ENS 51931
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ENS Event | |
|---|---|
16:18 May 15, 2016 | |
| Title | Unusual Event Declared Due To Excessive Unidentified Leakage During Plant Startup |
| Event Description | Unit 2 experienced RCS Leakage, potentially pressure boundary leakage, or Unidentified Leakage greater than 10 gpm for [greater than] 15 minutes. Reactor Vessel Flange Temperature High Leakoff alarm was received. This met threshold for declaration of an Unusual Event at 1118 CDT per MU6. Unit 2 is currently in MODE 3. Investigation is in progress to identify specific leakage location.
The plant is stable, leakage indicates about 32 gpm and the startup has been stopped. There is no impact on Unit 1. The licensee notified the NRC Resident Inspector and State authorities. Notified DHS SWO, FEMA Ops Center, DHS NICC,. Notified FEMA National Watch and Nuclear SSA via email.
At 1459 CDT, the conditions under MU6 are no longer met. The site has terminated the Unusual Event. In addition, a press release will be made of this event. Unit 2 is stable and in Mode 3 pending further evaluation. The leak stopped when a loop drain isolation valve was closed. The licensee notified the NRC Resident Inspector and State and local authorities. Notified the R3DO (Duncan), NRR EO (Morris), IRD MOC (Grant), DHS SWO, FEMA Ops Center, and DHS NICC. Notified the FEMA National Watch and Nuclear SSA via email. |
| Where | |
|---|---|
Byron  Illinois (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.73 h-0.155 days <br />-0.0222 weeks <br />-0.00511 months <br />) | |
| Opened: | Ricardo Rosas 12:34 May 15, 2016 |
| NRC Officer: | Vince Klco |
| Last Updated: | May 15, 2016 |
| 51931 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
Byron with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 519312016-05-15T16:18:00015 May 2016 16:18:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Excessive Unidentified Leakage During Plant Startup ENS 516332016-01-03T05:40:0003 January 2016 05:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertant Siren Actuation ENS 491372013-06-20T11:00:00020 June 2013 11:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Sulfuric Acid Spill Requiring Offsite Notification ENS 482782012-09-05T17:25:0005 September 2012 17:25:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Sodium Hypochlorite Spill ENS 477082012-02-28T23:31:00028 February 2012 23:31:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Due to Loss of Offsite Power ENS 476242012-01-30T16:01:00030 January 2012 16:01:00 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, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Due to Loss of Offsite Power Greater than 15 Minutes ENS 444432008-08-28T11:15:00028 August 2008 11:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Small Oil Spill Into Intake Bay ENS 440942008-03-25T23:49:00025 March 2008 23:49:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Loss of Offsite Power Due to Station Auxiliary Transformer Fault ENS 438072007-11-27T15:15:00027 November 2007 15:15:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Oxygen Deficient Atmosphere ENS 423742006-02-24T14:54:00024 February 2006 14:54:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Fire in the Protected Area Not Extinguished within 15 Minutes ENS 422122005-12-20T23:12:00020 December 2005 23:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Press Release 2016-05-15T16:18:00 | |
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