Study on Microbial Influence Assessment in Geological Disposal (II)

Fukunaga, Sakae*; Iwata, Yumiko*; Kanno, Takeshi*; Kudo, Akira*

This report summarizes two investigations concerned with microbial influence in geological disposal facilities. 1)Literature surevey on simulation models for the microbial-influence evaluation. 2)Interaction between Sulfate reducing bacteria(SRB) and Pu. For simulation models, we found some papers on gas production, geochemistry, microbial corrosion and microbial amount. To make the microbial-influence evaluation more reliable, it will be necessary to study subjects such as biodegradability of organic matter, microbial amount and certification of models. The sorption experiment for Pu onto SRB was conducted. It resulted in that effects of sterilization on the distribution coefficientat were not evident at Eh=-135mV.