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Energies 2015, 8(12), 13938-13952; doi:10.3390/en81212405

A Conceptual Study of a Supercritical CO2-Cooled Micro Modular Reactor

Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
Author to whom correspondence should be addressed.
Academic Editor: Hiroshi Sekimoto
Received: 18 October 2015 / Revised: 27 November 2015 / Accepted: 30 November 2015 / Published: 9 December 2015
(This article belongs to the Special Issue Sustainable Future of Nuclear Power)
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A neutronics conceptual study of a supercritical CO2-cooled micro modular reactor (MMR) has been performed in this work. The suggested MMR is an extremely compact and truck-transportable nuclear reactor. The thermal power of the MMR is 36.2 MWth and it is designed to have a 20-year lifetime without refueling. A salient feature of the MMR is that all the components including the generator are integrated in a small reactor vessel. For a minimal volume and long lifetime of the MMR core, a fast neutron spectrum is utilized in this work. To enhance neutron economy and maximize the fuel volume fraction in the core, a high-density uranium mono-nitride U15N fuel is used in the fast-spectrum MMR. Unlike the conventional supercritical CO2-cooled fast reactors, a replaceable fixed absorber (RFA) is introduced in a unique way to minimize the excess reactivity and the power peaking factor of the core. For a compact core design, the drum-type control absorber is adopted as the primary reactivity control mechanism. In this study, the neutronics analyses and depletions have been performed by using the continuous energy Monte Carlo Serpent code with the evaluated nuclear data file ENDF/B-VII.1 Library. The MMR core is characterized in view of several important safety parameters such as control system worth, fuel temperature coefficient (FTC) and coolant void reactivity (CVR), etc. In addition, a preliminary thermal-hydraulic analysis has also been performed for the hottest channel of the Korea Advanced Institute of Science and Technology (KAIST) MMR. View Full-Text
Keywords: micro modular reactor (MMR); supercritical CO2 coolant; uranium mono-nitride (UN) fuel; control drum; replaceable fixed absorber (RFA); Serpent micro modular reactor (MMR); supercritical CO2 coolant; uranium mono-nitride (UN) fuel; control drum; replaceable fixed absorber (RFA); Serpent

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, H.; Hartanto, D.; Moon, J.; Kim, Y. A Conceptual Study of a Supercritical CO2-Cooled Micro Modular Reactor. Energies 2015, 8, 13938-13952.

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