Safety considerations for cryogenic hydrogen circulation system in China spallation neutron source phase II project.

Cryogenic hydrogen circulation system is a critical infrastructure of the China Spallation Neutron Source phase II project. Safety considerations related to hydrogen are paramount for the stable operation of the system. This study focuses on the cryogenic hydrogen circulation system within the context of the China Spallation Neutron Source phase II project and conducts a detailed investigation of hydrogen safety issues throughout the process. The operational modes and fault occurrence mitigation strategies of the cryogenic hydrogen circulation system are analyzed and discussed. Additionally, employing centralized layout, zoning management, and multiple barrier layers as guiding concepts for hydrogen safety design, the study addresses physical and interlocking control designs concerning hydrogen distribution, hydrogen venting, vacuum, hydrogen circulation pressure control, and hydrogen leakage. Drawing upon the successful experiences of the first-phase project, the hydrogen safety design of the cryogenic hydrogen circulation system in the China Spallation Neutron Source phase II project provides valuable insights for the development and optimization of hydrogen safety designs across various industrial domains. • Cryogenic hydrogen circulation system of CSNS-Ⅱ is introduced. • Principles and concepts of hydrogen safety in CSNS-Ⅱ are elucidated. • Operational modes and fault analysis of hydrogen circulation system are presented. • Physical and interlock control designs of hydrogen-related system are illustrated. [ABSTRACT FROM AUTHOR]