Along with the report of an internal explosion at the Fukushima No 2 reactor reports of what seems to be at least a partial reactor containment breach have been made:
Part of the container of a troubled nuclear reactor appears to be damaged, the Japanese government said today, a development that could indicate the possibility of serious radiation leaks.Chief cabinet secretary Yukio Edano told reporters “damage appears on the suppression pool” – the bottom part of the container that contains water used to cool the reactor and control air pressure inside.
“But we have not recorded any sudden jump in radiation indicators,” Mr Edano said, without elaborating.
Japan fears damage to reactor container AFP via ABC 14 Mar 11
TEPCO reports the partial evacuation of operators from the facility. Previously there was a report of an explosion at Fukushima No 2:
TOKYO – Japan’s nuclear safety agency says an explosion has been heard at Unit 2 of the Fukushima Dai-ichi nuclear plant. An agency spokesman speaking Tuesday on national television said the explosion was heard at 6:10 a.m.Japanese agency: Explosion heard at nuclear plant AP via Yahoo News 14 Mar 11
In the TEPCO news conference recently the translator mentioned that the explosion was heard “…in the vicinity of the reactor.”