Fission Gas Release from Uranium Heated in Carbon DioxideStudy on the Behavior of Punctured Fuel Element for Calder Hall Type Reactor, (3)

摘要

An experiment to predict the amount of fission gas release from U heated in CO2 was made in connection with the safety evaluation of the Tokai Atomic Power Reactor. Fission gas release from slightly irradiated U pieces was measured as a function of percent oxidation, and it was found that the percent release was proportional to the percent oxidation. The fission gas released before the U was completely oxidized was 11%, 23% and 48% at 500°, 600° and 700°C, respectively. The form of temperature dependence of the fission gas release was of the Arrhenius type, with an activation energy of 5.1 kcal/mol.