The secret technology of the United States has been conquered by China for half a century.

In the construction of ships, nuclear power and military industry, there is an indispensable & ldquo; small parts & rdquo; called seals. Especially for large-scale nuclear power plants, it is a key component of nuclear safety equipment, is an important safeguard against radioactive material leakage. It is such a small seal, monopolized by American companies for more than half a century, and in order to be able to also own China's own seals, a team has been working hard. In the workshop of a private enterprise in Ningbo, Zhejiang Province, the chief engineer kept his eyes on the four-meter diameter metal ring that was about to go off the line. Although the metal ring looks ordinary, it is an essential C seal ring for nuclear power plant reactors. It is with this private enterprise of less than 100 people that Li Xinggen has made China the second country in the world to produce C-rings through painstaking research and development, breaking the monopoly of foreign countries for half a century. To inspire him to take on this mission, we should begin with a bid competition with the United States ten years ago at the Qinshan nuclear power plant. In a bid held in July 2007, Ningbo Natural Seals Co., Ltd. won the bid by 20 points higher than the United States, but the United States did not provide “ C-ring & rdquo; threatened to change the winning bidding results. None of China's companies could produce a nuclear seal ring at that time, and if the United States threatened to refuse to supply it, it would have been a fatal blow to China's nuclear power plants. Unfortunately, the Qinshan nuclear power plant had to decide to buy the gasket products of Chinese and American companies at the same time. Hearing the news, his heart was deeply hurt, and he responded quickly. Li Xinggen, Senior Engineer of Ningbo Natural Seals Co., Ltd.: Let me assure you that I will conquer this seal ring in five years. I said that I will conquer it when I run out of money. The pressure vessel of nuclear fuel placed in the nuclear reactor is more than 4 meters in diameter. The vessel is divided into two parts: the cylinder and the end cover. The joint surface is sealed by two metal seals. When the reactor is in working state, the nuclear fuel inside the vessel produces high pressure and high temperature, and the joint surface of the vessel cover and the cylinder will produce a separation trend. At this time, the metal seal ring with memory function will rebound to compensate for the separation, thus realizing the sealing function and preventing nuclear leakage. The manufacturing process of metal seal rings has been secret for half a century in the United States. The painful experience has also been the driving force for Rigen and his research team to challenge the sealing ring technology, which has been blocked for more than half a century, from scratch. In the upstairs factory building, the C type seal ring with a diameter of four meters has just been completed. The workers are making final proofs of its shape. Li Xinggen said that when the first nuclear seal ring was born in the Chinese company, the entire domestic nuclear power plant industry was shocked. Li Xinggen: Because the original foreign words, thunder can not move 15% every year to raise prices, there is no room to negotiate with you, the time will be decided by them, when he does not know, he now listen to our domestic production, is also very excited. On December 3, 2015, China's first domestic metal type C seal ring was installed on the reactor pressure vessel of Qinshan nuclear power plant Fangjiashan No. 1 unit. In September 18, 2016, it entered the refueling shutdown and checked after service. Success or failure is here. Under the witness of a group of experts from the State Energy Administration and China Nuclear Power Organization, the reactor pressure vessel of Fangjiashan unit in Qinshan Nuclear Power Station was slowly opened. After a period of use, the domestic metal C-ring seal ring had no damage to the inner and outer rings, the sealing line was uniform and coherent, and there was no wrinkle or protrusion. 6 hours later, the expert group announced that it was in line with the safety standards of nuclear power plants. Li Qi finally relieved himself. Li Xinggen: I have done two things in my life, one is pipeline seal, the other is pressure vessel seal. I have spent more than 30 years. Li Xinggen has been awarded the second prize for new sealing technology, new products and application of national science and technology for more than 30 years. This innovation has broken the monopoly of foreign countries and reduced the prices of similar foreign products by 70%. At present, 70% of the equipments in Guangdong Nuclear Power Base, Lianyungang Nuclear Power Base and Qinshan Nuclear Power Base are made of domestic seals.