NEUTRONIC ANALYSIS OF REACTOR CORE SHAPE AND H/D RATIO ON MOLTEN SALT FAST REACTOR (MSFR) WITH 5 MW – 50 MW THERMAL POWER

• Main Author: Suci Lestari, Dini
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/58178
• Institution: Institut Teknologi Bandung

The annual report from the United Nations (UN) which states that in 2019, carbon dioxide emissions related to the world's energy supply increased to 33.3 Gt, or about 45% from 2000. For this reason, new energy sources are needed that can meet electricity needs and do not produce greenhouse gases. One solution to this problem is to use nuclear energy as a source of energy. However, many problems arise from the development of conventional nuclear reactors. Many existing power plants are aging, and construction of new nuclear power is plagued by substantial delays as well as enormous cost overruns. Currently, many countries are developing small modular reactors (SMR), namely nuclear reactors with small power and size and can be easily moved. With a cheaper construction price, this reactor can be used as an answer to the increasing demand for electricity in rural areas and the need for energy supply for sub-marine ships. Small reactor design calculations have been carried out using the European Molten Salt Fast Reactor (MSFR) as a reference because MSFR has a simpler design than MSR. Variations were made to the reactor output power, namely 50MW, 30MW, 20MW, and 5MW. The most effective size for 50MW has a core radius of 28.8 cm and a core height of 57.6 cm with H/D=0.9. For an output power of 30MW, it has a core radius of 25.16 cm and a core height of 41.87 cm, H/D=0.9. For a power of 20 MW, the effective radius is 21.98 cm and the core height is 39.56 cm, H/D=0.9. Then for the 5MW power, the radius is 13.85 cm, and the core height is 24.92 cm, H/D=0.9. In the second calculation, which is varying the size of the fuel and the composition of the fuel to reach a critical reactor state, it is obtained for a critical 50 MWth output power at a composition of 85.5% + ThF4 10.5% + U233F4 4%. With a radius of 44.13cm and a ratio of H/D=0.9. For a reactor with an output power of 30 MWth, the critical fuel composition is 85.5% + ThF4 10.5% + U233F4 5%, with a radius of 37.9 cm and a ratio of H/D=0.9. Key words: Doppler effect, conversion ratio, non-proliferation, reactivity, multiplication factor