Hybrid nuclear reactor grey rod to obtain required reactivity wo

Details Hybrid nuclear reactor grey rod to obtain required reactivity wo Hybrid nuclear reactor grey rod to obtain required reactivity wo

1989-07-10

1991-11-12

Bentley, Stephen C.

Induced nuclear reactions: processes, systems, and elements

Control component for a fission reactor

Wherein concentration of the reactivity affecting material...

G21C 7103, G21C 7117

Patent

active

050646079

ABSTRACT:
Hybrid nuclear reactor grey rods are described, wherein geometric combinations of relatively weak neutron absorber materials such as stainless steel, zirconium or INCONEL, and relatively strong neutron absorber materials, such as hafnium, silver-indium cadmium and boron carbide, are used to obtain the reactivity worths required to reach zero boron change load follow. One embodiment includes a grey rod which has combinations of weak and strong neutron absorber pellets in a stainless steel cladding. The respective pellets can be of differing heights. A second embodiment includes a grey rod with a relatively thick stainless steel cladding receiving relatively strong neutron absorber pellets only. A third embodiment includes annular relatively weak netron absorber pellets with a smaller diameter pellet of relatively strong absorber material contained within the aperture of each relatively weak absorber pellet. The fourth embodiment includes pellets made of a homogeneous alloy of hafnium and a relatively weak absorber material, with the percentage of hafnium chosen to obtain the desired reactivity worth.

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