[Date Prev][Date Next][Date Index]

E-M:/ Cook - Reactor Trip / Turbine Vibrations



http://www.nrc.gov/reading-rm/doc-collections/event-status/event/en.html

Current Event Notification Report for February 4, 2008

U.S. Nuclear Regulatory Commission Operations Center

Event Reports For 02/01/2008 - 02/04/2008

Power Reactor Event Number: 43956 [scroll to listed event]
Facility: COOK
Region: 3 State: MI
Unit: [1]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: RICH KRESS
HQ OPS Officer: JASON KOZAL Notification Date: 02/02/2008
Notification Time: 07:44 [ET]
Event Date: 02/02/2008
Event Time: 05:30 [EST]
Last Update Date: 02/02/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
CHRISTINE LIPA (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 M/R Y 93 Power Operation 0 Hot Standby

Event Text
MANUAL REACTOR TRIP DUE TO HIGH TURBINE VIBRATIONS

"The DC Cook Unit 1 Reactor was manually tripped from 93% power due to high vibrations on main turbine bearings #5 and 6.

"This event is reportable under 10CFR50.72(b)(2)(iv)(B), RPS actuation, as a four (4) hour report and under 10CFR50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report.

"Preliminary evaluation indicates all plant systems functioned normally following the Reactor Trip. DC Cook Unit 1 remains stable in Mode 3 while conducting the post Trip Review. No radioactive release is in progress as a result of this event.

"The DC Cook Resident NRC Inspector was notified 02/02/08 at approximately 0535 EST.

"The electrical grid is stable and Unit 1 is being supplied by offsite power. Unit 2 is not affected. All control rods fully inserted. Decay heat is being removed via steam dumps to the main condenser."



Privacy Policy | Site Disclaimer
Monday, February 04, 2008