Critical design factors for sector transport maintenance in DEMO

Uto, Hiroyasu; Someya, Yoji; Tobita, Kenji; Asakura, Nobuyuki; Hoshino, Kazuo; Nakamura, Makoto

This paper mainly focuses on a sector transport maintenance scheme from the aspects of high plant availability. In this study, three different maintenance schemes were considered based on (1) the number of maintenance ports and (2) the insertion direction. The design study clarifies critical design factors and key engineering issues on the maintenance scheme; (1) how to support an enormous overturning force of the toroidal field coils in the large open port for sector transport and (2) define the transferring mechanism of sectors in the vacuum vessel. In addition, evaluating maintenance scenarios under the high decay heat is proposed for the first time. The key design factors are the cool down time in reactor and the cooling method in the maintenance scheme to keep components under operational temperature. Based on one-dimensional heat conduction analysis, after one month cool down time, each sector of SlimCS could be transported to the hot cell facility by gas-cooling.