NEUTRONIC ANALYSIS OF GAS-COOLED FAST REACTOR WITH TITANIUM BASED ALLOY AS CLADDING, REFLECTOR, AND SHIELDING

Azlan, Muhammad Aidil (2025) NEUTRONIC ANALYSIS OF GAS-COOLED FAST REACTOR WITH TITANIUM BASED ALLOY AS CLADDING, REFLECTOR, AND SHIELDING. S1 thesis, Universitas Andalas.

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Abstract

The Gas-Cooled Fast Reactor (GFR) is one of the Gen-IV reactors that uses gas as a coolant and has no moderator, resulting in fast neutrons and extreme conditions. These conditions cause GFR to use materials that can withstand these conditions are required, one of which is a titanium-based alloy, namely Ti-V-Cr-Nb-Ta. This alloy was chosen because it has high temperature resistance, radiation resistance, and a high melting point. This study uses the Monte Carlo method with OpenMC, which is capable of analyzing complex models with accurate prediction results. Ti-V-Cr-Nb-Ta was tested on three components: cladding, reflector, and shielding, with two composition variations, namely Ti20-V20-Cr20-Nb20-Ta20 and Ti25-V25-Cr5-Nb20-Ta25. The results show that when Ti20-V20-Cr20-Nb20-Ta20 and Ti25-V25-Cr5-Nb20-Ta25 are applied as cladding, keff GFR decreases around 21%, respectively, with almost the same neutron leakage, which is 0.0055. The absorption rate is higher than the initial model, which is around 100 times more. When both materials were used as reflectors, the GFR keff decreases to 8% and leakage decrease to 97% compare to initial model, with scattering rate increases 12% than the initial model, and the neutron flux was at high energy. When Ti20-V20-Cr20-Nb20-Ta20 and Ti25-V25-Cr5-Nb20-Ta25 are used as shielding, keff of GFR only falls 0.3% without neutron leakage, although the absorption rate is lower than the base model, with a similar neutron energy spectrum. From this research, it is concluded that Ti-V-Cr-Nb-Ta as shielding. Moreover it could also be applied as reflector and cladding with some optimalisation

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