Fuel Debris Portal Site

International Research Institute for Nuclear Decommissioning (IRID) analyses estimate that there is a total of approximately 880 tons of fuel debris in Units 1~3.

(Breakdown) Unit 1: 279 tons, Unit 2: 237 tons, Unit 3: 364 tons

After the trial retrieval of fuel debris from Unit 2, we plan to gradually enlarge the scope of retrieval from around the mid-2020s.

The decommissioning of the Fukushima Daiichi Nuclear Power Station is being done in order to safely and steadily reduce risks associated with radioactive substances as quickly as possible. It is therefore important that we take each task one step at a time in order to achieve the objective of "completing decommissioning within 30-40 years" as noted in the Japanese Government's Mid/Long-Term Roadmap.

After placing it in sealed metal containers, the fuel debris will be relocated to an on-site storage facility at the Fukushima Daiichi Nuclear Power Station where it will be stored in a sealed metal or concrete room (dry storage).
We will coordinate with the Government on how to handle the fuel debris thereafter based on investigation results and R&D achievements, etc.

We will carefully proceed with the removal of fuel debris, placing the highest priority on safety so as not to affect the surrounding environment.
Daily measurement data and analysis results are disclosed so that the public can see air dose rates and radioactivity concentration measurements taken along site borders at the Fukushima Daiichi Nuclear Power Station as well as the status of each reactor.

Units 1~3 at the Fukushima Daiichi Nuclear Power Station are currently being kept in cold shutdown.
We are constantly monitoring the amount of rare gases 24 hours a day, which would increase if criticality were to occur. However, since the amount of rare gas generated is stable, we evaluate that the possibility of criticality occurring is extremely low.
Even if criticality were to occur, a boric acid solution would be injected to halt nuclear fission.