B5-Z.

According to the naming rules, the codes and letters used to identify nuclear power plants are composed of: first, a capital letter, representing the country or region where the nuclear power plant is located, such as China's nuclear power plant starting with B; second, a number or character, representing the number of the city or region where the nuclear power plant is located

;The last is one or more letters, representing the name of the nuclear power plant or project code, etc. Therefore, the name of the CGN value chief should be "B5-Z", where B represents China, 5 represents Hunan Province, and Z is the site name or project

code name.