Construction of knowledge base for geological disposal technologies of high-level radioactive waste Report in 2005. Separate volume 3: Development of safety assessment methods

The results of development of safety assessment methods by JNC after the second report are reported. JNC-Thermodynamic and JNC-Sorption Database of nuclides was prepared and used. The mass transfer process model in rock, the water quality model of underwater and pore water and approach to modeling radionuclide transport in biosphere were improved. The phenomenological nuclide transport model and the effect assessment model of colloid, natural organic compounds and microorganism were developed. On scenario of safety assessment method, the behaviors in the disposal system were expressed by FEP (Features, Events, and Processes). The effects of data uncertainty and model uncertainty were improved by the assessment technologies and the sensitivity analysis technology. JGIS (JNC Geological Disposal Information Integration System) was developed. The main performance of JGIS was shown. It consists of six chapters; the first chapter is introduction, the second chapter the nuclides transport database, the third the safety assessment model, the forth improvement of safety assessment methods, the fifth application of safety assessment methods and the sixth results and summary. (S.Y.)