Evaluation of the cool-down behaviour of ITER FW beryllium tiles for an early failure detection

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• 作者：Thomas Weber ; ^{tho.weber@fz-juelich.de} ; Andreas Bü ; rger ; Karsten Dominiczak ; Gerald Pintsuk
• 关键词：High heat flux ; Cool down behaviour ; Crack growth ; First wall components
• 刊名：Nuclear Materials and Energy
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：9
• 期：Complete
• 页码：109-115
• 全文大小：2637 K
• 卷排序：9

文摘

The plasma facing Be tiles in ITER may detach from the supporting structure and overheat if the joint quality and performance were poor. Nevertheless, when a heat flux is applied the temperature gradient causes a bending of the tile. This bending can actually close the gap/crack so that the thermal conductivity is restored again. Thermo-mechanical FEM simulations demonstrate this principle and its influence on the cool-down. For practical reasons the use of an exponential fitting function is actually a good choice.