537 



for structures, insulators, and other applica- 

 tions, are central to the development of an 

 attractive fusion reactor. Thus, a new, powerful 

 source of neutrons is indispensable for fusion 

 technology research and development. Therefore, 

 international collaboration should be pursued on 

 definition and technical realization of such a 

 source. 



ii) Plasma - Materials Interactions and High Heat 

 Flux Experiments and Testing 



Key test facilities exist for conducting high 

 heat flux experiments and simulations of plasma 

 surface interactions with in-vessel components 

 and the firstwall, but not on a world-wide basis. 

 Therefore, international collaboration in this 

 basic area should be explored. 



iii) Fusion Blanket Technology and Tritium Breeding - 

 Issues, Phenomena and Required Experiments 



A basic understanding of the critical issues for 

 fusion nuclear technology is being developed but 

 is incomplete. Identification and characteriza- 

 tion is needed of fusion nuclear technology 

 issues for which new knowledge is required. 

 Therefore, international collaboration in a 

 joint assessment of the most critical fusion 

 nuclear technology issues is important and is 

 required for future planning. This is especially 

 true with respect to identification of new, 

 required experimental facilities. 



International collaboration using existing 

 facilities in several countries, including 14 MeV 

 neutron sources and fission reactors, can be used 

 for experiments on breeding materials, tritium 

 diffusion and recovery, and uncertainties in 

 neutronics methods. 



iv) Tritium Fuel Cycle 



Tritium handling and processing in the vacuum 

 exhaust system and blanket recovery system are 

 a basic aspect of a DT fusion reactor. Therefore, 

 international collaboration on experiments to 

 develop the data required for fusion reactors 

 should be encouraged. 



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