A spent fuel dry storage vessel for a light-water reactor, wherein the spent fuel is stored, wherein the spent fuel is stored and the cooling efficiency of the spent fuel is enhanced and the criticality is excellent, wherein a cask and spent fuel assemblies constituting the outer case are stored, A cooling unit installed on each of the baskets for absorbing and removing residual heat of the spent nuclear fuel, and a cooling unit installed on the lid, And a heat dissipating unit connected to the cooling unit to dissipate the heat conducted from the cooling unit to the outside.
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