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Burnup computations of online-refueling process for pebble-bed reactors using layer-mixed-shell fuel movement model.

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Summary

This study introduces a new model for simulating online refueling in pebble-bed reactors (PBRs), reducing computational time while accurately predicting fuel burnup. The model achieves target spent fuel burnup, crucial for efficient reactor operation.

Keywords:
Burnup computationsHigh temperature gas-cooled reactors (HTGRs)Once through then out (OTTO) fuel loading scenarioOnline-refuelingPebble-bed reactors (PBRs)

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Area of Science:

  • Nuclear Engineering
  • Computational Physics
  • Reactor Design

Background:

  • Pebble-bed reactors (PBRs) offer efficient online refueling, reducing downtime and increasing fuel burnup.
  • Simulating dynamic fuel movement in PBRs presents significant computational challenges.
  • Accurate modeling is essential for optimizing PBR performance and safety.

Purpose of the Study:

  • To develop a dynamic simulation model for PBR online refueling.
  • To reduce computational time for PBR simulations.
  • To accurately predict fuel burnup characteristics during refueling.

Main Methods:

  • Utilized MCNPX 2.7.0 with the ENDF/B-VII nuclear data library.
  • Developed a layer-mixed-shell fuel movement model within fuel channels.
  • Simulated the once-through-then-out (OTTO) fuel loading scenario for the HTR-10 design.

Main Results:

  • Achieved an equilibrium fuel cycle with stable core characteristics.
  • Reached a discharged burnup of approximately 80 GWd/tHM, meeting HTR-10 design specifications.
  • The model accurately predicted burnup in both radial and axial directions.

Conclusions:

  • The proposed layer-mixed-shell model enhances simulation accuracy for PBR refueling.
  • The model successfully balances computational efficiency with precise prediction of burnup.
  • This approach provides a more realistic simulation of the HTR-10 refueling process.