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A 1D model of a Reactor Vessel Auxiliary Cooling System (RVACS) has been developed, and implemented, in the Julia Programming Language. The governing differential equations are presented and explained. The model is benchmarked with the fast reactor dynamics and safety analysis code SAS4A/SASSYS-1, and it is shown that the developed RVACS model agrees well with results calculated by SAS4A. We conclude that both the SAS4A model and our model benefit from a higher axial node count as it leads to convergence between the two models. Suggestions for future development include porting the RVACS model to FORTRAN and adopting it in the BELLA code to enable an expeditious and safety informed design of metal cooled reactors.

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Development and Implementation of an RVACS Module in the BELLA Dynamics Code for Assessment of Station Blackout Events in Metal Cooled Reactors

  • 会议论文

  • 发表日期：

    2026年

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  • Fredrik Dehlin,
  • Alejandría Pérez-Valseca,
  • Janne Wallenius

摘要

A 1D model of a Reactor Vessel Auxiliary Cooling System (RVACS) has been developed, and implemented, in the Julia Programming Language. The governing differential equations are presented and explained. The model is benchmarked with the fast reactor dynamics and safety analysis code SAS4A/SASSYS-1, and it is shown that the developed RVACS model agrees well with results calculated by SAS4A. We conclude that both the SAS4A model and our model benefit from a higher axial node count as it leads to convergence between the two models. Suggestions for future development include porting the RVACS model to FORTRAN and adopting it in the BELLA code to enable an expeditious and safety informed design of metal cooled reactors.