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Atomistic simulations of fission gas bubbles in nuclear fuels

Matteo Canducci

Atomistic simulations of fission gas bubbles in nuclear fuels.

Rel. Monica Ferraris, Alexis Nuttin. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Energetica E Nucleare, 2024

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Abstract:

This master thesis investigates the role of nano-bubbles porosity on some of the main thermo-physical properties of the (U,Pu)O2 nuclear fuel using atomistic simulations. In the last years the role of mixed oxides fuels became increasingly relevant for current and fourth generation reactors, and better understanding the properties of the compound is crucial, especially the consequences of its irradiation. The goal of this work is thus to calculate, using molecular dynamics simulations, the specific heat, the linear thermal expansion coefficient, the elastic coefficients and the thermal conductivity of porous (U,Pu)O2, covering a wide range of plutonium contents, temperatures and bubbles characteristics. The effect of the nano-bubbles is presented for every simulation and a general law is proposed for each property by fitting the results obtained. The newly proposed laws are suitable to be implemented in the fuel performance codes, which study the materials’ behaviour at a larger scale.

Relators: Monica Ferraris, Alexis Nuttin
Academic year: 2023/24
Publication type: Electronic
Number of Pages: 105
Subjects:
Corso di laurea: Corso di laurea magistrale in Ingegneria Energetica E Nucleare
Classe di laurea: New organization > Master science > LM-30 - ENERGY AND NUCLEAR ENGINEERING
Ente in cotutela: INSTITUT NATIONAL POLYTECHNIQUE DE GRENOBLE (INPG) - PHELMA (FRANCIA)
Aziende collaboratrici: CEA CADARACHE
URI: http://webthesis.biblio.polito.it/id/eprint/31983
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