Improvement of biosphere assessment methodology for performance assessment of geological disposal facility. 4

This report presents results on trial study of methodology to identify Geosphere-biosphere Interface (GBI), which have been considered, and examination in consideration of overseas trend of long-term biosphere assessment. Regarding trial study of methodology to identify GBI, the important matter and subject of GBI identification methodology, that have been developed in the last year, was considered and arranged based on results of literature survey and using several hypothetical biosphere environmental cases (ex. geographical, geological, hydrological features) in Japan. Regarding examination and consideration of overseas trend of long-term biosphere assessment, a review of relevant information from three international biosphere programmes (BIOCLIM, BIOMOSA and BIOPROTA, that related with biosphere assessment modelling) was carried out. Furthermore referring the effects of these programmes, approaches and technological issues relating biosphere assessment for Japanese HLW disposal safety programme was researched. (author)