The “Hualong One” nuclear power unit is a third-generation nuclear power unit with full independent intellectual property rights, independently developed by China. It fully draws on the valuable experience accumulated in the design, construction, commissioning and operation of nuclear power plants over more than 30 years, and adopts the highest safety requirements of the International Atomic Energy Agency (IAEA) and the latest third-generation technical standards in Europe. With the characteristics of high safety, economy, independence and environmental protection, it has become a national business card for China's nuclear power “going global”, marking China's transformation from a nuclear power technology importer to an exporter. The Hualong One modified nuclear power unit has made a number of improvements on the basis of the original Hualong One, and intelligence is one of the important improvement contents. In terms of the intelligence of the power plant's electrical system, aiming at the problems of traditional nuclear power plants such as insufficient support for operation and maintenance work, low intelligence level, poor fault handling efficiency and non-standard equipment management, the electrical intelligent system has been deeply optimized. The intelligence of Hualong One's electrical system has always been guided by actual needs, making full use of existing digital and intelligent technologies and equipment to meet the requirements of nuclear power plant management improvement and operation and maintenance needs. It adopts a modular architecture, taking into account real-time performance, continuity and cumulative analysis functions, and integrates and interconnects with other digital systems in the power plant to promote the progress of the overall intelligence level of the nuclear power plant.