Behavior of graphite in nuclear reactor stacks

Klimenkov, V. I.

doi:10.1007/bf01674506

Cited by 5 publications

(2 citation statements)

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“…Graphitic systems are used for a wide variety of industrial applications, ranging from lubricant and refractory materials to neutron moderators in nuclear fission reactors 1 and plasma shields in the next generation of fusion reactors 2,3 . The recent realization of graphene 4 (single graphitic layer) and the discovery of its unusual electronic properties 5,6 have raised the interest on flake graphitic systems as a route to produce graphene samples of high quality and in large scale [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Bending modes, elastic constants and mechanical stability of graphitic systems

Savini

Dappe

Öberg

et al. 2011

Carbon

158

102

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The thermodynamic and mechanical properties of graphitic systems are strongly dependent on the shear elastic constant C44. Using state-of-the-art density functional calculations, we provide the first complete determination of their elastic constants and exfoliation energies. We show that stacking misorientations lead to a severe lowering of C44 of at least one order of magnitude. The lower exfoliation energy and the lower C44 (more bending modes) suggest that flakes with random stacking should be easier to exfoliate than the ones with perfect or rhombohedral stacking. We also predict ultralow friction behaviour in turbostratic graphitic systems. arXiv:1008.3639v1 [cond-mat.mtrl-sci]

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Section: Introductionmentioning

confidence: 99%

Bending modes, elastic constants and mechanical stability of graphitic systems

Savini

Dappe

Öberg

et al. 2011

Carbon

158

102

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“…Contamination of graphite with nuclear materials and fission products occurs during fuel spill incidents. The radioactivity of irradiated graphite is also caused by contamination of the surfaces of graphite products with products of the purge gas activation [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic simulation of radioactive graphite combustion in water vapor

Барбин

Kobelev

Terent’ev

et al. 2022

J. Phys.: Conf. Ser.

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The paper analyzes the gas phase, the behavior uranium, the calculation of thermophysical properties during heating of nuclear reactor graphite containing various actinides. The study was carried out by thermodynamic modeling using the TERRA software package in the range from 423 to 2123 K at a constant pressure of 0.1 MPa. Up to a temperature of 623 K, the main components of the gas phase are water vapor, carbon dioxide, methane and hydrogen. Above 1023 K, the gas phase contains predominantly carbon dioxide and monoxide. It was revealed that in the range of 423-923 K uranium is present in the form of condensed compounds - uranium dioxide and uranyl chloride. Up to a temperature of 1623 K, uranium is present in the form of condensed uranium dioxide and calcium uranate. At temperatures above 2023 K, condensed uranium compounds are converted into gaseous and ionized compounds of uranium trioxide and dioxide. The thermophysical characteristics change unevenly up to a temperature of 923 K.

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