Research reactor is a powerful tool because of its wide contribution, almost to each field of science. It’s considered to be an essential element for advancing research, development and improvement in nuclear industry. The main goal of research reactor is to produce neutrons which are beneficially used for a wide range of applications such as industrial, agricultural, medical, etc. Neutron spectrum impact it uses. Commonly, neutrons with low energy level, up to 0.5 eV, called thermal neutrons where neutrons with intermediate energy level, ranging from 0.5 eV to 0.10 MeV, called epithermal "resonance" neutrons and neutron with high energy level, above 0.10 MeV, called fast neutron. Thermal and epithermal neutrons can be used for a wide range of purposes such as basic irradiation experiments, neutron radiography, radiolysis, neutron activation analysis, low-scale isotope production and etc. Fast neutrons can be used for investigating radiation damages, advance test of materials behavior and large-scale isotope production.