Fuel bundle for use in heavy water cooled reactors

Details Fuel bundle for use in heavy water cooled reactors Fuel bundle for use in heavy water cooled reactors

G - Physics

21

C

G21C 3/326 (2006.01) G21C 3/328 (2006.01) G21C 5/02 (2006.01) G21C 7/02 (2006.01)

Patent

CA 2097412

A fuel bundle for use in a heavy water cooled pressure tube reactor, having a plurality of elongated fuel rods or elements disposed therein, and in which a positive reactivity component is produced by a change in neutron spectrum and flux across the bundle, upon a decrease in coolant density, the improvement consists of placing fissile material for producing an increase in neutron multiplication, in a first region of the fuel bundle wherein the thermal neutron flux tends to decrease upon a decrease in coolant density, placing fertile material, in a second region of the fuel bundle wherein the thermal neutron flux tends to increase upon a decrease in coolant density, placing neutron absorber material mixed with the fertile material to absorb thermal neutrons in the second region, having neutron scattering material, disposed in a third region of the fuel bundle between the first and second regions, such that the mixture of the fertile material and the absorber in the second region redistributes the neutron flux across the bundle and thereby produces a negative reactivity component, when the coolant density decreases.

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