New organic nuclear reactor core assembly design and physical calculation

• 1、School of Energy and Power Engineering, Chongqing University, Chongqing 400044
• 2、Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400044

Abstract：Organic medium can be used as the coolant and moderator for nuclear reactors due to its unique advantages. The design and physical calculations of organic nuclear reactor were carried out in this paper. By investigation and filtering, the heat resistance, corrosion resistance, neutron cross section and other physical chemical parameters of different kinds of organic materials were obtained.The new organic nuclear reactor has been degined which is cooled by Santowax OMP and moderated by graphite . In order to compare with the pressurized water cooled nuclear reactor, the reactor core of 17 × 17 layouts was adopted, and 48 graphite rods whose diameter is 8.43 mm have been chosen as its moderator, which also can be used for flattening the core power. The optimization analysis is done for the layout. Reactor core reactivity and power peak are controlled by 16 burnable poison rods. The calculation results demonstrate that the core design satisfies the inherent safety of the reactor, the distribution of the core power is relatively flat, and the scheme can take full advantage of the organic working fluid. Meanwhile, the cost can be reduced while the power is guaranteed. The results can be used as reference for organic nuclear reactor design.

Keywords： Organic nuclear reactor Physical calculation Core design Power distribution