Details

Autor(en) / Beteiligte

• Simanullang, Irwan L.
• Fujimoto, Nozomu

Titel

Preliminary study of a small high-temperature gas-cooled reactor (HTGR) concept with MgO–BeO moderators

Ist Teil von

• Nuclear engineering and design, 2024-04, Vol.420, p.113036, Article 113036

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Quelle

ScienceDirect Pay Per View(PPV) Titles

Beschreibungen/Notizen

• •HTR50S is one of the HTGR concept designs for the small modular reactor for achieving high burnup performance.•Graphite as a moderator and reflector material in the HTGR exhibits microcracking under high-irradiation conditions during the operational period of the reactor.•Investigate the feasibility of MgO–BeO as the new composite-based moderator in the HTR50S.•The high-burnup of 80 GWd/t could be achieved. Furthermore, there is a potential to design a more compact HTGR using the MgO-BeO moderator. Graphite plays a crucial role as a moderator and reflector in high-temperature gas-cooled reactors (HTGRs). However, under high-irradiation conditions, graphite exhibits microcracking within the operational period. Studies have been investigated the potential of composite-based materials for replacing graphite in HTGRs. This study focused on a magnesium oxide (MgO)-based composite material as the host matrix and a homogeneously distributed beryllium oxide (BeO) as the entrained moderating phase and investigated the feasibility of the MgO–BeO as the new moderator in a small HTGR to achieve high burnup performance. In this study, the conceptual design of the HTR50S was selected as one of the candidates for the small HTGR concept. Burnup calculations and safety evaluation in HTR50S design were performed. The Monte Carlo MVP 3.0 and MVP-BURN codes were used in this study for neutronic calculations. Results revealed that a high burnup of 80 GWd/t can be achieved using a fuel composition of 6 kg heavy metal per fuel block with 17 wt% of 235U enrichment. Furthermore, a negative temperature coefficient of reactivity was achieved during the operation period.