NOZZLE TYPE MIXING GRID OF NUCLEAR FUEL ASSEMBLY

摘要

PURPOSE: A double plate nozzle-type lattice for supporting a coolant and a fuel assembly in a nuclear reactor is provided to increase a heat transmission from a fuel rod to the coolant by crossing the stream of coolant within the fuel assembly. CONSTITUTION: The double plate nozzle-type lattice for supporting a coolant and a fuel assembly in a nuclear reactor comprises a plurality of lattice plates which are disposed for supporting a fuel rod(25) of a fuel assembly. The lattice plates are disposed in a regular form of lying one lattice plate(15) upon another lattice plate(16) so that a passageway for mixing the coolants is created in the form of it splitting into two pieces or it being united into one. A high temperature of coolant and a low temperature of coolant are mixed in the passageway so that the thermal efficiency increases significantly. The area of outlet is smaller than that of inlet in the passageway for mixing the coolants.