### Abstract

he use of homogenised multi-group cross sections to speed up Monte Carlo calculation has been studied to some extent, but the method is not widely implemented in modern calculation codes. This paper presents a calculation scheme in which homogenised material parameters are generated using the PSG continuous-energy Monte Carlo reactor physics code and used by MORA, a new full-core Monte Carlo code entirely based on homogenisation. The theory of homogenisation and its implementation in the Monte Carlo method are briefly introduced. The PSG-MORA calculation scheme is put to practice in two fundamentally different test cases: a small sodium-cooled fast reactor (JOYO) and a large PWR core. It is shown that the homogenisation results in a dramatic increase in efficiency. The results are in a reasonably good agreement with reference PSG and MCNP5 calculations, although fission source convergence becomes a problem in the PWR test case.

Original language | English |
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Title of host publication | International Conference on the Physics of Reactors 2008 (PHYSOR 08) |

Editors | Rakesh Chawla, Vinh N. Dang, Konstantin Mikityuk |

Publisher | Paul Scherrer Institut |

Pages | 679-686 |

Number of pages | 8 |

Volume | 1 |

ISBN (Electronic) | 978-3-9521409-5-6 |

ISBN (Print) | 978-1-61782-121-9 |

Publication status | Published - 2008 |

MoE publication type | A4 Article in a conference publication |

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## Cite this

Leppänen, J. (2008). On the feasibility of a homogenised multi-group Monte Carlo method in reactor analysis. In R. Chawla, V. N. Dang, & K. Mikityuk (Eds.),

*International Conference on the Physics of Reactors 2008 (PHYSOR 08)*(Vol. 1, pp. 679-686). Paul Scherrer Institut.