Information Portal for the Fukushima Daiichi Accident Analysis and Decommissioning Activities

Development of a system for collection, transport and storage of debris after retrievin

Purpose

Action status and evaluations and issues

  1. A system by which fuel debris is safely collected, transported and stored is developed.
    1. ⅰ) Development of overall plan and collection of related information.

      2. The studies have been conducted for the overall technical development plan and its issues by collating the reference information on system development, input from the related projects, and output from other projects. Also, in FY2015, information including the storage canister design, safety assessment technology, fuel debris dry technology is collected from overseas organizations.

    2. ⅱ) Implementation of design of storage canister and study on transport/storage system as R&D
      1.   Study of collection, transport and storage system of fuel debris

        2. The studies on the collection, transport, and storage system are carried out based on requirements assuming various types of fuel debris in light of the conditions of the Fukushima Daiichi NPS. (For the flow plan of export from R/B, refer to Fig 1, and of the storage side, refer to here (NDF Technical Strategic Plan 2016,page 4-115) and 4.4-3 respectively)
        and here (NDF Technical Strategic Plan 2016,page 4-116)

      2.   Development of canister technology for storing the fuel debris /safety assessment technology method
        •   The design conditions for storage canisters, basic functions and general shape were determined. (here (NDF Technical Strategic Plan 2016,page 4-114) Reference)
        •   Issues related to the safety assessment required for fuel debris canister design are collated and detailed study items were determined. (i.e. criticality evaluation, structural evaluation and countermeasure against hydrogen generation)
    3. ⅲ) Installation plan for facility storage of the fuel debris and its measures are required to be studied since much of the land within the Fukushima Daiichi NPS is now being used for the contaminated water tanks or temporary waste storage, and the space is limited for the system development.

  2. Prototype of storage canister and handling equipment and verification by mockup test

    3. Design is to be developed based on the basic specifications.

As mentioned above, now it is in the stage where development of the system up to storage process and studies on the basic specifications of storage canister are performed. The technical issues identified as the system develops should be handled appropriately. The issues clarified to date are described in the following section.



Figure 1　　Flow line for the fuel debris in the Partial submersion-Side access method