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[en] A Micro Modular Reactor (MMR) using Supercritical-CO_2 (S-CO_2) as coolant has been investigated from the neutronics perspective. The MMR is designed to be transportable so it can reach the remote areas. The thermal power of the reactor is 36.2 M Wth. The size of the active core is limited to 1.2 m length and 93.16 cm width. The size of whole core is 2.8 m length and 166.9 cm width. The reactor lifetime design target is 20 years. To maximize the fuel volume fraction in the core, high density uranium nitride UN"1"5 was used. The PbO/MgO reflector was also utilized to improve the neutron economy. The S-CO_2 is chosen as the coolant because it offers a higher thermal efficiency. In this study, neutronics calculations and depletion using McCARD Monte Carlo code has been done to determine the lifetime and behavior of the core. Several important safety parameters such as Control Rod worth, Doppler reactivity coefficients and coolant void reactivity coefficient have also been analyzed. (author)
Source
Tsinghua University, Institute of Nuclear and New Energy Technology (INET), Beijing (China); China Huaneng, Shandong Shidao Bay Nuclear Power, Co., Ltd., Beijing (China); Chinergy Co., Ltd., Beijing (China); vp; ISBN 978-7-89395-349-1; 
; 2014; 5 p; HTR2014: 7. International Topical Meeting on High Temperature Reactor Technology; Weihai (China); 27-31 Oct 2014; HTR2014--51272; GRANT 2013M2A8A1041526; Country of input: International Atomic Energy Agency (IAEA); 8 refs., 11 figs., 2 tabs.
; 2014; 5 p; HTR2014: 7. International Topical Meeting on High Temperature Reactor Technology; Weihai (China); 27-31 Oct 2014; HTR2014--51272; GRANT 2013M2A8A1041526; Country of input: International Atomic Energy Agency (IAEA); 8 refs., 11 figs., 2 tabs.