Status of engineering design of liquid lithium target in IFMIF-EVEDA

中村 博雄; Agostini, P.*; 荒 邦章; 深田 智*; 古谷 一幸*; Garin, P.*; Gessii, A.*; Giusti, D.*; Groeschel, F.*; 堀池 寛*; et al.

Fusion Engineering and Design, 84(2-6), p.252 - 258, 2009/06

https://doi.org/10.1016/j.fusengdes.2009.02.019

In IFMIF, target system consists of a target assembly, a Li main loop and a Li purification loop. In this paper, status of the engineering design of the IFMIF Li target system performed in 2007/2008 will be described. Major design requirement is to provide a stable Li at a speed of 10 m/s to 20 m/s. To realize stable Li flow, modification of the backplate with nearly constant radius curvature is applied. 3D thermal-hydraulic analysis of the Li target flow is in progress. By a hot trap, nitrogen concentration shall be controlled below 10 wppm. Tritium concentration shall be controlled by an yttrium hot trap below 1 wppm. The back-plate made of RAFM steel shall be used under intense neutron irradiation (50 dpa/y). To mitigate irradiation damage of the backplate, in-situ annealing up to 600C is considered. To replace the backplate, two design options of the remote handling systems are under investigation.