Fuel assembly for supercritical water cooled reactor
A fuel assembly and water-cooled reactor technology, applied in the direction of reactor fuel elements, fuel elements, assembly of fuel elements, etc., can solve the problem that the deformation of the cross-shaped control rod drop fuel assembly can not be satisfied at the same time, and achieve enhanced neutron moderation capacity, increased outlet temperature and core thermal efficiency, and reduced flow instability problems
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Embodiment 1
[0030] A fuel assembly with interposed beam-type control rods, such as figure 2 As shown, four subassemblies arranged in a 2×2 manner are included, and a cross-shaped area is formed between the four subassemblies. The improvement of this embodiment is that the cross frame with guide holes 2 at the center positions of the four subassemblies is used to replace figure 1 The guide tube in the cross-shaped control rod constitutes the insertion channel of the cross-shaped control rod, and the water-squeezing effect of the control rod and the guide hole 2 can realize the safe drop of the cross-shaped control rod assembly; through the integrated structural arrangement of the guide hole 2 and the component box 1, it can Improve the structural stability and deformation resistance of fuel assemblies.
Embodiment 2
[0032] A fuel assembly for inserting beam-type control rods. On the basis of Embodiment 1, this embodiment optimizes the structure of the guide hole 2: the cross-section of the guide hole 2 is circular or square, and the aperture ratio of the lower section is The upper aperture is small.
[0033] In this embodiment, the hydraulic buffering effect of the guide hole 2 and the control rods is further increased through the water squeezing effect of the reduced hole diameter, and the impact force caused by the falling rods of the control rod assembly on the fuel assembly is reduced.
Embodiment 3
[0035] A fuel assembly in which bundled rod type control rods are inserted. On the basis of any of the above embodiments, water rod boxes 4 are also provided, and the water rod boxes 4 are evenly distributed in the assembly box 1 . In this embodiment, the neutron moderation capability of the reactor core is enhanced by evenly arranging the water rod boxes 4, which solves the problem of insufficient neutron moderation in the supercritical water-cooled reactor, and realizes sufficient and uniform moderation of the fuel rods 3 .
[0036] Preferably, each subassembly includes a water stick box 4 and some fuel rods 3 between the water stick box 4 and the assembly box 1; the moderator passage is formed in the water stick box 4, and the water stick box 4 A coolant channel is formed between the component box 1 and the component box 1.
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