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Global nuclear power plants have entered the "aging" stage

according to foreign media on July 16, the International Atomic Energy Agency (IAEA) recently released the latest report on the safety of global nuclear power plants at the 57th IAEA general assembly

the report points out that 162 of the 437 nuclear reactors currently in operation in the world have a service life of more than 30 years, and another 22 have a service life of more than 40 years, while 80% of the world's nuclear power plants have been in operation for more than 20 years. It is generally believed that the normal operating life of nuclear reactors is 30 to 40 years. The long-term operation and the aging of nuclear reactors have become major challenges for regulators, operators and public utilities in various countries

since the first use of nuclear power for power generation in American experimental breeder reactor 1 (EBR 1) in December 1951, the global nuclear power technology has a history of more than 50 years. When people enjoy the convenience brought by nuclear power, it also creates a lot of bad news. Chernobe in the former Soviet Union is applicable to manufacturers of automobile suspension springs and motorcycle damping springs, or automobile and motorcycle industries, shock absorbers and other enterprises. Accidents such as wentzkell accident in the United Kingdom, Sanli Island accident in the United States and Fukushima nuclear power plant accident in Japan. Scenes of tragedy always alert people to be careful of the double-edged sword of nuclear power

learn lessons and strengthen safety

iaea said that affected by the accident of the Fukushima Daiichi nuclear power plant of Tokyo Electric Power Company in March 2011, most IAEA Member States had begun to carry out safety assessment, namely stress testing, for nuclear power plants in service in various countries in 2012

countries continue to strengthen the safety measures of nuclear reactors in accordance with the latest global nuclear safety standards, and its importance has been proved by the Fukushima nuclear accident. Among them, the regulatory authorities of the United States, Switzerland, Canada and other countries have developed corresponding safety measures for reactor aging

According to the IAEA report, although many aging reactors have caused safety challenges, the overall situation is still relatively optimistic. In 2012, the world made significant progress in strengthening nuclear safety. Judging from the safety index data of 437 nuclear power plants currently in operation, the operation safety of nuclear power plants is still very high

previously, the IAEA issued a draft requiring that old nuclear reactors should meet more stringent safety goals, so as to be similar to the reactor standards designed in the near future or in the future. But there are also concerns that these aging reactors cannot meet this expectation

According to Reuters, although most nuclear power plants have been in operation for a long time, many nuclear power plant operators are still planning, or have expressed the hope that the machinery industry will continue to develop and hope that nuclear power plants can be in extended service. The IAEA also only pointed out that if it plans to operate the nuclear reactor beyond the time limit, it must thoroughly analyze the safety concerns caused by the aging of irreplaceable accessories

the oldest nuclear reactor in Europe, the British weir method No. 1 nuclear reactor, has a service life longer than the original plan by two years. Magnox, the operator of the reactor, said that the wilfah 1 and 2 nuclear reactors built in Wales have been in operation for 40 years, and the energy generated can make two 310 MW Turbines operate. Wilfa 2 nuclear reactor was supposed to be shut down at the end of 2012. The UK Office of nuclear regulation (onr) approved the transfer of nuclear fuel from reactor 2 to reactor 1 and stopped operation on April 25th, 2012. Wilfa 1 nuclear reactor will be in operation until September 2014

ericbesson, French Minister of industry, once said that former President Sarkozy planned to extend the service life of French nuclear power plants to more than 40 years. And it will not be particularly easy to fade in the case of collision. Eric explained that it is more economical to extend the service life of nuclear power plants. On the one hand, the cost of nuclear power is lower than that of wind power and solar power; On the other hand, EDF estimates that the cost of extending the service life of an existing nuclear reactor is between 68860 million euros, while the cost of building a new Areva latest generation reactor is about 5billion euros

the Japanese government plans to limit the reactor life of nuclear power plants to 40 years through legislation, so as to improve the safety level of nuclear power and avoid the inability of nuclear power plants to cope with emergencies due to aging. But the bill still leaves a window for nuclear power reactors to prolong their lives. In contrast to the United States, 40 years after the reactor was put into operation, some reactors are allowed to continue to operate for 20 years on the premise of ensuring that the test is qualified

of the hundreds of existing reactors in the United States, 66 are allowed to continue operating after the age of 40. At present, some nuclear power plant operators in the United States are also lobbying the government to further extend the operating life of nuclear reactors to 80 years, or even 100 years

case analysis

on August 9, 2004, a steam leakage accident occurred at reactor 3 of Meibin nuclear power plant in Fukui Prefecture, central Japan, resulting in 4 deaths and 7 injuries. Although there was no leakage of nuclear radiation, the nuclear power plant accident caused a huge impact in Japan. According to expert analysis, for nuclear power plant operation and power supply, the United States has developed recycled carbon fiber paving materials nbsp; Improving durability and use intensity has a great warning effect on accidents

warning: the safety of aging nuclear reactors cannot be ignored. There are more than 50 nuclear reactors used for power generation in Japan, of which more than one third have been in operation for more than 25 years. The nuclear reactor involved in the accident was put into use in 1976. The water distribution pipe with the leaked steam originally had a pipe wall thickness of 1 cm. After years of corrosion, holes appeared. After the accident, the inspection found that the thickness of the pipe wall around the hole was only 1.4 mm. According to Japanese domestic standards, the thickness less than 4.7 mm must be replaced

based on this, Japanese technology commentator Chun Sakurai believes that the steam leakage of the water distribution pipe in the turbine room of the No. 3 nuclear reactor of the Meibin nuclear power plant is not a sudden accident. He believes that with the aging of equipment, there will be more and more problems in nuclear power plants. After the accident, the safety of aging nuclear reactors will become the focus of attention

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