In-house Computer Codes

(High-level radioActive waste Disposal Evaluation Simulator for Near-field evolUtion)

HADESNU

Multiphysics Modeling for Geological Repository

Our in-house platform, HADESNU, is Korea’s first fully open-source THMC-EC (Thermal–Hydraulic–Mechanical–Chemical–Electrochemical) code for geological disposal. Built to simulate realistic repository environments, HADESNU enables coupled analysis of heat transfer, fluid flow, chemical reactions, radionuclide transport, corrosion processes, and radiolysis under realistic repository conditions.

References

Park, Samuel, et al. "Coupled 3D thermal-hydraulic code development for performance assessment of spent nuclear fuel disposal system." Nuclear Engineering and Technology 56.9 (2024): 3950-3960.

Chae, Nakkyu, et al. "Coupled mixed-potential and thermal-hydraulics model for long-term corrosion of copper canisters in deep geological repository." npj Materials Degradation 7.1 (2023): 26.

Park, Samuel, et al. "Thermal-hydraulic analysis of sequential disposal scenarios in a spent nuclear fuel repository." Progress in Nuclear Energy 181 (2025): 105662.

Chae, Nakkyu, et al. "Oxic corrosion model for KAERI Reference disposal system via O2 consumption reactions and mixed-potential theory." npj Materials Degradation 8.1 (2024): 80.

Contributors

Nakkyu Chae, Samuel Park, Pilhyeon Ju, Eunbi Cho, Sungyeol Choi

BOTANI

Multiphysics Modeling of CRUD Growth and Chemistry

A high-fidelity multi-physics FEM code to simulate the growth of porous CRUD (Chalk River Unidentified Deposits) and the boron chemistry and hideout within the deposits by coupling thermal, fluid, transport, chemical, and radiolysis phenomena with MPI parallel computing.

Developed and then delivered to KHNP.

References

Seo, Seungjin, et al. "BOTANI: high-fidelity multiphysics model for boron chemistry in CRUD deposits." Nuclear Engineering and Technology 53.5 (2021): 1676-1685.

Contributors

Seungjin Seo, Sungyeol Choi

(SNU Boron Investigator with CRUD growth)

SNUBIC

1D Fast Scalable Simulator for CRUD Growth and Chemistry

A radial 1D multi-physics modeling can be applied for each section of nuclear fuel rods to simulate the growth of porous CRUD (Chalk River Unidentified Deposits) and the boron chemistry and hideout within the deposits by coupling thermal, fluid, transport, chemical, precipitation, microstructure changes, and radiolysis phenomena with MPI parallel computing. It can be used for calculating CRUD composition and thermal properties.

References

Seo, Seungjin, et al. "Multi-physics simulation of CRUD deposition and lithium meta-borates precipitation in pressurized water reactors." Nuclear Engineering and Technology (2025): 103433.

Seo, Seungjin, et al. "Modeling of deposition and erosion of CRUD on fuel surfaces under sub-cooled nucleate boiling in PWR." Nuclear Engineering and Technology 55.7 (2023): 2591-2603.

Contributors

Seungjin Seo, Sungyeol Choi

(SNU nuclear fuel CYCLe Evaluator)

SNUCYCLE

System Dynamics Code for Nuclear Energy System Analysis

A system dynamics simulation code for nuclear fuel cycle systems to analyze the isotopic mass flow and lifecycle impact of complex combinations of various fuel cycle processes, reactor types, and multiple recycling.

References

Choi, Sungyeol, Hyo On Nam, and Won Il Ko. "Environmental life cycle risk modeling of nuclear waste recycling systems." Energy 112 (2016): 836-851.

Contributors

Sungyeol Choi

(SNU PYrochemical electrorefining model)

SNUPY

Molten Salt Electrolysis Modelbased on Butler Volmer Theory

An electrochemical kinetics model to simulate a multispecies pyrochemical electrorefining process of used nuclear fuel in molten salt with solid and liquid electrodes.

References

Siting, public acceptance, and nuclear security of nuclear facilities

Seo, Seungjin, Sungyeol Choi, and Byung Gi Park. "Transient modeling of spent nuclear fuel electrorefining with liquid metal electrode." Journal of Nuclear Materials 491 (2017): 115-125.

Contributors

Seungjin Seo, Sungyeol Choi