Efforts to decommission TEPCO's Fukushima Daiichi Nuclear Power Station are still in progress.
Due to the failure of reactor cooling, the nuclear fuel overheated and melted together with peripheral metals, etc., and the resulting materials later cooled and hardened to become "fuel debris". Following the accident at TEPCO's Fukushima Daiichi Nuclear Power Station, Reactors 1-3 still contain fuel debris, however, the reactors are being maintained in a stable condition by continuously pouring water. Analysis of the progression of the accident and surveys conducted inside the reactors indicate that there has been no external leakage of molten fuel debris.
Monitoring of water and atmosphere is constantly being conducted on the perimeter of the power station, and impacts on life are confirmed to be sufficiently low. In the event where air dose rates or concentrations of radioactive materials in dust do increase, there is a setup in place for giving notification and taking countermeasures.