Formation of Nanostructures in UO_2 Fuel at High Burn-ups

• Authors: M. Szuta , I. Bocar
• Languages of publication: EN

Abstracts

EN

In the present paper it is assumed that above a limiting value of fission fluency (burn-up) a more intensive process of irradiation induced chemical interaction occurs. A significant part of fission gas product is thus expected to be chemically bounded in the matrix of UO_2 fuel. The fission gas atoms substituting, for example, uranium atoms in the crystallographic lattice can form weak facets. At a certain saturation condition, division of the grains can occur at the weak facets and the increase in fission-gas-products release may be expected. The fact that the process of grain division for high burn-ups (70-80 MWd/kgU) forms an extremely fine structure up to a temperature as high as 1100^ºC and simultaneously the observed decrease in fission gas concentration in the fuel supports this concept. The analysis of fission gas concentration change due to the formation of nanostructures in UO_2 fuel at high burn-ups in terms of total surface area change in a function of burn-up and knock-out process is presented.

Keywords

EN

25.85.Ec; 66.30.Lw

Discipline

• 25.85.Ec: Neutron-induced fission
• 66.30.Lw: Diffusion of other defects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2002
• Volume: 102
• Issue: 2
• Pages: 207-213

Dates

published

2002-08

received

2001-09-23

Contributors

author

M. Szuta

• Institute of Atomic Energy, 05-400 Otwock-Świerk, Poland

author

I. Bocar

• Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska 25, 00-665 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.102.207