Accident Analysis of LOCAS for CFETR HCCB-TBM

Abstract

The Chinese helium-cooled ceramic breeder (CH-HCCB) test blanket module (TBM) is designed to be tested in China Fusion Engineering Test Reactor (CFETR), aiming to validate the feasibility of a DEMO fusion reactor with helium-cooled solid tritium breeders. Safety analysis is part of the TBM design process ensuring that the TBM does not adversely affect the safety of CFETR. The transient thermal-hydraulic analysis was performed to testify that TBM and its helium cooling system would not impact the safety of CFETR under both normal and accidental conditions. The latest design of TBM was introduced in the paper, and its transient thermal-hydraulic modeling and analysis were performed using RELAP5/MOD4.0 code. According to the accident sequences of Accident Analysis Specification for TBM, design basis accidents were investigated. The influences of in-vessel LOCA, ex-vessel LOCA were analyzed comprehensively. The results showed that the design of the CH-HCCB TBM would not affect the safety of CFETR, and active or passive measurements should be done to ensure the integrity of TBM under ex-vessel LOCA.