Fig.1-8 Overview of the new STACY and optimization parameters
UO2 fuel rods in the new STACY are supported by lattice plates. The center lattice is loaded with UO2 fuel rods and concrete rods, and the outer lattice is loaded only with UO2 fuel rods to achieve criticality. The interval of the center lattice is arbitrarily adjusted to simulate the neutron-moderation conditions in which the fuel debris is located.
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