Preliminary approach for safety disposal of radioactive wastes from FDNPS for optimization of waste management stream

Iijima, Kazuki  

On the way of decommissioning of Fukushima Daiichi Nuclear Power Station (FDNPS), huge amount of various radioactive solid wastes will be generated. Large uncertainties of their characteristics and amount are major obstacles in considering future waste treatment and disposal strategies. In this study, approaches of safety assessment of waste disposal were investigated in order to clarify the required waste properties and optimize the entire waste stream. In case of FDNPS wastes, due to the generic conditions with large uncertainties, too much conservative assumption leads to too robust requirement for disposal system, so that the assessment in the reference case should be carried out under the most plausible condition. As a next step, conservative case should be defined considering the reasonable uncertainties with scientific basis.