Japan Atomic Energy Body Sees Technical Hurdles Ahead, Wall Street Journal by Mitsuru Obe, September 14, 2011:
[...] The most difficult challenge facing Tepco is how to plug leakages in the primary containment structures [...]
The primary containment vessels, the main shield against radiation leaks, and the reactor buildings that house them, have been damaged [...]
The leakage means that the containment vessels are largely empty of water [...]
Tepco also needs to find ways to prevent any new nuclear reaction, which could happen if the fuel is not adequately cooled during the entire process.
Published: September 14th, 2011 at 3:11 pm ET