Thermochemical modeling of nuclear fuel and the effects of oxygen potential buffers

Henri Loukusa (Corresponding Author), Timo Ikonen, Ville Valtavirta, Ville Tulkki

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The elemental and chemical composition of nuclear fuel pellets are key factors influencing the material properties of the pellets. The oxidation state of the fuel is one of the most important chemical properties influencing the material properties of the fuel, and it can only be determined with the knowledge of the chemical composition. A measure of the oxidation state is the oxygen chemical potential of the fuel. It can be buffered by redox pairs, such as the well-known Mo/MoO2 pair. In this work, the elemental composition of the fuel is obtained from a burnup calculation and the temperature and pressure calculated with a fuel performance code. An estimate of the oxygen potential of fuel is calculated with Gibbs energy minimization. The results are compared against experimental data from the literature. The significance of the UMoO6 compound and its buffering effect on the oxygen potential is emphasized.
Original languageEnglish
Pages (from-to)101-110
JournalJournal of Nuclear Materials
Volume481
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

nuclear fuels
Nuclear fuels
Buffers
buffers
Oxygen
oxygen
pellets
Materials properties
Nuclear fuel pellets
chemical composition
Chemical analysis
Oxidation
oxidation
Chemical potential
Gibbs free energy
chemical properties
Chemical properties
optimization
estimates

Keywords

  • thermochemical modeling
  • nuclear fuel
  • oxygen potential
  • buffering

Cite this

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title = "Thermochemical modeling of nuclear fuel and the effects of oxygen potential buffers",
abstract = "The elemental and chemical composition of nuclear fuel pellets are key factors influencing the material properties of the pellets. The oxidation state of the fuel is one of the most important chemical properties influencing the material properties of the fuel, and it can only be determined with the knowledge of the chemical composition. A measure of the oxidation state is the oxygen chemical potential of the fuel. It can be buffered by redox pairs, such as the well-known Mo/MoO2 pair. In this work, the elemental composition of the fuel is obtained from a burnup calculation and the temperature and pressure calculated with a fuel performance code. An estimate of the oxygen potential of fuel is calculated with Gibbs energy minimization. The results are compared against experimental data from the literature. The significance of the UMoO6 compound and its buffering effect on the oxygen potential is emphasized.",
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author = "Henri Loukusa and Timo Ikonen and Ville Valtavirta and Ville Tulkki",
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Thermochemical modeling of nuclear fuel and the effects of oxygen potential buffers. / Loukusa, Henri (Corresponding Author); Ikonen, Timo; Valtavirta, Ville; Tulkki, Ville.

In: Journal of Nuclear Materials, Vol. 481, 2016, p. 101-110.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Thermochemical modeling of nuclear fuel and the effects of oxygen potential buffers

AU - Loukusa, Henri

AU - Ikonen, Timo

AU - Valtavirta, Ville

AU - Tulkki, Ville

PY - 2016

Y1 - 2016

N2 - The elemental and chemical composition of nuclear fuel pellets are key factors influencing the material properties of the pellets. The oxidation state of the fuel is one of the most important chemical properties influencing the material properties of the fuel, and it can only be determined with the knowledge of the chemical composition. A measure of the oxidation state is the oxygen chemical potential of the fuel. It can be buffered by redox pairs, such as the well-known Mo/MoO2 pair. In this work, the elemental composition of the fuel is obtained from a burnup calculation and the temperature and pressure calculated with a fuel performance code. An estimate of the oxygen potential of fuel is calculated with Gibbs energy minimization. The results are compared against experimental data from the literature. The significance of the UMoO6 compound and its buffering effect on the oxygen potential is emphasized.

AB - The elemental and chemical composition of nuclear fuel pellets are key factors influencing the material properties of the pellets. The oxidation state of the fuel is one of the most important chemical properties influencing the material properties of the fuel, and it can only be determined with the knowledge of the chemical composition. A measure of the oxidation state is the oxygen chemical potential of the fuel. It can be buffered by redox pairs, such as the well-known Mo/MoO2 pair. In this work, the elemental composition of the fuel is obtained from a burnup calculation and the temperature and pressure calculated with a fuel performance code. An estimate of the oxygen potential of fuel is calculated with Gibbs energy minimization. The results are compared against experimental data from the literature. The significance of the UMoO6 compound and its buffering effect on the oxygen potential is emphasized.

KW - thermochemical modeling

KW - nuclear fuel

KW - oxygen potential

KW - buffering

U2 - 10.1016/j.jnucmat.2016.09.014

DO - 10.1016/j.jnucmat.2016.09.014

M3 - Article

VL - 481

SP - 101

EP - 110

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -