Analisis Kritikalitas Model Teras Reaktor Nuklir 200 Mega Watt thermal Berbahan Bakar Lelehan Garam Litium Florida-Berilium Florida-Zirkonium Florida-Uranium Florida menggunakan Monte Carlo N-Particle

RIO RIZKY RAHMADANI, Dr.Ing.Ir. Sihana; Dr. Ir. Andang Widi Harto, M.T.

2021 | Skripsi | S1 TEKNIK NUKLIR

Penelitian ini menggunakan simplifikasi reaktor MSRE berbahan bakar lelehan garam LiF-BeF2-ZrF4-UF4. Tujuan penelitian ini adalah mengetahui (1) pengaruh rasio volume bahan bakar terhadap volume moderator terhadap kritikalitas teras reaktor, (2) pengaruh rasio tinggi-diameter terhadap kritikalitas teras reaktor dan (3) pengaruh pengkayaan terhadap kritikalitas teras reaktor. Metode penelitian ini dilakukan dengan mengubah rasio volume bahan bakar-volume moderator, rasio tinggi-diameter dan pengkayaan U-235 sebanyak masing-masing 21 variasi. Variasi tersebut kemudian disimulasikan dalam software MCNP, sehingga diperoleh koefisien kritikalitas. Dari hasil penelitian disimpulkan (1) Rasio volume bahan bakar-volume moderator (x) berpengaruh terhadap kritikalitas (y) reaktor, melalui persamaan kuadratik y =1.154+ 0.3625x -0.5999x2, Koefisien keff mencapai titik puncak pada rasio volume bahan bakar-volume moderator sebesar 0,3021. Pengaruh rasio volume bahan bakar-volume moderator terhadap keff adalah 80,97%. (2) Rasio tinggi-diameter (H/D) (x) berpengaruh terhadap kritikalitas (y) melalui persamaan logaritmik, y = 0,1723ln(x) + 1,174. Pengaruh rasio tinggi-diameter terhadap keff adalah 95,97%. (3) Pengayaan U-235 (x) berpengaruh terhadap kritikalitas (y), melalui persamaan linear y = 14,05x + 1,01. Pengaruh pengayaan U-235 terhadap keff adalah 98%.

This research uses MSRE reactor core simplification with LiF-BeF2-ZrF4-UF4 molten salt fuel. The purpose of this study is to find out (1) the effect of the ratio of the volume of fuel to the volume of the moderator on the criticality of the reactor core, (2) the effect of the height-diameter ratio on the criticality of the reactor core and (3) the effect of enrichment on the criticality of the reactor core. The research is done by changing the ratio of the volume of the fuel-volume moderator, the ratio of height-diameter and enrichment of U-235 with 21 variations each. The variation is then simulated in MCNP software, so that the criticality is obtained. From the results of the study concluded (1) The ratio of the volume of fuel-volume moderator (x) has an effect on the criticality (y) of the reactor, through the quadratic equation y = 1,154+ 0,3625x -0,5999x2, the keff coefficient reaches the optimal point at the ratio of the volume of fuel-volume moderator of 0.3021. The effect of the moderator-fuel volume ratio on keff is 80,97%. (2) The height-diameter ratio (H/D) (x) affects the criticality (y) through the logarithmic equation, y = 0,1723ln(x) + 1,174. The effect of the height-diameter ratio to keff is 95,97%. (3) U-235 enrichment (x) affects the criticality (y), through the linear equation y = 14,05x + 1,01. The effect of the ratio of the volume of fuel to the volume of the moderator on keff is 98%

Kata Kunci : Kritikalitas; Rasio Volume Moderator-Volume Bahan Bakar; Rasio Tinggi-Diameter; Pengayaan U-235