Skip to content

Nuclear Event – Unusual Event/Unidentified Leakage: Byron Nuclear Generating Station, Unit 2, Illinois

2016/05/17

North America – USA | State of Illinois, Ogle County, Rockvale Township, Byron Station,  Unit 2
Location: 42°04’27.0″N 89°16’55.0″W
Present Operational Age: ~31 years
Event: UNUSUAL EVENT,  EMERGENCY DECLARED

Nuclear Event in USA on Sunday, 15 May  2016 at 11:18 [CDT].

UNUSUAL EVENT DECLARED DUE TO EXCESSIVE UNIDENTIFIED LEAKAGE DURING PLANT STARTUP

“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.

* * * UPDATE FROM RICARDO ROSAS TO VINCE KLCO ON 5/15/16 AT 1626 EDT * * *

“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.

Source: NRC  Event Number: 51931
——————————————-

Advertisements
Leave a Comment

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s