Simulation of a gas-cooled fluidized bed nuclear reactor. Part I: mixed oxide fuels

Bryan E. Miles (Corresponding Author), Christopher C. Pain, Jefferson L. M. A. Gomes, Brendan Tollit

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The worldwide use of enriched uranium has resulted over several decades in a stockpile of 238U. Fertile 238U can be converted by nuclear reaction into a transuranic mixture with a fissile content. Fuel which includes a limited proportion of this converted material is already used in some reactors. Use is restricted by the smaller delayed neutron yield and lower negative temperature coefficient of reactivity compared with uranium fuels.

A reactor with an additional stability feedback would make possible an increased use of fuels containing fissile transuranic isotopes. This feedback mechanism is present in a novel conceptual High Temperature Gas Cooled Reactor (HTGR) where the TRISO particles are fluidized by the coolant gas. Spatial and time dependent simulations using the coupled Radiation Transport (RT) and Computational Multiphase Fluid Dynamic (CMFD) code FETCH go some way towards demonstrating this.

FETCH couples together the two Finite Element Method (FEM) based codes EVENT (RT) and FLUIDITY (CMFD). In previous research FETCH has been applied to simulate fluidized bed reactors fuelled with uranium kernel TRISO particles. In this paper the stability of the reactor is investigated using plutonium fuel of various isotopic compositions. The FETCH model suggests that the plutonium fuelled reactor will remain stable for continuous operation. However, the amplitudes of power fluctuations increase compared with those for uranium fuel.

Original languageEnglish
Pages (from-to)999-1013
Number of pages15
JournalAnnals of Nuclear Energy
Volume37
Issue number7
DOIs
Publication statusPublished - Jul 2010

Fingerprint

Mixed oxide fuels
Nuclear reactors
Fluidized beds
Uranium
Gases
Plutonium
Fluid dynamics
Negative temperature coefficient
Feedback
Radiation
High temperature gas reactors
Nuclear reactions
Coolants
Isotopes
Neutrons
Finite element method
Chemical analysis

Keywords

  • fluidized bed reactor
  • coupled radiation transport multiphase fluid dynamics
  • FETCH
  • transient
  • plutonium

Cite this

Simulation of a gas-cooled fluidized bed nuclear reactor. Part I : mixed oxide fuels. / Miles, Bryan E. (Corresponding Author); Pain, Christopher C.; Gomes, Jefferson L. M. A.; Tollit, Brendan.

In: Annals of Nuclear Energy, Vol. 37, No. 7, 07.2010, p. 999-1013.

Research output: Contribution to journalArticle

Miles, Bryan E. ; Pain, Christopher C. ; Gomes, Jefferson L. M. A. ; Tollit, Brendan. / Simulation of a gas-cooled fluidized bed nuclear reactor. Part I : mixed oxide fuels. In: Annals of Nuclear Energy. 2010 ; Vol. 37, No. 7. pp. 999-1013.
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