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 Byron Nuke Station Declares then Terminates Unusual Event 
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BYRON (WIFR) -- Leaking water causes the Byron Generating Station to declare a "unusual event."

Exelon, which operates the station, says water leakage from the system that provides cooling water to the Unit 2 reactor exceeded procedural limits. Operators quickly identified the source valve and isolated the leakage.

Exelon says the excess water did not leave the systems piping and at no time was there any impact to workers or a threat to the public's health and safety.

The unit has been offline for a planned refueling outage since April 18th.


FULL ARTICLE HERE:
http://www.wifr.com/content/news/Byron-Generating-Station-Declares-thenTerminates-Unusual-Event-379587651.html

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Sun May 15, 2016 6:32 pm
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Here is a link to the NRC Event Report that explains what happened. It appears that unit #2 was leaking (when they attempted to start it up) over 35 gallons per minute and ran for 15 minutes or more before they shut it down.

Quote:
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.

* * * 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.


http://www.nrc.gov/reading-rm/doc-collections/event-status/event/en.html#en51931

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Mon May 16, 2016 10:29 am
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:!: If I read that NRC report above correctly, it appears that a drain loop valve was left open (likely during the fuel outage maintenance) and they failed to notice this before attempting to start-up reactor #2.

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Mon May 16, 2016 10:45 am
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Well, it's the end of the day and they are still apparently getting the wording right for the press release (maybe it will be released on Tuesday). I hope they confirm that the 500 gallons of water that accidentally went down the drain was not contaminated.

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Mon May 16, 2016 10:26 pm
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Whatever the amount of water is, it was contaminated with tritium at the very least. Tritium passes through pipes that the cooling water goes through, that is a hidden fact.

:?: The big question is how much water leaked in total from the system and where is that water now.

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Mon May 16, 2016 11:07 pm
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