A new SCWR fuel assembly with two-row fuel rods between the hexagonal moderator channels.

Highlights: [•] We propose a SCWR fuel assembly with two-row fuel rods between the hexagonal moderator channels. [•] The new concept can resolve the contradiction between uniform and sufficient moderation. [•] Structural size and thermal–hydraulic performance are taken account of in the fuel assembly. [•] Larger infinite multiplication factor and smaller local power peaking factor could be obtained. [•] Two two-row hexagonal fuel assembly concepts are proposed for the engineering application. [Copyright &y& Elsevier]