@misc{oai:repo.qst.go.jp:00072744,
 author = {権, 暁星 and 谷川, 尚 and 廣瀬, 貴規 and 河村, 繕範 and 権 暁星 and 谷川 尚 and 廣瀬 貴規 and 河村 繕範},
 month = {Sep},
 note = {First wall of blanket in fusion reactor is subject to high surface heat flux as well as high coolant pressure simultaneously. The surface heat flux is 0.3 MW/m2 under ITER operating condition and would increase up to about 1 MW/m2 in a fusion reactor.  
The water cooled blanket has been developed and square cooling channel is adopted in the first wall in Japan. The square cooling channel could lead to good heat removal performance due to large effective surface area on heat transfer. However, high peak stress at the corner of the cooling channel might cause fatigue failure under cyclic loading. In contrast the circular cooling channel has advantages in the stress concentration.
 Present study focused on the shape of the cooling channel of the first wall. The surface heat flux and the coolant pressure were considered as parameters to clarify the thermal mechanical characteristics of the first wall with square and circular cooling channels. Temperature and stress responses in the first wall were evaluated by using finite element method. Stress intensity increased proportionally to the coolant pressure in the first wall with square cooling channel, but the stress intensity was almost constant in the first wall with circular cooling channel. For the circular cooling channel, tensile stress with the coolant pressure is canceled by the compressive stress with surface heat flux. In addition, the structural integrity of the first walls was evaluated by Design-By-Analysis method in ASME Boiler and Pressure Vessel Code (ASME BPVC). Based on the results allowable surface heat flux and coolant pressure were summarized as a design window of the first wall., 13th International Symposium on Fusion Nuclear Technology},
 title = {Thermal mechanical characteristics of blanket  first wall with different shape of cooling channel},
 year = {2017}
}