[J5] Non-classical particle transport with angular-dependent path-length distributions. II: Application to pebble bed reactor cores

Journal article

Richard Vasques, Edward W. Larsen
Annals of Nuclear Energy, vol. 70(-), 2014, pp. 301-311

DOI: 10.1016/j.anucene.2013.12.020

Cite

APA Click to copy
Vasques, R., & Larsen, E. W. (2014). [J5] Non-classical particle transport with angular-dependent path-length distributions. II: Application to pebble bed reactor cores. Annals of Nuclear Energy, 70(-), 301–311. https://doi.org/10.1016/j.anucene.2013.12.020

Chicago/Turabian Click to copy
Vasques, Richard, and Edward W. Larsen. “[J5] Non-Classical Particle Transport with Angular-Dependent Path-Length Distributions. II: Application to Pebble Bed Reactor Cores.” Annals of Nuclear Energy 70, no. - (2014): 301–311.

MLA Click to copy
Vasques, Richard, and Edward W. Larsen. “[J5] Non-Classical Particle Transport with Angular-Dependent Path-Length Distributions. II: Application to Pebble Bed Reactor Cores.” Annals of Nuclear Energy, vol. 70, no. -, 2014, pp. 301–11, doi:10.1016/j.anucene.2013.12.020.

BibTeX Click to copy

@article{richard2014a,
  title = {[J5] Non-classical particle transport with angular-dependent path-length distributions. II: Application to pebble bed reactor cores},
  year = {2014},
  issue = {-},
  journal = {Annals of Nuclear Energy},
  pages = {301-311},
  volume = {70},
  doi = {10.1016/j.anucene.2013.12.020},
  author = {Vasques, Richard and Larsen, Edward W.}
}

ABSTRACT: We describe an analysis of neutron transport in the interior of model pebble bed reactor (PBR) cores, considering both crystal and random pebble arrangements. Monte Carlo codes were developed for (i) generating random realizations of the model PBR core, and (ii) performing neutron transport inside the crystal and random heterogeneous cores; numerical results are presented for two different choices of material parameters. These numerical results are used to investigate the anisotropic behavior of neutrons in each case and to assess the accuracy of estimates for the diffusion coefficients obtained with the diffusion approximations of different models: the atomic mix model, the Behrens correction, the Lieberoth correction, the generalized linear Boltzmann equation (GLBE), and the new GLBE with angular-dependent path-length distributions. This new theory utilizes a non-classical form of the Boltzmann equation in which the locations of the scattering centers in the system are correlated and the distance-to-collision is not exponentially distributed; this leads to an anisotropic diffusion equation. We show that the results predicted using the new GLBE theory are extremely accurate, correctly identifying the anisotropic diffusion in each case and greatly outperforming the other models for the case of random systems.