REACTOR CORE FUEL ASSEMBLY AND REACTOR STRUCTURE

摘要

PROBLEM TO BE SOLVED: To obtain a core fuel assembly where a multitude of fuel pins working as SASS are contained because quicker operation is realized by detecting center temperature of a fuel rod being a heating element in response point of view than a magnetic self actuated shutdown mechanism (SASS) which makes control rods fall by holding the control rods by magnet, takes advantage of that coolant becomes high temperature in the case of core coolant performance degradation accidents and lowers holding force of the magnet, and a reactor structure loading the element. SOLUTION: The core fuel assembly contains ordinary fuel pins and fuel pins with SASS loading and supporting a multitude of fuel pellets on a pellet support plate at the lower end of suspension rods and constituted so as to drop fuel pellets by fusing the suspension rods by abnormal high heat of the fuel pellets are alternatively arranged in an outer tube. The invention includes a reactor structure in which control rod assemblies and safety rod assemblies are dispersed for loading in the group in a certain array by arranging a multitude of the core fuel assembly in a core of gas-cooled reactor. COPYRIGHT: (C)2004,JPO&NCIPI