Thermal diffusivity measurement of (U, Pu)O2−x at high temperatures up to 2190K

Morimoto, Kyoichi; Kato, Masato; Ogasawara, Masahiro

doi:10.1016/j.jnucmat.2013.07.048

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Development of nuclear fuel materials and processes requires assessment of numerous properties that govern thermodynamic stability, heat transport, and other factors. Many recent examples exist to demonstrate such efforts to characterize PuO 2 and mixed actinide oxides such as (U,Pu)O 2 . Cerium dioxide has historically been considered as a surrogate due primarily to its 3+ and 4+ valence states, which match the readily accessible oxidation states of Pu .…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical properties of CeO₂

Suzuki

Kato

Sunaoshi³

et al. 2018

J Am Ceram Soc

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The thermal and mechanical properties of cerium dioxide (CeO2) were assessed using a range of experimental techniques. The oxygen potential of CeO2 was measured by the thermogravimetric technique, and a numerical fit for the oxygen potential of CeO2 is derived based on defect chemistry. Mechanical properties of CeO2 were obtained using sound velocity measurement, resonant ultrasound spectroscopy and nanoindentation. The obtained mechanical properties of CeO2 are then used to evaluate the Debye temperature and Grüneisen constant. The heat capacity and thermal conductivity of CeO2 were also calculated using the Debye temperature and the Grüneisen constant. Finally, the thermal conductivity was calculated based upon laser flash analysis measurements performed on pellets fabricated using a range of feedstock purities to resolve discrepancies in the existing literature.

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Section: Introductionmentioning

confidence: 99%

Thermal and mechanical properties of CeO₂

Suzuki

Kato

Sunaoshi³

et al. 2018

J Am Ceram Soc

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“…Morimoto et al. 64 measured thermal diffusivity as a function of O/M ratio. The plotted thermal conductivity was obtained by multiplying the heat capacity and density calculated using the derived model.…”

Section: Evaluation Of Thermal Propertymentioning

confidence: 99%

“…Comparison between the experimental and calculated values of thermal conductivities. (A) U 0.693 Pu 0.3 Am 0.007 O 2 , 67 (B) U 0.67 Pu 0.3 Am 0.03 O 2 , 67 (C) U 0.693 Pu 0.3 Am 0.02 O 2 , 67 (D) U 0.693 Pu 0.3 Am 0.007 O 2 , 67 (E) U 0.678 Pu 0.3 Am 0.022 O 2 , 67 (F) U 0.647 Pu 0.28 Am 0.007 Np 0.059 O 2 , 63 (G) U 0.583 Pu 0.29 Am 0.008 Np 0.119 O 2 , 63 (H) U 0.647 Pu 0.28 Am 0.007 Np 0.059 O 2 , 63 (I) U 0.6826 Pu 0.2944 Am 0.023 O 1.916 , 64,68 (J) U 0592 Pu 0.295 Am 0.022 O 1.946 , 64,68 (K) U 0683 Pu 0.295 Am 0.022 O 1.932 , 64,68 (L) U 0.682 Pu 0.294 Am 0.023 O 1.926 , 64,68 (M) U 0.592 Pu 0.4 Am 0.008 O 2 , 69 (N) U 0.787 Pu 0.2 Am 0.013 O 2 , 69 (O) U 0.55 Pu 0.3 Am 0.15 O 2 , 62 (P) U 0.65 Pu 0.3 Am 0.05 O 2 , 62 (Q) U 0.6 Pu 0.3 Am 0.1 O 2 , 62 and (R) UO 2 67 …”

Section: Evaluation Of Thermal Propertymentioning

confidence: 99%

“…Figure 14 shows the O/M dependence of the thermal conductivity of U 0.698 Pu 0.3 Am 0.002 O 2−x . Morimoto et al 64 measured thermal diffusivity as a function of O/M ratio. The plotted thermal conductivity was obtained by multiplying the heat capacity and density calculated using the derived model.…”

Section: Evaluation Of Thermal Propertymentioning

confidence: 99%

“…Nuclear fuel is developed by repeating sample preparations, physical property measurements, fuel designs, and irradiation tests. Multiple experiments and thus cost can F I G U R E 1 4 Oxygen-to-metal (O/M) ratio dependence of the thermal conductivity of (U 0.7 Pu 0.3 )O 2−x 64.…”

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confidence: 99%

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A science‐based mixed oxide property model for developing advanced oxide nuclear fuels

Kato,

Oki,

Watanabe

et al. 2023

J Am Ceram Soc.

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Herein, a science‐based uranium and plutonium mixed oxide (MOX) property model is derived for determining the properties of MOX fuel and analyzing their performance as functions of Pu content, minor‐actinide content, oxygen‐to‐metal ratio, and temperature. The property model is constructed by evaluating the effect of phonons and electronic defects on the heat capacity and thermal conductivity of MOX fuels. The effect of phonons was evaluated based on experimental datasets related to lattice parameters, thermal expansion, and sound speeds. Moreover, the effect of electronic defects was determined by analyzing oxygen‐potential data based on defect chemistry. Furthermore, the model evaluated the effect of the Bredig transition on the thermal properties of MOX fuel by analyzing the irradiation test results. The derived property model is applied to the performance code to analyze fast reactor fuel pins.

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