The Fukushima nuclear crisis reminds many people of the Chernobyl nuclear crisis of 1986, but the Fukushima nuclear crisis is different from the Chernobyl nuclear crisis. According to the international classification of the severity of nuclear accidents, the Fukushima crisis was classified as level 4, while the Chernobyl nuclear crisis was classified as level 7.
The French side set the Fukushima nuclear crisis at level 6.
The Fukushima nuclear crisis has risen to level 7.
There is radioactive material leakage in Fukushima nuclear power plant, which has certain harm to human body, but the damage is not as big as nuclear explosion; The Chernobyl nuclear accident was an explosion inside the pressure vessel, which caused more than 8 tons of strong radiation to leak and 3.2 million people were polluted by nuclear. This is a major accident. Some experts said that the Chernobyl nuclear crisis affected the whole Eurasia, and the impact on China was greater than that on Fukushima nuclear crisis. With the changes in the situation of nuclear power plants in Japan, neighboring countries are also extremely concerned. China has started nuclear safety monitoring devices in coastal cities to monitor whether the Japanese nuclear power leakage will affect China.
The World Meteorological Organization and the Beijing Regional Environmental Emergency Center of the International Atomic Energy Agency organized a special discussion and analysis. It is concluded that the wind direction in the middle and lower layers of central and northern Japan has changed from southwest wind to northwest wind, and the upper atmosphere is dominated by west wind. Affected by it, from June 16 to June 19, radioactive pollutants produced by Japan's nuclear leakage mainly affected the central, northern and eastern parts of Japan's North Pacific. China is located in the west of Japan, upstream of the westerlies system, separated by the Sea of Japan, the Korean Peninsula, the Yellow Sea and the East China Sea. Therefore, the diffusion area of nuclear pollutants is far from China.
At the same time, according to the current wind and wave forecast analysis, the current along the eastern coast of Japan is east-northeast and dominated by waves. According to the structure of ocean circulation, the nuclear leakage materials from Fukushima Daiichi nuclear power plant will be transported to the northeast through Kuroshio extension and enter the North Pacific Ocean, but will not spread to China waters in the near future.
Radioactive pollution from nuclear power plants in Japan threatens water and food safety.
The range of radioactive pollution of tap water, raw milk and vegetables in various parts of Japan continued to expand on the 23rd. On the same day, Prime Minister Naoto Kan first asked people not to eat certain kinds of vegetables produced in Fukushima Prefecture. Radioactive pollution from nuclear power plants threatens water and food safety and begins to affect people's lives. The Ministry of Education, Culture, Sports, Science and Technology announced on the 23rd that tap water samples collected from 43 of 47 prefectures in China on the 22nd were found to contain radioactive substances in tap water in 12 areas including Tokyo. In addition, the tap water in Fukushima Prefecture was still found to contain radioactive substances in separate tests, and the tap water in Japan 13 area was confirmed to contain radioactive substances.
In a local water purification plant in Tokyo, the iodine radioactivity per liter of water reaches 265,438+00 becquerel, which is about twice the allowable limit of Japanese infants. On the same day, Tokyo asked parents to avoid letting their babies drink local tap water, and decided to distribute a total of 240,000 bottles of bottled water to families with babies.
Many restaurants in Tokyo have begun to inform customers that the tap water content exceeds the standard, and some supermarkets and convenience stores in Tokyo even have short-term shortages because consumers buy bottled water in large quantities.
The Ministry of Education, Culture, Sports, Science and Technology 2 1 detected radioactive iodine in tap water in Tokyo. However, for adults, the radioactive activity of iodine per liter of water exceeds 300 becquerel, which is considered excessive and inedible.
On the same day, the Ministry of Education, Culture, Sports, Science and Technology of Japan also announced the problem of radioactive substances exceeding the standard in the soil of Dining Village in Fukushima Prefecture. The restaurant is located about 40 kilometers northwest of Fukushima Daiichi nuclear power plant. On the 20th, the soil collected was tested, and it was found that the iodine radioactivity per kilogram was as high as11.7000 Bekkerel, and the cesium radioactivity also reached1.63000 Bekkerel.
According to the data collected by the Ministry of Education, Culture, Sports, Science and Technology on the 23rd, the radiation dose in Chiba Prefecture and Tokyo increased continuously from 17 on the 22nd to 17 on the 23rd, in which Tokyo was 0. 155 microsieverts per hour and Chiba Prefecture was 0. 125 microsieverts per hour, which was about three days ago when the situation was relatively stable. However, most radiation doses in Northeast China and other counties in kanto region are still gradually decreasing.
The pollution range of agricultural and livestock products such as vegetables and raw milk in the surrounding areas of Fukushima Prefecture also showed an expanding trend on the 23rd. Because 1 1 vegetables produced in Fukushima Prefecture were found to have exceeded the standard of radioactive substances, Naoto Kan asked people not to eat all leafy vegetables such as spinach and cabbage, as well as broccoli and cauliflower produced in Fukushima Prefecture.
"Food restriction" is a measure based on Japan's Atomic Energy Disaster Special Measures Act. It is reported that this is the first time Japan has taken this measure. At the same time, Naoto Kan also asked six counties near Fukushima Prefecture, including Miyagi, Yamagata and Nagano, to strengthen the inspection of agricultural products, and the inspection scope was extended to onion, leek, edamame and other varieties.
According to the Ministry of Health, Labor and Welfare on the 23rd, radioactive substances in raw milk produced in Ibaraki Prefecture exceeded the standard. In this regard, Naoto Kan asked the relevant departments not to let the raw milk and coriander produced in the county go on the market that morning.
Other countries and regions have also strengthened the inspection of agricultural products imported from Japan, and even stopped importing some foods from Japan. The US Food and Drug Administration announced on the 22nd local time that it would suspend the import of milk, dairy products and fresh fruits and vegetables from Fukushima and other areas affected by nuclear radiation. Other foods such as seafood can still enter the American market, but they must pass radiation testing first.
South Korea also said on the same day that it would stop importing food that may be contaminated from Japan. France and other countries and regions indicated that they would continue to strengthen the inspection of food imported from Japan. Regarding the nuclear accident caused by the earthquake in Japan, Liu Yunxiu, a senior engineer of Tianjin Earthquake Administration, said that Japan's objective geographical conditions were a factor leading to the nuclear crisis. Japan is located in an earthquake fault zone, and it is dangerous to use nuclear energy at the same time.
At present, China has strict technical regulations on the site selection of nuclear power plants, which will be investigated from the geological structure. If the site is located in a place with low geological activity and does not meet the construction conditions, the one-vote veto system shall be implemented. Drawing lessons from the Japanese nuclear crisis, China's future nuclear power plant construction should be more conservative and safe, away from geological fault zones. At the same time, in terms of seismic standards and flood control standards, there should be higher fortification and supporting inspection mechanisms.