A new fission matrix correction method to estimate the source distribution in nuclear reactor core

Donghao He, William J. Walters

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Monte Carlo method has been widely used in nuclear reactor physics. However, the traditional Monte Carlo method suffers from slow convergence and statistical uncertainty, usually leading to a long computation time. The fission matrix acceleration method has been proposed to accelerate the traditional Monte Carlo criticality calculations, however, it still requires significant computational resources to build fission matrices. A new approach, used in the RAPID code, utilizes a fission matrix combination method to estimate the true fission matrix by combining a set of pre-calculated fission matrix coefficients. Except for the Monte Carlo calculation of the pre-calculated fission matrices, the combination does not rely on the Monte Carlo simulation and saves a large amount of computational costs for subsequent calculations. However, the fission matrix combination method can have significant errors in estimating the source distribution especially with a large enrichment gap between fuels. In this paper, we will explain the issues of the fission matrix combination method in source distribution calculations and present a new method to correct the combined fission matrices. The method is tested on a model with two different enrichment assemblies to calculate both the multiplication factor and the source distribution. The source distribution derived from the corrected fission matrix shows a good agreement compared to the reference, which is the Serpent calculation.

Original languageEnglish (US)
Title of host publicationInternational Conference on Physics of Reactors, PHYSOR 2018
Subtitle of host publicationReactor Physics Paving the Way Towards More Efficient Systems
PublisherSociedad Nuclear Mexicana, A.C.
Pages2042-2053
Number of pages12
ISBN (Electronic)9781713808510
StatePublished - 2018
Event2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018 - Cancun, Mexico
Duration: Apr 22 2018Apr 26 2018

Publication series

NameInternational Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems
VolumePart F168384-3

Conference

Conference2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018
Country/TerritoryMexico
CityCancun
Period4/22/184/26/18

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Nuclear and High Energy Physics
  • Radiation
  • Safety, Risk, Reliability and Quality

Fingerprint

Dive into the research topics of 'A new fission matrix correction method to estimate the source distribution in nuclear reactor core'. Together they form a unique fingerprint.

Cite this