ENS 44152
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ENS Event | |
|---|---|
02:16 Apr 21, 2008 | |
| Title | Unit 1 Manual Reactor Trip Due to Main Turbine Vibrations |
| Event Description | While ramping the Unit 1 Turbine following a forced unit outage, vibrations on the number 4 bearing increased to 13.9 mils. The ramp was stopped and a rapid load reduction was initiated. Due to sustained vibrations (>14.1 mils) after ramping the turbine down, the Unit 1 reactor was manually tripped. Unit 1 has been stabilized at Hot Shutdown.
All three auxiliary feedwater pumps automatically initiated as designed on low-low steam generator level following the trip. Currently RCS temperature is being maintained stable at 547 degrees. All systems functioned as required following the reactor trip. There were no radiation releases due to this event, nor were there any personnel injuries or contamination events. This event is being reported in accordance with 10 CFR 50.72 (b)(2)(iv) and 10 CFR 50.72 (b)(3)(iv). Upon exiting the refueling outage in 11/07 the main turbine had a vibration issue of about 11 or 12 mils. Decay heat is being removed via the steam dumps to the condenser. Unit 2 was not affected during this event. Offsite power was lined up normally. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| 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:+-1.65 h-0.0688 days <br />-0.00982 weeks <br />-0.00226 months <br />) | |
| Opened: | Hunter Schill 00:37 Apr 21, 2008 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 21, 2008 |
| 44152 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (37 %) |
| After | Hot Shutdown (0 %) |
Surry with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 571582024-06-02T21:08:0002 June 2024 21:08:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip ENS 537362018-11-12T05:00:00012 November 2018 05:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation ENS 536622018-10-11T04:00:00011 October 2018 04:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Actuation of Emergency Diesel Generator Due to Transformer Trip ENS 531702018-01-17T14:52:00017 January 2018 14:52:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auto-Start of Emergency Diesel Generator Due to Transformer Fuses Being Disconnected ENS 522922016-10-09T06:54:0009 October 2016 06:54:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Following Main Generator Differential Lockout Turbine Trip ENS 514672015-10-13T22:15:00013 October 2015 22:15:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip After a Turbine Trip ENS 514022015-09-17T00:14:00017 September 2015 00:14:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Start and Loading of the #2 Emergency Diesel Generator ENS 512442015-07-21T09:04:00021 July 2015 09:04:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Surry Unit 2 Trip During Reactor Startup ENS 505292014-10-13T11:58:00013 October 2014 11:58:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to a Spurious Overpower / Delta Temperature Signal ENS 486382012-12-29T13:03:00029 December 2012 13:03:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Auto-Start and Load Upon Trip of Reserve Station Transformer ENS 469052011-05-30T12:08:00030 May 2011 12:08:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation - Afw Initiation ENS 467612011-04-16T22:55:00016 April 2011 22:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Loss of All Offsite Power from Tornado Damage ENS 465842011-02-02T10:33:0002 February 2011 10:33:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Loss of Rcs Coolant Flow in One Loop ENS 459862010-06-08T13:48:0008 June 2010 13:48:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Automatic Reactor Trip with Safety Injection Due to Loss of Vital Ac Bus ENS 455282009-11-29T15:45:00029 November 2009 15:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Trip from Intermediate Range Due to Rod Group Demand Counter Discrepancy ENS 442212008-05-17T13:04:00017 May 2008 13:04:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Failed Relay Causes Emergency Diesel Generator to Start ENS 441522008-04-21T02:16:00021 April 2008 02:16:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manual Reactor Trip Due to Main Turbine Vibrations ENS 413832005-02-08T01:23:0008 February 2005 01:23:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip During Startup Due to Indication of Misaligned Rod ENS 407692004-05-22T01:08:00022 May 2004 01:08:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Generator Leads Failure ENS 401682003-09-18T13:00:00018 September 2003 13:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Expected Severe Weather 2024-06-02T21:08:00 | |
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