Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1991-03-14
1992-12-01
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376443, 376444, 376439, G21C 334
Patent
active
051679116
ABSTRACT:
A fuel assembly comprises a plurality of fuel rods which contain nuclear fuel material inside, a lower tie plate which holds the lower end of the fuel rods and has a path inside to lead coolant between the fuel rods, and a channel box which encloses a bundle of the fuel rods. An orifice, in which a plurality of round rods are arranged to cross the coolant flow path, is installed in a through hole at a side wall of the lower tie plate by connecting to the side wall. Orifice coefficient of the orifice becomes large at small flow rate of coolant which supplied to the fuel assembly, and becomes small at large flow rate of coolant. By using the fuel assembly described above, void fraction in a gap region between fuel assemblies can be altered during beginning and end of an operation cycle of the nuclear reactor.
REFERENCES:
patent: 4035233 (1977-07-01), Williamson et al.
patent: 4863680 (1989-09-01), Sakurada et al.
patent: 4970047 (1990-11-01), Ueda et al.
patent: 4997621 (1991-03-01), Johansson et al.
Bessho Yasunori
Fujimura Koji
Ishii Yoshihiko
Nakajima Junjiro
Uchikawa Sadao
Chelliah Meena
Hitachi , Ltd.
Hunt Brooks H.
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