Developments and needs in nuclear analysis of fusion technology

•Complex fusion nuclear analyses require detailed models, sophisticated acceleration and coupling of cumbersome tools.•Progress on development of tools and methods to meet specific needs of fusion nuclear analysis reported.•Advances in production of reference models and in preparation and QA of acceleration and coupling algorithms shown.•Evaluation and adaptation studies of alternative transport codes presented.•Discussion made of the importance of efforts in these and other areas, considering some of the more pressing needs.