Design Optimization of a Prismatic Compact High-Power Molten-Salt Reactor Based on Graphite Lifetime and Fuel Efficiency
Year: 2026
Type: article
Abstract: This study investigates the core optimization of a Prismatic Solid Molten-Salt Reactor (PSMSR) to meet key objectives of compactness, high power density, and extended operational life. With graphite irradiation resistance being a paramount concern in high-flux environments, the analysis focuses on the influence of core height-to-diameter ratio, active zone size, and reflector thickness on the graphite displacement per atom (DPA) distribution and burnup performance. The results indicate an optimal active core configuration characterized by a 1:1 height-to-diameter ratio, a 175 cm active zone radius, and a 55 cm reflector. Building on these findings, reactivity-control strategies were refined. An evaluation of burnable-poison addition against fuel-loading optimization revealed that the latter, by adjusting the TRISO (TRi-structural ISOtropic) packing factor and control-rod dimensions, can meet the safety shutdown margin requirements and substantially improve the fuel utilization efficiency, ultimately achieving a burnup depth of 50.3 MWd/kgU and a 10-year operation lifetime without refueling at a 500 MWt power level. This research provides an effective technical solution for the modular deployment of solid-state molten-salt reactors in remote areas and in special application scenarios. This research offers a viable technical pathway for implementing solid-fueled molten-salt reactors in remote and specialized scenarios, enabling their modular deployment.
Source: Energies
DOI: 10.3390/en19061486
Authors: Fangyuan Zhang, Rui Yan, Ye Dai, Yang Zou
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
OpenAlex ID: W7137929707