NONE 20260128122554273 wseas/wseas content-registration-form+ja@crossref.org content-registration-form International Journal of Applied Sciences & Development 2945-0454 Shah Nusrat Jahan Shanta Department of Nuclear Science and Engineering, Military Institute of Science and Technology, Mirpur Cantonment, Dhaka, BANGLADESH Nusrat Zahan Zarin Department of Nuclear Science and Engineering, Military Institute of Science and Technology, Mirpur Cantonment, Dhaka, BANGLADESH Abdus Sattar Mollah Department of Nuclear Science and Engineering, Military Institute of Science and Technology, Mirpur Cantonment, Dhaka, BANGLADESH Bangladesh desires to upgrade its nuclear research capacity by commissioning a 10–20 MW multi-purpose research reactor (MPRR) to be fueled by VVR-KN low-enriched uranium (LEU) fuel in terms of the limitation of its current 3 MW TRIGA Mark-II reactor, specifically in fuel supply issues. In this study, the fuel assembly is solved by applying a fluid–structure interaction (FSI) approach in ANSYS Workbench to analyze coupled thermal, hydraulic and structural responses under steady-state operating conditions. The solution integrates computational fluid dynamics (CFD) with structural mechanics to analyze coolant flow behavior, temperature distribution, pressure drop, energy gains and resulting fuel rod deformations, stress, strain. Comparative analysis is carried out between ANSYS Fluent and ANSYS CFX solvers to verify consistency and accuracy of results. Comparative validation confirms the robustness of FSI framework that accurately predicts thermo-mechanical safety margins of MPRR safety assembly. 01 28 2026 01 28 2026 1 1 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/232029.2026.5.1 https://wseas.com/journals/asd/2026/a02asd-001(2026).pdf IAEA (International Atomic Energy Agency). (2022). Research Reactors: Purpose and Future. 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