Recoil Based Fuel Breeding Fuel Structure
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1104-NN07-21
Recoil Based Fuel Breeding Fuel Structure Liviu Popa-Simil R&D, LAVM LLC., Los Alamos, NM, 87544 Abstract Nuclear transmutation reactions are based on the absorption of a smaller particle as neutron, proton, deuteron, alpha, etc. The resulting compound nucleus gets out of its initial lattice mainly by taking the recoil, also with help from its sudden change in chemical properties. The recoil implantation is used in correlation with thin and ultra thin materials mainly for producing radiopharmaceuticals and ultra-thin layer radioactive tracers. In nuclear reactors, the use of nanoparticulate pellets could facilitate the recoil implantation for breeding, transmutation and partitioning purposes. Using enriched 238U or 232Th leads to 239Pu and 233U production while using other actinides as 240Pu, 241Am etc. leads to actinide burning. When such a lattice is immersed into a radiation resistant fluid (water, methanol, etc.), the recoiled product is transferred into the flowing fluid and removed from the hot area using a concentrator/purifier, preventing the occurrence of secondary transmutation reactions. The simulation of nuclear collision and energy transfer shows that the impacted nucleus recoils in the interstitial space creating a defect or lives small lattices. The defect diffuses, and if no recombination occurs it stops at the lattices boundaries. The nano-grains are coated in thin layer to get a hydrophilic shell to be washed by the collection liquid the particle is immersed in. The efficiency of collection depends on particle magnitude and nuclear reaction channel parameters. For 239Pu the direct recoil extraction rate is about 70% for 238UO2 grains of 5 nm diameters and is brought up to 95% by diffusion due to 239Neptunium incompatibility with Uranium dioxide lattice. Particles of 5 nm are hard to produce so a structure using particles of 100 nm have been tested. The particles were obtained by plasma sputtering in oxygen atmosphere. A novel effect as nanocluster radiation damage robustness and cluster amplified defects rejection will be discussed. The advantage of the method and device is its ability of producing small amount of isotopic materials easy to separate, using the nuclear reactors, with higher yield than the accelerator based methods and requiring less chemistry. Introduction The interest for a direct production of nuclear materials by transmutation is related to the fact that from the actual natural resources of actinides used as nuclear materials less than 0.2% is used from the extracted uranium yellow cake [1]. The Uranium resources [1] are evaluated at 35 109 kg while Thorium [2, 3] is estimated at 1.4 109 kg that are enough for about 400 years to support the actual 440 nuclear reactors, but less than 30 years to cover completely the planet’s actual energy needs if same uranium usage procedure is maintained only. The nonproliferation fears generated an acute situation related to the actual overstocks of weapon grade Plutonium [4] and HEU [5] (highly enriched uranium) pushing to degrad
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