Effect of PyC Thermal Behavior on the Stress of TRISO-Coated Fuel Particles

Rong Li; Bing Liu; Chun He Tang

doi:10.4028/www.scientific.net/KEM.697.852

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Effect of PyC Thermal Behavior on the Stress of TRISO-Coated Fuel Particles
p.852

HomeKey Engineering MaterialsKey Engineering Materials Vol. 697Effect of PyC Thermal Behavior on the Stress of...

Effect of PyC Thermal Behavior on the Stress of TRISO-Coated Fuel Particles

Abstract:

TRISO coated fuel particle is the most important component in HTR fuel, the silicon carbide (SiC) coating layer is regarded as the pressure vessel to contain the fission products. During reactor operation, the inner pressure resulting from fission products and pyrocarbon (PyC) thermal effect will contribute to the failure of TRISO-coated particles. The higher temperature will result in the increasing of inner pressure and PyC thermal expansion, which will then change the stress of SiC layer. Considering the effects of temperature on inner-pressure expansion and elastic strain into the pressure vessel failure model, thermal effects on the stress of TRISO-coated particles were studied with analytical solution. The results indicated that the effects of inner pressure on the particle stresses were increasingly highlighted at the late stage of irradiation. And the increasing temperature caused a slight effect on PyC elastic modulus while elastic strain is unaffected greatly, either. Therefore, CFP stresses remain unchanged basically.

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Periodical:

Key Engineering Materials (Volume 697)

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852-857

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.852

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Online since:

July 2016

Authors:

Rong Li, Bing Liu*, Chun He Tang

Keywords:

Coated Fuel Particle, High-Temperature Gas-Cooled Reactor, Stress Calculation, Thermal Effect

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