Core Viewpoint - The release of the new IEC international standard for nuclear reactor reactivity characteristics and testing methods marks a significant breakthrough for China's nuclear power industry in international standard-setting [1] Group 1: Standard Development - The new standard titled "Nuclear Power Plants - Important Safety Instrumentation - Characteristics and Testing Methods for Nuclear Reactor Reactivity" was initiated and led by the China National Nuclear Power Research and Design Institute [1] - This is the first IEC international standard newly developed by the nuclear power institute, filling a gap in global nuclear industry standards for reactivity measurement [1] Group 2: Technical Significance - The standard addresses the global challenge of inaccurate reactivity measurement and slow judgment, particularly benefiting third-generation and beyond nuclear power technologies [1]