10:00 〜 10:15
[3C02] Effects of Groundwater Flow and Saltwater Intrusion under Coastal Seabed Sediment on Radionuclide Releases Rate from a HLW Disposal
キーワード：Geological disposal, High-level radioactive waste (HLW), Groundwater , Saltwater intrusion, PFLOTRAN
Coastal seabed disposal is one of the disposal options isolating high-level radioactive wastes (HLW) from human. HLW under seabed sediments would be covered by various layers of sediments. Radionuclide transport simulation with flat strata consisting of various sediments was performed to interpret the effects of groundwater flows caused by mixing of fresh and saline groundwater on radionuclide release rates from a hypothetical HLW repository. The results showed that the release of non-sorbing radionuclide to the top of the inland zone was lower while the intrinsic permeability was higher as it was confined in the original stratum and move further into the inland zone.