Electronic Theses and Dissertation

Penelitian ini menganalisis pengaruh diameter molten salt channel terhadap faktor multiplikasi neutron (k) pada molten salt reactor (msr) menggunakan simulasi pada program openmc dengan pustaka jeff-3.3-hdf5. penelitian ini bertujuan untuk mendesain material, geometri dan setting dari teras reaktor dengan 127 buah assembler sel bahan bakar jenis msr serta menghitung nilai faktor multiplikasi efektif (keff) reaktor terhadap perubahan diameter molten salt channel. hasil penelitian menunjukkan bahwa semakin besar lebar diameter channel maka semakin meningkatkan faktor multiplikasi efektif (keff) secara signifikan. dari jari-jari channel 0,662 cm hingga jari-jari channel 0,862 cm menyebabkan kenaikan keff sebesar 169,1%. nilai keff mulai stabil pada nilai 0,78716 setelah jari-jari channel 0,862 cm. meski demikian, nilai faktor multiplikasi pada percobaan ini masih berada dalam keadaan subkritis (keff < 1), sehingga perlu dilakukan penyesuaian kembali pada desain reaktor atau melakukan penambahan sumber neutron untuk mencapai kondisi kritis. kata kunci: diameter channel, faktor multiplikasi, molten salt reactor (msr), simulasi openmc

This research analyzes the effect of Molten Salt Channel diameter on neutron multiplication factor (k) in Molten Salt Reactor (MSR) using simulation in OpenMC program with JEFF-3.3-HDF5 library. This study aims to design the material, geometry and settings of the reactor terrace with 127 pieces of MSR type fuel cell assemblers and calculate the value of the effective multiplication factor (Keff) of the reactor against changes in the diameter of the molten salt channel. The results show that the larger the width of the channel diameter, the more the effective multiplication factor (Keff) increases significantly. From a channel radius of 0.662 cm to a channel radius of 0.862 cm causes an increase in Keff by 169.1%. The Keff value stabilizes at 0.78716 after a channel radius of 0.862 cm. However, the value of the multiplication factor in this experiment is still in a subcritical state (Keff < 1), so it is necessary to readjust the reactor design or add neutron sources to achieve critical conditions. Keywords: Channel diameter, multiplication factor, Molten Salt Reactor (MSR), OpenMC simulation