Uranium dioxide

Studies on modeling uranium dioxide (UO2) powder and pellet processes from ammonium uranyl carbonate (AUC)- derived uranium dioxide powder (UO2 ex-AUC powder) were reported in the paper.

14p vicedric 08-02-2023 7 3   Download

Studies on modeling uranium dioxide (UO2) powder and pellet processes from ammonium diuranate (ADU)- derived uranium dioxide powder (UO2 ex-ADU powder) were reported in the paper. A mathematical model describing the effect of the fabrication parameters on specific surface area (SSA) of UO2 powders was built up.

12p vidumbledore 06-01-2023 10 2   Download

The paper investigates various computational modelling issues associated with VVER-440 fuel depletion, relevant to burnup credit. The SCALE system and the TRITON sequence are used for the calculations. The effects of variations in depletion parameters and used calculation methods on the isotopic vectors are investigated. The burnup behaviour of Gadolinium is quite important in actual core analysis, but its behaviour is somewhat complicated, requiring special treatment in numerical modelling and calculations.

9p trinhthamhodang1218 14-03-2021 9 1   Download

Determination of the melting point of fuel is essential for designing and operating nuclear reactors. We investigate the melting point of uranium dioxide by molecular dynamics simulation based on the change of the displacement of oxygen atoms, the radial distribution function, the density and the network structure of UO2 fuel.

5p tamynhan9 02-12-2020 8 1   Download

In this work, the kinetics rates have been measured by optical microscopy using a single particle approach. The advantages of this analytical technique are an easier management of species transport in solution and a precise following of the dissolution rate.

12p christabelhuynh 30-05-2020 6 2   Download

This article draws a state of knowledge of the dissolution of uranium dioxide in nitric acid media. The chemistry of the reaction is first investigated, and two reactions appear as most suitable to describe the mechanism, leading to the formation of monoxide and dioxide nitrogen as reaction by-products, while the oxidation mechanism is shown to happen before solubilization.

13p christabelhuynh 30-05-2020 3 0   Download

This study aims at better understanding the chemical and physico-chemical phenomena of uranium dioxide dissolution reactions in nitric acid media in the Purex process, which separates the reusable materials and the final wastes of the spent nuclear fuels.

13p christabelhuynh 29-05-2020 11 0   Download