Based on China Supercritical-Water-Cooled Reactor 1000 (CSR1000) research project, this paper introduces the general design research progress and the structure design scheme of the two-pass reactor, of which the key technologies are studied or proposed, including reactor structure material, sealing type, flow distribution, thermal stress analysis and flow-induced vibration response analysis. Basic research methods and solutions are provided, which are meaningful for the engineering practice.

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