APPLICATION OF THE PROBABILITY-BASED SAFETY ANALYSIS FOR THE RELIABILITY EVALUATION OF A SPECIAL FUEL SALT RELEASE SYSTEM DESIGN IN THE MOLTEN SALT REACTOR

摘要

In the molten salt reactor (MSR), the fuel salt can be discharged out of the core to avoid a more serious consequence in the accident. In this paper, a special core fuel salt release system (CFSRS) is described. Its equipment reliability and human reliability are evaluated subsequently to identify the key failure factors and provide suggestions for the design, by means of the fault tree analysis and the human reliability analysis (HRA) respectively. Results show that the human error is a dominant factor of CFSRS failure in the accident scenario. A good operator training or a sufficient diagnosis time can greatly improve the CFSRS human reliability. Regardless of the human error, to obtain a balanced design and a low equipment failure probability of less than 2E-5, the redundant design of CFSRS including the pipe heating subsystem is necessary.