1977-09-23
1980-10-21
Nelson, Peter A.
176 78, G21C 302
Patent
active
042292581
ABSTRACT:
A fuel assembly suitable for use in boiling water reactor. The fuel assembly has a specific pattern of distribution of enrichment, so that the upper region of the assembly has a larger infinite multiplication factor than that of the lower region. In an example, the distribution of enrichment is such that the upper region has a mean enrichment larger than that of the lower region, while, in another example, the mean enrichment is maintained constant over the length of the assembly but the difference of enrichments between the central and peripheral portions of a plane normal to the axis of the assembly is made smaller at the upper region than at the lower region.
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patent: 3745069 (1973-07-01), Sofer et al.
patent: 3799839 (1974-03-01), Fisher et al.
patent: 3986924 (1976-10-01), Motoda
patent: 4040902 (1977-08-01), Mysels
Barth et al., Power-Flattening Techniques, Nucleonics, May, 1965, pp. 72-73.
McFarlane, Physics of Operating Pressurized Water Reactors, Nuc. Applications & Tech., vol. 9, Nov. 1970, pp. 634-639.
Kurihara Kunitoshi
Takamatsu Jun
Takeda Renzo
Uchikawa Sadao
Yamamoto Masaaki
Hitachi , Ltd.
Nelson Peter A.
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