Induced nuclear reactions: processes – systems – and elements – Control component for a fission reactor – Wherein concentration of the reactivity affecting material...
Patent
1984-06-20
1987-04-07
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Control component for a fission reactor
Wherein concentration of the reactivity affecting material...
G21C 710
Patent
active
046559990
ABSTRACT:
A control rod for a nuclear reactor according to the present invention is such that neutron absorbing rods are surrounded with a second neutron absorber which differs in material from the neutron absorbing rods. In a case where the neutron absorbing rod is composed of boron carbide powder and a cladding for receiving the powder therein, the second neutron absorber is a sheet of a material having a neutron irradiation lifetime longer than that of boron carbide, for example, hafnium. In a case where the neutron absorbing rod is a round hafnium rod, the second neutron absorber having a neutron absorption worth higher than that of hafnium is located so as to surround the round hafnium rods. Thus, the neutron absorbing rods are effectively used, and the lifetime of the control rod can be prolonged in the former.
REFERENCES:
patent: 3103479 (1963-09-01), Ransohoff
patent: 3365368 (1968-01-01), Fray
patent: 4285769 (1981-08-01), Specker et al.
Maruyama Hiromi
Ohnishi Tadahiro
Behrend Harvey E.
Hitachi , Ltd.
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