Application of double wall heat shrinkable tube in nuclear power plant

- Oct 31, 2019-

China's coal consumption accounts for 70% of the primary energy consumption. A large amount of fossil energy consumption makes China the second largest carbon dioxide emitter in the world. Nuclear energy has outstanding advantages of green, efficient, low-carbon emission and large-scale production. The development of nuclear power is an important option to cope with climate change. The development of nuclear power in China can not only solve the problem of power supply, but also adjust the energy structure and reduce energy consumption. Low carbon emissions. According to the medium and long term development plan for nuclear power (2005-2020) adopted by the national development and Reform Commission in October 2007 [1], by 2020, the installed capacity of China's nuclear power operation will reach 40 million kilowatts; however, by 2010, this goal can no longer meet the needs of social and economic development, and the installed capacity of nuclear power will reach 70-80 million kilowatts. By 2030, the installed capacity of nuclear power will increase. By 200 million kilowatts, it will be increased to 400 million kilowatts by 2050. China has built four nuclear power bases in Qinshan, Zhejiang, Daya Bay, Tianwan, Jiangsu and Lingao, Guangdong, with 13 active nuclear power generating units and 10.8 million kilowatts of installed capacity.

The nuclear power station uses class 1E K1 double wall heat shrinkable tube for the terminal connection of wires and cables in the nuclear island, which not only plays the role of sealing and insulation protection for wires and cables under normal environmental conditions, but also plays the role of sealing and insulation protection for wires and cables under earthquake load, accident environment and after accident. In the past, only Tyco company in the United States was able to provide class 1E K1 double wall heat shrinkable tubes for nuclear power plants in the world. All class 1E K1 heat shrinkable tubes for nuclear power plants in China were imported. Now our own double wall heat shrinkable tubes can also meet relevant standards.

The nuclear power station uses class 1E K1 double wall heat shrinkable pipe structure, which is composed of two layers, the outer layer is heat shrinkable layer, the inner layer is hot melt rubber layer, mainly composed of EPDM and ethylene vinyl acetate copolymer. When in use, the outer layer shrinks with heat and the inner layer melts with heat. Under the action of the outer layer shrinkage force, the inner layer hot melt adhesive will closely bond the protected part with the outer layer to prevent moisture from entering the protected part.