According to a Reuters article, several tanks holding “highly contaminated” water used to flood and cool Fukushima’s damaged nuclear reactors have leaked, and some liquid may have contaminated the Pacific Ocean.
The concentration of beta-emitting isotopes in the spilled water is more than 6,000 times the legal limit. Recurring breaches in the containment system put together by Tokyo Electric Power Company baffle the utility’s clean up team. International alarm is increasing, prodding the Japanese government to step in.
Read more here: http://www.reuters.com/article/2013/10/03/us-japan-fukushima-water-idUSBRE99200R20131003