Information from Iwakami Yasumi’s USTREAM channel netcasting the workshop of an Osaka citizens’ group “Kansai network to stop the disaster-debris acceptance” with a panel of experts including European experts.
http://macayanez.com/wp-content/themes/nuance/functions/jwpanel/scripts/valums_uploader/php.php One Japanese expert, Hiromitsu Ino, said a Containment Vessel at Fukushima II (Daini) is broken, and they are trying to repair it. It was probably caused by the earthquake, not tsunami.
The workshop is on-going at this link: http://www.ustream.tv/channel/iwj-osaka1#utm_campaign=t.co&utm_source=8481429&utm_medium=social
Hiromitsu Ino is professor emeritus at Tokyo University. His area of specialty is metallic materials science. He is the head of the Group of Concerned Scientists and Engineers Calling for the Closure of the Kashiwazaki-Kariwa Nuclear Power Plant.
I still remember a tweet last summer (I think) saying an acquaintance fleeing from the area near Fukushima II Nuke Plant right after the earthquake saw a smoke coming out of one of the reactor buildings (there are 4). Fukushima II, unlike Fukushima I, has 4 Mark-II type boiling water reactors built by Toshiba and Hitachi.