Concept of Erbium Doped Uranium Oxide Fuel Cycle in Light Water Reactors

Abstract

This paper is aimed at the development of a fuel cycle concept for host countries with a lack of nuclear infrastructure. To minimize plutonium proliferation concern the adoption of long-life core with no fuel radiochemical treatment on site is suggested. Current investigation relies upon light water reactor technology and plutonium-free fresh fuel. Erbium doped to uranium oxide (enrichment 19.8%) fuel is selected as the reference. Such a high enrichment is selected in attempt to approach the longest irradiation time in one batch mode. In addition to that, uranium enriched up to 20% does not consider as a nuclear material for direct use in weapon manufacture. A sequence of two irradiation cycles for the same fuel rods in two different light water reactors is the key feature of the advocated approach. It is found that the synergism of PWR and pressure tube graphite reactor offers fuel burnup up to 140 GWd/tHM without compromising safety characteristics. Being as large as 8% in the final isotopic vector, fraction of 238 Pu serves as an inherent protective measure against plutonium proliferation.

Study of neutron induced reactions in rare earth isotopes

“…The rare earth isotopes, especially, are used or have been proposed to be used in several reactor assemblies, e.g. Dy and Er can be used as absorbing materials and burnable poisons [10,14].…”