On March 6, 2023, the international standard "Reactor Technology-Nuclear Fusion Reactor-Nuclear Fusion Reactor High-temperature Hot Helium Leak Detection Method for Pressure-Containing Components" (ISO 4233: 2023) was officially released. Its preparation was organized by the CNNC, led by the Southwest Institute of Physics of CNNC, and participated by the Institute of Nuclear Industry Standardization of China Nuclear Strategic Planning Research Institute. This standard is not only China's first international standard in the field of nuclear fusion, but also the first international standard in the field of nuclear fusion issued by ISO. The issuance of the standard has effectively enhanced China's influence in the international nuclear fusion field, helps fill in the gaps of ISO standards in nuclear fusion, and created a new situation in the international fusion standardization work. (Source: CNNC)