Effect of energy deposition modelling in coupled steady state Monte Carlo neutronics/thermal hydraulics calculations

Riku Tuominen, Ville Valtavirta, Manuel García, Diego Ferraro, Jaakko Leppänen

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

In coupled calculations with Monte Carlo neutronics and thermal hydraulics the Monte Carlo code is used to produce a power distribution which in practice means tallying the energy deposition. Usually the energy deposition is estimated by making a simple approximation that energy is deposited only in fission reactions. The goal of this work is to study how the accuracy of energy deposition modelling affects the results of steady state coupled calculations. For this task an internal coupling between Monte Carlo transport code Serpent 2 and subchannel code SUBCHANFLOW is used along with a recently implemented energy deposition treatment of Serpent 2. The new treatment offers four energy deposition modes each of which offers a different combination of accuracy and required computational time. As a test case, a 3D PWR fuel assembly is modelled with different energy deposition modes. The resulting effective multiplication factors are within 30 pcm. Differences of up to 100 K are observed in the fuel temperatures.

Original languageEnglish
Pages (from-to)919-926
Number of pages8
JournalEPJ Web of Conferences
Volume247
DOIs
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Physics of Reactors, PHYSOR 2020: Transition to a Scalable Nuclear Future - Cambridge, United Kingdom
Duration: 28 Mar 20202 Apr 2020

Keywords

  • Energy deposition
  • Monte Carlo
  • Multi-physics
  • Serpent
  • SUBCHANFLOW

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