Production of Pa-U Fuel with Proliferation Resistance by 14 MeV Neutron for Long-life Core


          

刊名：Journal of Nuclear Science and Technology
作者：Tomo IMAMURA
Masaki SAITO
Tadashi YOSHIDA
Vladimir ARTISYUK
刊号：723D0064
ISSN：0022-3131
出版年：2004
年卷期：2004, vol.41, no.6
页码：655-664
总页数：10
分类号：TL1
关键词：Protactinium 231；Proliferation resistance；Fusion neutrons；Long-life core；Thorium cycle；High burn-up；Uranium 232；Uranium 233
参考中译：
语种：eng
文摘：Protactinium-231 has an attractive potential to reduce the initial excess-reactivity and to be effectively converted to the fissile nuclide 233{sup left}U through 232{sup left}U. Thus, 231{sup left}Pa serves as the burnable fertile material helping to achieve a long-life core. However, the natural abundance of 231{sup left}Pa is negligible. Therefore, the production of 231{sup left}Pa has been studied in a fusion blanket with a ThO{sub}2 zone, which is irradiated by 14MeY neutrons to cause the (n,2n) reaction in 232{sup left}Th at a neutron wall load of IMW/m{sup}2. The mass balance of 233{sup left}Pa shows that the one fusion reactor with approximately 1.1GW{sub}(th) and 195t of ThO{sub}2 supports the one pebble bed-type gas cooled reactor with approximately 1 GW{sub}(th) and 10-year lifetime (700 GWD/t). It is also shown that the attractive fertile nuclide 231{sup left}Pa is produced with a fissile nuclide 233{sup left}U and a small fraction of 232{sup left}U which enhances the proliferation resistance for the fissile product 233{sup left}U due to the generation of high decay heat and strong gamma rays. In the present study, the isotopic fraction of 232{sup left}U is increased to over 2,4% by controlling the neutron spectrum in the ThO{sub}2 zone. As a result, the fissile nuclide 232{sup left}U could be always protected by 233{sup left}U throughout the thorium fuel cycle based on 231{sup left}Pa.



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