China's independent research and development of nuclear power "nerve center" secret
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If the human central system controls all physiological functions of the human body, then the digital instrument control platform (DCS) that guarantees the safe, reliable and stable operation of the nuclear power plant is the "neural center" of the nuclear power plant - it controls more than 260 systems of nuclear power plants, The operation of 10,000 equipments and the processing of various working conditions play an important role in ensuring the safe, reliable and stable operation of nuclear power plants.
In July of this year, China's first nuclear-grade DCS “harmony system†with independent intellectual property rights was formally passed the independent review by the International Atomic Energy Agency (IAEA). According to some insiders, this marks that China's nuclear power equipment manufacturing industry has received "entry tickets" into the international market.
"Nerve center", plus nuclear power plant, DCS, what sounds complicated and mysterious? A few days ago, under the leadership of General Manager Jiang Guojin, the reporter went to Beijing Guangli Nuclear System Engineering Co., Ltd., the main research and development unit of the “Hehe Systemâ€, to try to find the answer.
Change the white coat and anti-static shoe cover, explore the first stop of the "nerve center", is the "brain" of the nuclear power plant - the main control room. In a simulated main control room of 1:1 size with the main control room of Hualong No. 1 nuclear power unit, the reporter saw that the operation information of the system equipment gathered by the “He-ç¦ system†was quietly displayed in dozens of scenes. On the screen, the nuclear power plant operator can achieve full control of the entire power station.
"China is the fourth country to master DCS manufacturing technology after the United States, France and Japan. At present, only CGNPC and Mitsubishi Corporation in the world have the nuclear power DCS supporting capacity from R&D, manufacturing, identification to operation and maintenance services. Jiang Guojin said.
According to reports, the current DCS is mainly divided into two categories, nuclear and non-nuclear. If the operation of the nuclear power plant is regarded as driving on the expressway, the realization of the non-nuclear level requires only the throttle and the gearbox to achieve the "car" start and high-speed stable operation; and the "harmony system" belongs to the nuclear-grade DCS. Mainly used for nuclear power plant safe shutdown and accident handling. In other words, in addition to starting and stable operation, it also needs to face various emergency situations in real time, intelligent response or emergency stop, so as to better control the "vehicle" braking and "body" stability.
How fast is the “Hey System� Look at this set of comparisons - usually the braking time of the car is second, and the "Heavy System" takes only 150 milliseconds from the discovery of the fault to the realization of the shutdown.
As the "guardian" of the safe operation of nuclear power plants, the security level of the "harmony system" is also "space-level" - if the aircraft is equipped with two or more engines to work simultaneously for safety, then in the "harmony system", It is equipped with four such "engines".
"For example, to order the shutdown, our system is equipped with four columns of cabinets to execute, as long as one of them can act, even if the order is executed." Jiang Guojin said.
Jiang Guojin told reporters that in order to ensure the safety of nuclear power plants, nuclear-grade DCS has two important indicators: the refusal rate and the mis-movement rate. The rejection rate requires that the control system cannot refuse to operate once in 10 million operations. The misoperation rate is 50 years to allow no more than one misoperation, and the requirements are extremely high. "It is this continuous redundancy and continuous backup of each other to ensure a 50-year safety period for nuclear power plants," he said.
Into the integrated test shop, people will have a more direct view of DCS: here is the "harmony system" used by the Yangjiang Unit 5 being commissioned - hundreds of cabinets, neatly arranged, It seems to enter the studio of the Hollywood sci-fi movie "Super-Detector" - open any of the cabinet doors, and the boards with different functions "chips" are arranged in order, the size is like the old-fashioned home video tape, and the flashing status lights are also reminded. With us, these boards are accepting and executing various mission instructions.
Jiang Guojin said that the cabinets and boards in front of the cabinet are in the environmental test. The boards, cabinets and cabinets of the "Heavy System" are in a 660 cubic meter thermostat, simulating high temperature conditions of about 60 degrees, and running for 600 hours. The test is also the most severe long-term operation test carried out by the international manufacturers of similar instruments.
As a new face in the international market, another singularity of the “He-Healing System†is “helping people save moneyâ€! According to China Guangdong Nuclear Power Co., compared with other imported equipment, using a "He-Head System", a nuclear power unit can save at least 300 million yuan! In addition, it has broad application prospects in the market, especially in industries with high reliability requirements such as aviation, shipbuilding, high-speed rail and military.
According to reports, the "Hehe System" has been widely used in many new nuclear power projects in China, achieving full coverage from the second generation of nuclear power technology to the fourth generation of nuclear power. In Jiang Guojin's view, China will usher in a new peak in the development of nuclear power. The approval of the construction of new nuclear power units and the digital transformation of old and domestic units in operation will be more and more. For the “harmonic systemâ€, it means a broad Market prospects and huge development opportunities.
In addition, along with the export of China's independent three-generation nuclear power unit “Hualong No.1â€, the pace of “Hehe System†and other independent DCS equipment is also accelerating. “Foreign users are gradually building an understanding of the 'and the ç¦ system'. We recently signed a contract for the supply of protection systems for a research reactor in Algeria, a project based on the 'and ç¦ system', and believe that the day of the 'and ç¦ system' really went abroad. No longer far away." Jiang Guojin said.