The "International Thermonuclear Experimental Reactor (ITER)" is the second largest international scientific project after the International Space Station, involving seven parties including China, the European Union, India, Japan, South Korea, Russia, and the United States in its construction. Both the complexity and technical difficulty of the project exceeds those of commercially built and operated nuclear fission reactors. In addition, the ITER project is a multinational collaborative scientific endeavor, with installation files involving equipment developed and manufactured by member countries of the ITER organization. This includes the installation of large-sized or heavy components, installation of components under high or ultra-high vacuum, and installation and connection of superconducting components, posing significant technical challenges for contractors. The TAC1 installation section of the project, which has been awarded to China National Nuclear Corporation, is the most important core equipment installation project for the ITER Tokamak device. Its significance is equivalent to the reactor of a nuclear power plant or the heart of a human body, mainly involving the installation of the Dewar structure itself and all auxiliary systems between the Dewar structure and the vacuum vessel. This contract is the largest nuclear energy project that a Chinese enterprise has successfully bid for in the European market to date and marks the first time that the Chinese nuclear energy industry has successfully participated in an international large-scale scientific project in the form of an engineering general contractor. The signing of this contract signifies that the engineering general contracting capabilities formed by China's uninterrupted nuclear power construction over more than 30 years, the accumulation of more than 50 years of nuclear fusion technology, and international influence have been recognized in the high-end nuclear energy market. This article introduces the situation of China's participation in international large-scale scientific programs, taking participation in ITER (the International Thermonuclear Experimental Reactor Program) as a starting point, analyzes the implementation of the TAC-1 installation section project led by China National Nuclear Corporation in collaboration with France, and summarizes the TAC-1 project's pricing model, planning management system, risk management, and safety management, to explore the management lessons from the international project management system for domestic nuclear power plant construction.