A Reliability Analysis of CFETR CSMC Heat Treatment System Based on RPN-HAZOP Method

The safe and reliable operation of the China Fusion Engineering Test Reactor (CFETR) Central Solenoid Model Coil (CSMC) heat treatment system is the basis for the establishment of the CFETR central solenoid, Nb3Sn superconducting coil. The purpose of safety analysis of a heat treatment system is to find out the unreliable factors of the system, analyze the weaknesses of the system, predict the possibility and severity of system failure, and then improve the reliability of the system. The method of combining risk priority number (RPN) with Hazard and operability study (HAZOP) can make up for the deficiency of quantitative information in traditional HAZOP analysis. It is concluded that the fan subsystem is the weakest part of the heat treatment system by means of RPN-HAZOP. The deviation caused by temperature, cleanliness, and impurity gas content will greatly affect the performance of the superconducting coil. The author tries to put forward scientific and reasonable measures according to the principle of giving priority to solving the principal contradiction. Guided by the measures and suggestions, the heat treatment system runs normally, safely, and reliably. The results of the experiment show that all the process indexes meet the requirements of coil heat treatment technology.