See: http://lewis.armscontrolwonk.com/files/2011/03/Cause_of_the_high_Cl38_Radioactivity.pdf
QUOTE: WHAT WAS THE CAUSE OF THE HIGH Cl-38 RADIOACTIVITY IN THE FUKUSHIMA DAIICHI REACTOR #1 F. Dalnoki-Veress March 28 2011 I have been totally consumed the last few weeks by one thing, day and night, and those are the events unfolding in Japan. I keep on alternating between complete disbelief and acceptance of the gravity of the situation, but mostly disbelief. And I am not the only one. Most of the nuclear physicists and engineers with whom I have spoken since the incident cannot - will not - believe that it is possible that some of the fuel that is melting could somehow produce little pockets that could go critical. I believed them for the longest time until the following came on the Kyodo news website (relevant text italicized below for emphasis) and I did the following analysis . . . - Jed
