1DO (Dimitriadis). The licensee will notify the NRC Residence Inspector.

ENS 40358 +/-
Where
Millstone Connecticut (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-4.63 h-0.193 days <br />-0.0276 weeks <br />-0.00634 months <br />)
Opened:	Bruce Ferguson 06:51 Nov 27, 2003
NRC Officer:	Chauncey Gould
Last Updated:	Nov 28, 2003
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v • d • e

v t e Emergency Notification System
Millstone with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2023-05-30T08:46:00 [Table view]
[ENS list for Millstone]

@@ Line 16: / Line 16: @@
 | event date = 11/27/2003 06:29 EST
 | last update date = 11/28/2003
-| title = Plant Had A Manual Reactor Trip From 23% Power Due To Turbine Vibration
+| title = Plant Had a Manual Reactor Trip from 23% Power Due to Turbine Vibration
 | event text = While rolling the turbine when at 20% power they experienced an over speed turbine trip.  During a second attempt when at 23% power, the turbine had high vibration so they manually tripped the reactor.  Cause for the vibration is being investigated since a new rotor had just been installed in the turbine.  All rods fully inserted during the reactor trip and no ECCS injection occurred or primary relief valves lifted.
 The licensee notified the NRC Resident, the State of Connecticut and Local agencies

Latest revision as of 21:24, 1 March 2018