Thermal Conductivity of PuO<sub>2</sub> as Determined from Thermal Diffusivity Measurements

Lagedrost, J. F.; Askey, D. F.; Storhok, V.W.; Gates, J.E.

doi:10.13182/nt68-a26353

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…Because of this, multiple data are included for comparison in Fig. The data of Lagedrost et al 40 and Gibby et al 41 report significantly lower thermal conductivities for PuO 2 over the entire temperature range investigated here. The data of Cozzo et al 34 are judged to be the most accurate, as sample stoichiometry was confirmed before each measurement for PuO 2 samples of high density.…”

Section: (4) Thermal Conductivitymentioning

confidence: 99%

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

et al. 2014

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The thermal conductivity of stoichiometric CeO2 was determined through measurement of thermal expansion from 313 to 1723 K, thermal diffusivity from 298 to 1473 K, and specific heat capacity from 313 to 1373 K. The thermal conductivity was then calculated as the product of the density, thermal diffusivity, and specific heat capacity. The thermal conductivity was found to obey an (A + BT)−1 relationship with A = 6.776×10−2 m·K·W−1 and B = 2.793 × 10−4 m·W−1. Extrapolations of applied models were made to provide suggested data for the specific heat capacity, thermal diffusivity, and thermal conductivity data up to 1723 K. Results of thermal expansion and heat capacity measurements agreed well with the limited low‐temperature data available in the literature. The thermal conductivity values provided in the current study are significantly higher than the only high‐temperature data located for CeO2. This is attributed to the tendency of CeO2 to rapidly reduce at elevated temperatures given the available partial pressure of O2 in air at ambient pressure. The CeO2 data are compared to literature values for UO2 and PuO2 to evaluate its suitability as a surrogate in nuclear fuel systems where thermal transport is a primary criterion for performance

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Section: (4) Thermal Conductivitymentioning

confidence: 99%

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

et al. 2014

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“…The PuO 2 solid thermal conductivity has been measured in a number of studies [15][16][17]; however, an expression that correlates these data as a function of temperature is unavailable. Also, the PuO 2 thermal conductivity data from these studies were measured at temperatures above 473 K, but we require solid thermal conductivities at temperatures as low as 323 K. Thus, we needed to develop a reliable expression for the temperature dependence of the thermal conductivity to predict the thermal conductivity at lower temperatures.…”

Section: Puo 2 Thermal Conductivitymentioning

confidence: 99%

“…In the PuO 2 thermal conductivity studies [15][16][17], the thermal diffusivity of PuO 2 was measured and the thermal conductivity determined using the definition…”

Section: Puo 2 Thermal Conductivitymentioning

confidence: 99%

“…While Fukushima et al [16] and Gibby [15] used heat capacity values and temperature-dependent densities for PuO 2 , Lagedrost et al [17] estimated the PuO 2 heat capacities from UO 2 values. Since Lagedrost et al [17] provided their raw diffusivity data and new PuO 2 heat capacity values and densities are available from Carbajo et al [18], we recalculated the Lagedrost et al [17] thermal conductivity values to reflect the better known PuO 2 physical property data.…”

Section: Puo 2 Thermal Conductivitymentioning

confidence: 99%

“…Since Lagedrost et al [17] provided their raw diffusivity data and new PuO 2 heat capacity values and densities are available from Carbajo et al [18], we recalculated the Lagedrost et al [17] thermal conductivity values to reflect the better known PuO 2 physical property data. The recalculated thermal conductivity values are 1 to 8 % higher than the reported Lagedrost et al [17] values.…”

Section: Puo 2 Thermal Conductivitymentioning

confidence: 99%

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Effects of pressure on thermal transport in plutonium oxide powder

Bielenberg¹,

Prenger²,

Veirs³

et al. 2006

International Journal of Heat and Mass Transfer

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Radial temperature profiles of plutonium dioxide powder in a cylindrical vessel were measured over a pressure range of 0.055 to 334.4 kPa with two different fill gases, helium and argon. The powder provides a very uniform self-heating medium for analysis. A thermal conductivity model was developed for heat conduction in the fine ceramic powder. Most literature models make limiting assumptions about powder characteristics that do not hold for this material. Despite the powder particles' complex geometry, the proposed model correctly reproduces the powder temperature profiles over the wide pressure range for both fill gases.

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Use of the Bibliography

Chaney¹,

Ramdas²,

Rodríguez³

et al. 1982

Thermophysical Properties Research Literature Retrieval Guide 1900–1980

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Thermal Conductivity of PuO₂ as Determined from Thermal Diffusivity Measurements

Cited by 13 publications

References 6 publications

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

Effects of pressure on thermal transport in plutonium oxide powder

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Thermal Conductivity of PuO2 as Determined from Thermal Diffusivity Measurements

Cited by 13 publications

References 6 publications

An Evaluation of the Thermophysical Properties of Stoichiometric CeO2 in Comparison to UO2 and PuO2

An Evaluation of the Thermophysical Properties of Stoichiometric CeO2 in Comparison to UO2 and PuO2

Effects of pressure on thermal transport in plutonium oxide powder

Use of the Bibliography

Contact Info

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Thermal Conductivity of PuO₂ as Determined from Thermal Diffusivity Measurements

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂