Abstract

In this study, the dynamic characteristics of accelerator-driven subcritical reactor (ADSR) under beam transients with high heterogeneity of neutron flux in time-space are investigated. Multi-mode core few-group constants are generated by three kinds of neutron fluxes: steady state of ADSR, λ-eigenvalue fundamental wave, and α-eigenvalue fundamental wave. The proposed few-group constants overcome the limitation of single few-group constant generated by two-step method that cannot consider the variation in neutron flux density and neutron energy spectrum with time and space. Compared to the existing few-group constants generated by two-step method under different operating conditions, the self-adapting multi-mode core few-group constants exhibit higher accuracy in the case of following two modes: steady-state mode of ADSR in the starting process and λ-eigenvalue mode in the beam trip condition. Overall, this research provides useful insights on neutron kinetics and can boost the development of ADSRs.

Highlights

  • With the increasing utilization of nuclear power, the disposal of accumulated nuclear waste has become a critical issue globally

  • To overcome the limitations of the existing models, in this study, the multi-mode core few-group constants with beam transients and time-space heterogeneity were generated by three kinds of neutron fluxes: steady state of accelerator-driven subcritical reactor (ADSR), fundamental wave with eigenvalue λ, and fundamental wave with eigenvalue α

  • The multi-mode core few-group constants of ADSR with beam transients and time-space heterogeneity of neutron flux were generated by three kinds of neutron fluxes: steady state of ADSR, λ-eigenvalue fundamental wave, and α-eigenvalue fundamental wave

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Summary

INTRODUCTION

With the increasing utilization of nuclear power, the disposal of accumulated nuclear waste has become a critical issue globally. To overcome the limitations of the existing models, in this study, the multi-mode core few-group constants with beam transients and time-space heterogeneity were generated by three kinds of neutron fluxes: steady state of ADSR, fundamental wave with eigenvalue λ, and fundamental wave with eigenvalue α. The three modes: λ mode, prompt α mode, and fixed source mode, of few-group constants obtained above are linked and correspond to the quasi-static core diffusion code for neutron kinetics of under beam transients This helps in establishing a method for the analysis of neutron kinetics of ADSR with self-adapting multi-mode core few-group constants for arbitrary beam transient conditions. We discuss the results of neutron kinetics obtained using multi-mode core few-group constants and IQS methods under various sub-criticalities, locations, and beam transient conditions. By comparing the relative errors of neutron kinetics results at various positions, it can be inferred that the relative error of multi-mode s_λ is the smallest under the beam transient conditions

CONCLUSION
DATA AVAILABILITY STATEMENT
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