Evaluation of the neutronic performance of a fast traveling wave reactor in the Th-U fuel cycle

The possibility for all of the uranium or thorium fuel to be used nearly in full is expected in traveling wave reactors. A traveling wave reactor core with a fast neutron spectrum in a thorium-uranium cycle has been numerically simulated. The reactor core is shaped as a rectangular prism with a seed...

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Bibliographic Details
Published in:Nuclear energy and technology 2020-06, Vol.6 (2), p.77-82
Main Authors: Pomysukhina, Alina Ye, Sukharev, Yury P., Vlasichev, German N.
Format: Article
Language:English
Subjects:
Density dependence
Fast neutrons
Fissionable materials
Fuel consumption
Fuel cycles
Mathematical analysis
Neutron spectra
Nuclear fuel burnup
Nuclear fuels
Nuclear reactors
Nuclides
Raw materials
Reactor cores
Reactors
Solitary waves
Thorium
Traveling waves
Uranium
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Summary:The possibility for all of the uranium or thorium fuel to be used nearly in full is expected in traveling wave reactors. A traveling wave reactor core with a fast neutron spectrum in a thorium-uranium cycle has been numerically simulated. The reactor core is shaped as a rectangular prism with a seed region arranged at one of its ends for the neutron fission wave formation. High-enriched uranium metal is used as the seed region fuel. Calculated power density dependences and concentrations of the nuclides involved with the transformation chain along the core at a number of time points have been obtained. The results were graphically processed for the clear demonstration of the neutron fission wave occurrence and transmission in the reactor. The obtained power density dependence represents a soliton (solitary wave) featuring a distinct time repeatability. Neutron spectra and fission densities are shown at the initial time point, when no wave has yet formed, and at the time of its formation. The wave rate has been calculated based on which the reactor life was estimated. The fuel burn-up has been estimated the ultra-high value of which makes the proposed reactor concept hard to implement. The burn-up of most of both the raw material and the fissile material it produces indicates a high potential efficiency of the developed reactor concept in terms of fuel utilization and nuclear nonproliferation.
ISSN:2452-3038
2452-3038
DOI:10.3897/nucet.6.54629