Uncertainty & sensitivity analysis of TH-MOX fuel in ABWRS

Una Davies, Eugene Shwageraus, Cheuk Wall Lau

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Thorium-plutonium mixed oxide fuel has been of interest for a number of years as a method of plutonium disposition, in particular due to its suitability for use in light water reactors operating today. A barrier to its use is the as yet unknown effect of the larger uncertainties present in thorium nuclear data libraries when compared to more traditional fuels. Uncertainty and sensitivity analysis is performed for Th-MOX fuel in an ABWR fuel assembly in order to quantify how these higher input uncertainties affect output uncertainties in the operating parameters generated by neutronic codes. Two separate methods of uncertainty analysis are compared: a Total Monte Carlo method involving a large number of sampled data libraries to repeat the same calculation many times using W1MS, and a perturbation theory-based approach using the covariance matrices of the input nuclear data along with sensitivity coefficients generated by Serpent. The uncertainty in the Th-MOX fuel results is consistently found to be significantly greater than in either of the two reference fuels considered. The sensitivity analysis identifies the five nuclide crosssections that the effective multiplication factor is most sensitive to, and the second part of the uncertainty analysis pinpoints which of these provides the greatest contribution to this output uncertainty.

Original languageEnglish
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.
Pages249-259
Number of pages11
ISBN (Electronic)9781713808510
StatePublished - 1 Jan 2018
Externally publishedYes
Event2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018 - Cancun, Mexico
Duration: 22 Apr 201826 Apr 2018

Publication series

NameInternational Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems
VolumePart F168384-1

Conference

Conference2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018
Country/TerritoryMexico
CityCancun
Period22/04/1826/04/18

Keywords

  • Sensitivity analysis
  • Serpent
  • Thorium
  • Total Monte Carlo
  • Uncertainly quantification
  • WIMS

ASJC Scopus subject areas

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

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