Carbon tiles as spectral-shifter for long-life liquid blanket in LHD-type reactor FFHR

• Published in: Fusion engineering and design Vol. 81; no. 8; pp. 1299 - 1304
• Main Authors: Sagara, A., Imagawa, S., Tanaka, T., Muroga, T., Kubota, Y., Dolan, T., Hashizume, H., Kunugi, T., Fukada, S., Shimizu, A., Terai, T., Mitarai, O.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-02-2006; New York, NY Elsevier Science
• Subjects: Applied sciences; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Flibe blanket; Graphite; Helical reactor; Installations for energy generation and conversion: thermal and electrical energy; Neutron irradiation; Thermal conductivity; Neutron irradiation; Thermal conductivity; Helical reactor; Flibe blanket; Graphite; Breeder; Mechanical properties; Tritium; Stellarator; Carbon; Optimization; Finite element method; Thermal properties; Nuclear fusion reactor; Blanket; Cooling system; Temperature control; Chemical properties; Remote handling; First wall
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2005.09.067

In terms of engineering feasibility for long-life Flibe blanket in LHD-type reactor FFHR, the Spectral-shifter and Tritium breeder Blanket (STB) concept is evaluated by taking neutron irradiation effects into account under system integration such as Flibe cooling and components replacement. FEM calculations for the neutron wall loading of 1.5
MW/m
2 show that the temperature of the STB armor tile can be kept below 2000
K by optimizing the first metal wall thickness. The heat load experiment on the STB armor mockup confirms feasibility of the temperature control and mechanical joining. Degradation of STB armor tiles due to neutron irradiation requires replacement of them every few years by means of remote handling “screw coasters” using helical winding, where the replaced tiles are low level wastes. Although the STB concept is feasible within nuclear and thermal properties, more detailed structural optimization is needed including the mechanical and chemical properties.