Seal radiation off completely by DECOPOD + precast concrete (PC) walls, ensuring the same level of safety as a concrete facility!
Kawahara Technical Research (KTR) has added to its product portfolio DECOPOD Type 1800, especially designed to transport/transfer radioactive waste to a final disposal site or temporary storage facility. As waste contained in conventional flexible container bags takes an uneven form, it requires more labor and time for transport/transfer, and it also has safety issues. However, the new DECOPOD Type 1800 significantly increases transport/transfer efficiency, improves worker safety, and prevents spread and leakage of radioactive substances. The product resolves all issues related to transport from a temporary storage site to a disposal facility, which has always been a problem for major general contractors. In addition, even if the construction of the disposal facility is delayed, all that is needed is to fill the DECOPOD containers with existing flexible container bags, and then stack and interlock the containers. This not only improves safety, but also offers a sense of security to local residents.

DECOPOD + PC Walls Installation Plan①

Estimated radiation transmittance
※Fill DECOPODs with high-level radioactive waste of 100,000Bq/kg, and stack them up to four tiers to form an island (aggregation). Then, cover the island with concrete panels with a thickness of 250mm.

DECOPOD + PC Walls Installation Plan②

Estimated radiation transmittance
※Horizontally interlock 10 DECOPODs, filled with high-level radioactive waste of 5,000,000Bq/kg, and then attach one DECOPOD each, filled with low-level radioactive waste, at right and left ends. Next, stack up three tiers of DECOPODs filled with high-level radioactive waste, and on top of them, place another tier of DECOPODs filled with low-level radioactive waste, to form a four-tier island (aggregation). Finally, cover the island with concrete panels with a thickness of 250mm.

Preconditions for the calculation of shielding performance
● Radioelements: Cs134 and Cs137; γ-ray energy: 662keV
●The shielding rate of the soil is calculated based on the atomic composition ratio derived from X-ray fluorescence analysis.
●The shielding rate of the concrete is calculated based on a hypothetical atomic composition ratio.
●Radiation from two or more DECOPODs away, from deep inside the island, and diagonal radiation were not included in the calculation because they have little impact.
●The value of surface dose rate of radioactive waste is the measured data cited from the guidelines published by the Japanese Ministry of the Environment (dose rate measured at a point 1cm away from the container).
●Calculation of shielding capability of one DECOPOD: SUS 3mm (side plate thickness) + shielding material 57.4cm + SUS 3mm (side plate thickness)
Tested and supervised by: Shuji Miyamoto, Doctor of Engineering, Professor at University of Hyogo, and Director of Laboratory of Advanced Science and Technology for Industry