Assessment of remote maintenance schemes for BA DEMO reactor

Uto, Hiroyasu; Tobita, Kenji; Someya, Yoji; Kakudate, Satoshi; Tanigawa, Hisashi; Asakura, Nobuyuki; Sakamoto, Yoshiteru; Hoshino, Kazuo; Nakamura, Makoto; Tokunaga, Shinsuke

Maintenance schemes are one of the critical issues in DEMO design, significantly affecting the configuration of in-vessel components, the size of toroidal field (TF) coil, the arrangement of poloidal field (PF) coils, reactor building, hot cell and so forth. Therefore, the maintenance schemes should satisfy many design requirements and criteria to assure reliable and safe plant operation and to attain reasonable plant availability. In this study, we categorize various schemes in term of [1] the maintenance port position for transporting blanket segments, [2] blanket segmentation, and [3] divertor segmentation. The design study clarifies some assessment factors on DEMO remote maintenance scheme, for example, (1) minimization of the size and magnetic stored energy of TF coil and PF coils, (2) divertor maintenance. This presentation describes engineering design of each maintenance schemes and evaluation results of comparison among maintenance schemes.