If in the nuclear reactors in Japan, a sizeable core-melt occurs, it could give rise to explosive metal-water reactions, which could disintegrate the reactor core, disperse radioactive substances, and breach the ultimate containment.
When that happens, dangerous species of radioactive fission products in the gaseous and micro-dust and droplet form could spread over large areas, depending on win
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/why-should-jaitapur-be-made-guinea-pig-untested-reactor
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/radioactive-waste
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-power
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ratnagiri-d
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-power-corporation-india-npcil