Air-cooled micro-reactor prismatic fuel assembly fixing mechanism and reactor core

The invention provides an air-cooled micro-reactor prismatic fuel assembly fixing mechanism which comprises a fixing pin and fixing grooves, the fixing grooves are formed in the opposite surfaces of two to-be-fixed radial adjacent fuel assemblies respectively, the fixing pin comprises two clamping strips which are symmetrically arranged, the two clamping strips are connected into a whole, and the clamping strips are arranged in the fixing grooves. The two clamping strips are embedded into the two fixing grooves correspondingly to achieve fixation of the two radial adjacent fuel assemblies, the length of the section of each fixing pin is larger than two times of the depth of the corresponding fixing groove, and therefore a gap exists between the two fixed radial adjacent fuel assemblies. The air-cooled micro-reactor prismatic fuel assembly fixing mechanism disclosed by the invention has good restraining capacity, can adapt to the operating temperature of a reactor, and ensures the integrity and stability of a