Oxygen potential measurement of (U,Pu,Am)O2±x and (U,Pu,Am,Np)O2±x

Hirooka, Shun; Matsumoto, T.; Kato, Masato; Sunaoshi, Takeo; Uno, Hiroki; Yamada, Tadahisa

doi:10.1016/j.jnucmat.2020.152424

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…The thermal conductivity 𝜆 of actinide oxides decreases with temperature and then turns upward at temperatures higher than 1500 K. These changes can be explained by the contributions of phonon conduction 𝜆 p and electrical conduction 𝜆 e , respectively, as shown by Equation (14).…”

Section: Defect Equilibria In (U Np Pu and Am)omentioning

confidence: 98%

“…We measured the experimental data using the same method. (A) U 0.623 Pu 0.35 Am 0.027 O 2 , 14 (B) U 0.553 Pu 0.285 Am 0.015 Np 0.147 O 2 , 14 (C) U 0.688 Pu 0.29 Am 0.012 Np 0.01 O 2 , 33 (D) U 0.88 Pu 0.12 O 2 , 31 (E) U 0.8 Pu 0.2 O 2 , 34 (F) U 0.7 Pu 0.3 O 2 , 33 (G) PuO 2 , 35 (H) U 0.55 Pu 0.44 O 2 , 32 (I) U 0.3 Pu 0.7 O 2 , 32 and (J) U 0.55 Pu 0.3 Am 0.15 O 2 15…”

Section: Defect Equilibria In (U Np Pu and Am)o2mentioning

confidence: 99%

“…MA-bearing MOX fuels have been developed to reduce the volume of high-level radioactive waste and the degree of toxicity related to the burning of MA elements. Hirooka et al 14 measured the oxygen potential of U 0.623 Pu 0.35 Am 0.027 O 2 and U 0.553 Pu 0.285 Am 0.015 Np 0.147 O 2 . Moreover, the effect of Am and Np on the oxygen potential was expressed as 2.25-and 0.5-fold effects of Pu content, respectively.…”

Section: Defect Equilibria In (U Np Pu and Am)omentioning

confidence: 99%

“…We measured the experimental data using the same method. (A) U 0.623 Pu 0.35 Am 0.027 O 2 , 14 40 related to MOX fuel pins. The improved model was applied to the performance code CEPTAR 8,9 and used for analyzing the initial fuel behavior of MOX and MA-bearing MOX fuels.…”

Section: Introductionmentioning

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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Section: Defect Equilibria In (U Np Pu and Am)omentioning

confidence: 98%