Abstract: In this article, a preliminary safety assessment calculation is taken to discuss the safety of deep borehole disposal of SF. The calculation work is based on existing conceptual design with input source term chosen from a specific SF’s radionuclides. For the radionuclide migration pathway, drinking water though well above the disposal borehole is selected under conservative assumption. Calculation result shows that the maximum individual radiation dose is 0.045 mSv/a, arising in the 8 200 year after closure of the disposal borehole, which was mainly caused by I-129. This result can provide a good reference for R&D work of deep borehole disposal in China.

Key words: deep borehole disposal, spent fuel, scenario analysis, radionuclide migration, safety assessment