This is an admission by the Japanese government that the amount of radiation released into the environment has reached a new order of magnitude. The fact that we have now confirmed the world's second-ever Level 7 accident will have huge consequences for the global nuclear industry. It shows that current safety standards are woefully inadequate.
Deputy Director General of Japan's nuclear regulator has said that the total amount of radioactive materials released from the plant equals 10-percent of what was released in Chernobyl.
More details at the source.