Fuel rod cladding tube, fuel rod and fuel assembly

摘要

The present invention relates to the field of nuclear energy, the manufacture of fuel rods (FR) and fuel assemblies (FA) for reactors using heavy liquid metal coolant (HLMC), and irradiation devices for testing actual FR performance. It can be used in the manufacture of the FR simulator used in the above. The fuel rod cladding of the present invention for a heavy liquid metal cooled reactor is in the form of a tubular element without welds and has helically wound fins disposed on the outer surface of the element. Manufactured from a ferrite-martensitic chromium silicon steel with a minimum ferrite grain size of 7 according to GOST5639, each fin having an opening angle between 22 and 40 ° (preferably 30 to 40 °) The cross-section of the trapezoid has a trapezoidal shape, the top of the trapezoid has rounded corners, and the base of the trapezoid has smooth corners. Further disclosed are a fuel rod including the above-described cladding tube and a fuel assembly. The technical result of the present invention is to improve the performance characteristics of fuel rods and fuel assemblies due to the long-term durability of cladding tubes in heavy liquid metal coolant environments such as lead or eutectic lead-bismuth. [Selection] Figure 1