Plasmachemical synthesis and evaluation of the thermal conductivity of metal-oxide compounds “Molybdenum–uranium dioxide”

2018 ◽  
Author(s):  
Alexandra A. Kotelnikova ◽  
Alexander G. Karengin ◽  
Orlando Mendoza
Keyword(s):  
Thermal Conductivity ◽  
Metal Oxide ◽  
Uranium Dioxide ◽  
Plasmachemical Synthesis

scholarly journals Plasmachemical synthesis and evaluation of the thermal conductivity of metal-oxide compounds for prospective nuclear fuel

2019 ◽  
Vol 1145 ◽  
pp. 012057 ◽  
Author(s):  
I Shamanin ◽  
Alexander Karengin ◽  
I Novoselov ◽  
Alexey Karengin ◽  
E Alyukov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Metal Oxide ◽  
Nuclear Fuel ◽  
Plasmachemical Synthesis

Sintering behavior and thermal conductivity of graphite flakes/uranium dioxide composites

2021 ◽  
pp. 153106
Author(s):  
Yi Zhong ◽  
Zhenliang Yang ◽  
Qiqi Huang ◽  
Zhiyi Wang ◽  
Yun Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Uranium Dioxide ◽  
Sintering Behavior

Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes

2008 ◽  
Vol 92 (2) ◽  
pp. 023110 ◽  
Author(s):  
Jesse Wensel ◽  
Brian Wright ◽  
Dustin Thomas ◽  
Wayne Douglas ◽  
Bert Mannhalter ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Enhanced Thermal Conductivity

The effect of density on the thermal conductivity of uranium dioxide

1969 ◽  
Vol 29 (1) ◽  
pp. 67-81 ◽  
Author(s):  
R.B. Asamoto ◽  
F.L. Anselin ◽  
A.E. Conti
Keyword(s):  
Thermal Conductivity ◽  
Uranium Dioxide

Utilization of Thorium in LWR Fuels Aiming at Thermal Conductivity Improvements

2016 ◽  
Author(s):  
Jan Kubáň ◽  
Radek Škoda
Keyword(s):  
Thermal Conductivity ◽  
Uranium Dioxide ◽  
Nuclear Power ◽  
Fuel Pellet ◽  
Thorium Dioxide ◽  
Heterogeneous Distribution ◽  
Thermal Output ◽  
Homogenous Distribution ◽  
Limiting Parameters ◽  
Almost All

One of the main drawbacks of uranium dioxide, which is used in almost all nuclear power reactors, is its low thermal conductivity. As a consequence, temperature at the center of fuel pellet is relatively high, because heat is poorly conducted away. To reach a higher level of safety, maximal temperature in any fuel pellet is one of the main limiting parameters, which restrict the fuel thermal output. This paper deals with the use of thorium in LWR fuels with the objective of fuel pellet maximal temperature reduction. Research investigating homogenous distribution of thorium dioxide (thoria) in uranium dioxide fuel has already been done and did not lead to considerable thermal conductivity improvements. The aim of this study is to investigate heterogeneous distribution of thorium in commonly used uranium dioxide fuel in the form of uranium and thorium pellets placed together.

scholarly journals In-pile thermal conductivity of uranium dioxide at low burnup

2020 ◽  
Vol 538 ◽  
pp. 152210
Author(s):  
M.N. Cinbiz ◽  
W. Wiesenack ◽  
S. Yagnik ◽  
K.A. Terrani
Keyword(s):  
Thermal Conductivity ◽  
Uranium Dioxide

Thermal Transport in Defective Actinide Oxides

2018 ◽  
Author(s):  
Alex Resnick ◽  
Katherine Mitchell ◽  
Jungkyu Park ◽  
Hannah Maier ◽  
Eduardo B. Farfán ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Oxygen Vacancy ◽  
Uranium Dioxide ◽  
Thermal Transport ◽  
Dynamics Simulation ◽  
Nuclear Fuels ◽  
Plutonium Dioxide ◽  
Vacancy Defects ◽  
Actinide Oxides ◽  
Substitutional Defects

The present study employs a molecular dynamics simulation to explore thermal transport in various oxide nuclear fuels with defects such as uranium oxide and plutonium oxide. In particular, the effect of vacancy and substitutional defects on the thermal transport in actinide oxides are investigated. It is found that the thermal conductivities of these oxide nuclear fuels are significantly reduced by the presence of vacancy defects. In spite of their small size, oxygen vacancy is shown to alter the thermal conductivity of oxide fuels greatly; 0.1% oxygen vacancy reduces the thermal conductivity of plutonium dioxide by more than 10% when the number of unit cell in length is 100. It was shown that the missing of larger atoms alters the thermal conductivity of actinide oxides more significantly. For the case of uranium dioxide, 0.1% uranium vacancies decrease the thermal conductivity by 24.6% while the same concentration of oxygen vacancies decreases the thermal conductivity of uranium dioxide by 19.4%. However, the uranium substitutional defects are shown to have a minimal effect on the thermal conductivity of plutonium dioxide because of the small change in the atomic mass.

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