FIELD: power engineering; water heating devices including nuclear power plants. SUBSTANCE: proposed fuel assembly characterized in enlarged heat-transfer surface and easy subchannel-to-subchannel displacement has hollow fuel elements whose hollow spaces are connected at inlet and outlet to inlet and outlet chambers, respectively; fuel elements are spaced h distance apart and have holes arranged over their length and used to provide communication between inner spaces of fuel elements and fuel assembly space between fuel elements. EFFECT: enhanced fuel rating and reliability of fuel assembly. 3 cl, 3 dwg
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