Roadmap towards Restoration from the Accident at Fukushima Daiichi Nuclear Power Station

Installation of support structure under the spent fuel pool of Unit 4

■Objectives

Since the walls of the reactor building, Unit 4 are severely damaged, we have been evaluating the seismic capacity to confirm the soundness of the building. As the result of the evaluation, we have decided to install support structure under the spent fuel pool to enhance safety of the building.

■Work Overview

- Install steel support under the spent fuel pool to sustain the weight above

- To secure its function, install concrete wall and fill up grout between the concrete wall and the bottom of the spent fuel poll

■Schedule

We are now developing detailed work plan and plan to start the preparation work from early May. Then, we will start the main work from mid-May and complete it at the end of July. We expect to finish the installation of steel support by mid-June. Thereafter, we can anticipate that the load will be decreased.

Overview of installation of support structure under the spent fuel pool

End