Plasma and Fusion Research

Volume 17, 1405103 (2022)

Regular Articles

Design Concept of Supercritical CO2 Gas Cooled Divertors in FFHR Series Fusion Reactors
Shintaro ISHIYAMA, Akio SAGARA1), Hirotaka CHIKARAISHI1) and Nagato YANAGI1)
School of Fundamental Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjyuku-ku, Tokyo 169-8555, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
(Received 20 April 2022 / Accepted 16 September 2022 / Published 2 December 2022)

Abstract

In the FFHR power reactor equipped with a supercritical CO2 gas turbine power generation system, an divertor cooling system is connected to this power generation system [S. Ishiyama et al., Prog. Nucl. Energy 50, No.12-6, 325 (2008) [1]]. In this paper, for the purpose of developing a diverter by supercritical CO2 gas cooling that can cope with a neutron heavy irradiation environment with a heat load of 15 MW/m2 or more, CFD heat transfer flow analysis was carried out for performance evaluation and its design optimization by a structural analysis models of a supercritical CO2 gas cooled divertors. As a result, in the supercritical CO2 gas cooled tungsten mono-block divertors (50 × 50 mm × 5 channel × 5,000 mL) with a flow path length of 5 m or less, the engineering designable range of these advanced diverters having the same cooling performance as the water cooling divertor was clarified, and its practicality is extremely high from the feature that the structural model has an extremely low risk during operation as compared with the water cooled divertor.

Keywords

divertor, super critical CO2 gas turbine, Force Free Helical Reactor (FFHR), bypass control, axial-flow single-shaft design turbine, CFD, heat transfer flow analysis

DOI: 10.1585/pfr.17.1405103

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