There are four second-level subjects under the first-level subject of EAST operation: electric distribution system, water cooling and gas baking system, heating, ventilation and air conditioning system, and comprehensive management of the experimental area of ​​the EAST hall. It is mainly responsible for the electric distribution, water cooling and gas baking, heating, ventilation and air conditioning and main engine Department of Security Management. There is a total of 50 team members, including 5 graduate students.

(1) Electric Distribution System

The EAST Electric Distribution System is mainly responsible for the operation and maintenance of the electric distribution system of the EAST device, which mainly includes a 110kV substation system and the electric distribution. The total capacity of the 110kV substation system is 344.5MVA, the 110kV double-circuit incoming line, and the total transmission capacity of the line is 180MVA; the short-circuit capacity in the station is 1165MVA for Dongpu Line I and 1070MVA for Dongpu Line II. The voltage of the distribution network are 10kV, 0.4kV, 0.22kV, which are mainly used for the cryogenic, vacuum, water cooling, diagnostic, auxiliary heating high-voltage power supply, magnet power supply and other systems of the EAST device.

(2) Water cooling and gas baking system

EAST water cooling and gas baking system includes tokamak water cooling system, component cooling water system and heat rejection system. The tokamak water cooling system consists of an upper divertor water cooling system (Pressure 1.2MPa, Flow 400t/h), a lower divertor water cooling system (Pressure 3.0MPa, Flow 800t/h) and a high-temperature nitrogen baking system (temperature: 350℃). Its operating parameters are currently the highest in the field of magnetic confinement fusion in China; the component cooling water system includes 7 subsystems with a total operating flow at 2000t/h, which mainly provides cooling functions for the EAST subsystems (power supply, heating, cryogenic, vacuum, diagnostic, etc.); The heat rejection system includes two cooling towers and circulation system, with a total capacity of 3000t/h.

(3) Heating, ventilation and air conditioning system

The EAST heating, ventilation and air conditioning system provides a clean, constant temperature and dry environment for the EAST device, auxiliary heating system. It is an important guarantee for the normal operation of the EAST device and an indispensable support system for the EAST device. .It mainly includes 4 air-cooled screw water-cooled units (total cooling capacity: 5200kW; total heating capacity: 4800kW). The refrigerated supply and return water temperature is 7/12℃, and hot water supply and return water temperature is 45/40℃.

(4) Comprehensive management system of the experimental area of ​​the EAST host hall

The comprehensive management system of the experimental area of ​​the EAST main hall is mainly to ensure a good working environment for scientific research staff, create good operating conditions for the operation of the device, and coordinate the management of the instruments and equipment of the experimental area of ​​the main hall (including 8-1 and basement pipelines, etc.).It plays an important guarantee for the EAST device normal operation.