[en] A preliminary conceptual design of dual-cooled long-lived radioactive waste transmutation blanket for the Fusion-Driven sub-critical hybrid System (FDS) is presented on the basis of feasible plasma physics and technology level i.e. the neutron wall loading is assumed to 0.5 MW/m² with availability of 50%. The concept has the attractive advantages e.g. tritium is self-sustainable, plutonium for the purpose of neutron multiplication is self-sustainable and the thermal power output is stable. The one-dimensional neutronic transport calculation using the discrete ordinate method and burnup calculation using the direct numerical method are carried out to assess the performance of the blanket

[en] The genus Lactuca, known as vegetables or oil crops, is widely cultivated in Canada, Australia, European and Asian countries. To satisfy people’s demands of nutrition and taste on lettuces, abundant germplasm and hybrids have been bred by breeding programs or hybridized naturally. This makes variety identification of these germplasm and hybrids difficult, and baffles the following trait improvement and target selection by breeding programs. In this study, we selected 18 distinguished edible lettuce varieties, and evaluated their genetic divergence and phylogenetic relationship based on multi DNA markers to search for an effective method of variety discrimination. DNA alignment results suggested that the rRNA 5S gene was the most variable DNA marker among investigated markers, and the nrDNA ITS gene was not sensitive between Lactuca and Brassica genera. In the 5S phylogenetic tree, all materials were divided into two groups, and the grouping pattern was considered to be related with leaf color but not leaf shape. S3 and S5 had two nucleotide array deletions and one addition as comparison to other lettuces, sharing relatively nearer phylogenetic relationship compared to other lettuces. By analyzing multi DNA markers, the relations between grouping and leaf color and shape were further improved in the combined phylogenetic tree. This work could help to direct lettuce variety discrimination and target selection for breeding programs. The most informative DNA marker for lettuce variety discrimination could be applied in the variety discrimination of other plant species. (author)

[en] Lithium lead (Li₁₇Pb₈₃) is presently considered as a primary candidate tritium breeder for fusion power reactors because of its attractive properties. Its induced radioactivity by D-T fusion neutrons was calculated with the fusion power reactor (FDS-II) as the reference reactor. The results were compared with the activation levels of other tritium breeders, such as Li₄SiO₄, Li₂TiO₃, Li₂O, Li, etc., under the same irradiation conditions. Furthermore, the dominant nuclides to dose rate of Li₁₇Pb₈₃ and the effects of irradiation time on the activation characteristics of Li₁₇Pb₈₃ were analyzed

[en] The dual-cooled waste transmutation (DWT) blanket is one of the key components of the fusion-driven subcritical system (FDS-I). Because of the large energy gain, the heat removal in accidents remains a major safety concern. In this contribution, several representative transients such as unprotected loss of flow accident in helium gas and LiPb (ULOFA), protected loss of flow accident in helium gas and LiPb (LOFA) and loss of power accident (LOPA) are calculated and analyzed. The blanket will not melt until several hours if the plasma core is shut down in time when the accidents occur. It has enough time to start additional action to keep the system safety. The results show that passive solution to shut down the plasma shall be given due to the little scale of responding time. Also, the results show an effective active heat removal solution such as liquid metal (LM) drain system and emergency blanket cooling system is needed