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Tuesday, November 15, 2011

Xenon at Fukushima Daiichi No. 2 - Gone!

TEPCO has released its latest analysis of gases sampled from the primary containment of the Unit 2 plant... and Xenon (all isotopes tested for) is not present. Below is the TEPCO table showing this very latest data.

There have been no statements so far of which this author is aware to indicate that TEPCO will not sample Unit 1 and Unit 3 containments for xenon, but this developing trend makes any such action appear not only clearly less emergent but probably less important all the time.

5:25 PM Eastern Tuesday November 15, 2011

1 comment:

  1. Well, I'm puzzled now. I thought the continuing appearance of xenon after injecting boron was supposed to be a demonstration that the xenon was not due to neutron-induced fission?

    Ah - I see the detection limits on this set of results are way higher than previously. And I also see that now they have a "criticality" statement, showing that the new detection limit is still easily able to detect the level that would imply any rise in neutron-induced fission.

    So it's not that the xenon has really gone, but that they have realized that they don't need to look for the ultra-low levels because that won't tell them anything.

    They might or might not sample #1 and #3 gas, but unless the opportunity is there to assess ultra-low levels, I wouldn't think they would look any harder than this current process.