The explosion [at Japan’s Fukushima plant], he said, was due to hydrogen buildup in the steam piping that mixed with oxygen, and that there was no damage to the container with the nuclear fuel. TEPCO has been filling the container with seawater combined with boric acid to cool the reactor, which Mr Edano called an “unprecedented” remedy. Boric acid, as well as being a strong neutron absorber to prevent the nuclear fuel from overheating, will also make the reactor much harder to get running again.
I wasn’t worried until they began taking steps that could undermine the future operation of the reactor. If they are running those risks now, they must really be worried about what could happen if they do not set things right.
Also, it is virtually guaranteed that the company running the plant and the Japanese government will play down the seriousness of the accident to the greatest possible degree. That suggests it may be worse than reported so far.
Choosing nuclear power involves special risks.