Method for incinerating transuranian chemical elements and...

G - Physics – 21 – G

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G21G 1/02 (2006.01) G21C 1/30 (2006.01)

Patent

CA 2402129

The invention concerns a method for incinerating transuranian chemical elements, such as long lasting radioactive waste and plutonium which consists in using a nuclear reactor whereof the core (12) operates at low-level criticality. Said level is selected substantially equal to the difference .beta.¿S? between a desired fraction .beta.¿T? of delayed neutrons in the core and the real fraction .beta.. An external source spallation reaction neutrons comprises a proton accelerator (22) the power of which is adjusted, in real time, on the neutron flux measured in the core (12), thereby enabling to inject into the reactor core a supplementary fraction of delayed neutrons equal to the difference .beta.¿S?. The reactor is operates and is monitored like a standard reactor.

Pour incinérer les éléments chimiques transuraniens, tels que les déchets nucléaires à vie longue et le plutonium, on utilise un réacteur nucléaire dont le coeur (12) fonctionne à un faible niveau de sous criticité. Ce niveau est choisi sensiblement égal à la différence .beta.S entre une fraction souhaitée .beta.T de neutrons retardés dans le coeur et la fraction réelle .beta.. Une source externe de neutrons de spallation inclut un accélérateur de protons (22) dont on ajuste la puissance, en temps réel, sur le flux neutronique mesuré dans le coeur (12). On injecte ainsi dans le coeur du réacteur une fraction de neutrons retardés supplémentaire égale à la différence .beta.S. Le réacteur se comporte et se pilote alors comme un réacteur critique classique.

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