How is the Fukushima nuclear wastewater produced in Japan?

How is the Fukushima nuclear wastewater produced in Japan?

How is the nuclear waste water produced in Fukushima, Japan? After nuclear wastewater enters the ocean, it will rapidly pollute the world with ocean currents, and enter the land with water circulation. Various isotopes will pollute marine life and eventually affect human beings. The nuclear sewage of Fukushima nuclear power plant is different from that of ordinary nuclear power plants. They are exposed to the molten nuclear fuel in the core, and the radioactive materials inside are extremely complicated.

How did the Fukushima nuclear waste water in Japan come into being 1 Fukushima nuclear waste water, that is, the water with high concentration of radioactive substances produced by the accident at the Fukushima Daiichi nuclear power plant.

Fuel fragments melted and solidified due to the accident remain in the reactor of Fukushima Daiichi nuclear power plant 1-3 unit. In order to keep the fuel fragments cool, water must be continuously sprayed on them. When water comes into contact with fuel fragments, it will produce "polluted water" containing high-concentration radioactive substances (tritium, cesium 134, cesium 137, cobalt 60, etc.). ), that is, nuclear wastewater.

In addition, because the "polluted water" containing this high concentration radioactive substance remains in the reactor building, when it is mixed with groundwater or rainwater flowing into the building, it will also produce new "polluted water".

TEPCO has been using nuclear material removal equipment (ALPS) to purify Fukushima nuclear wastewater, which can reduce the concentration of 62 radioactive materials except tritium in sewage, and the treated water is stored in giant water storage tanks.

The Japanese government said that through this complicated filtration process, most radioactive nuclear materials except tritium were removed; Before being discharged into the sea, the nuclear waste water will be treated for the second time, so as to reduce the amount of radioactive substances other than tritium as much as possible and make it reach the "standard that can be discharged into the environment".

But in fact, the nuclear waste water treated by nuclear material removal equipment still can't ensure the complete removal of radioactive elements.

After 10 years of accumulation, the amount of nuclear pollution water has reached at least 1.25 million tons. If it is discharged, it will waste half of the Pacific Ocean in 57 days and spread to the global waters in 10.

The Japanese side is very confident in the decision to discharge into the sea.

They have two excuses:

First, the treated sewage is very safe; Second, we have no other way.

But is this really credible?

Some experts have analyzed that there are at least many methods to treat these wastewater, such as "evaporation release" and "underground burial".

But they chose the simplest and easiest way, direct launch!

Because for any private enterprise, the nuclear sewage treatment capacity of 6.5438+0.37 million tons must be an astronomical figure. They simply don't want to spend this money, thinking about waiting for the whole world to clean it up for them!

As a result, the Japanese side made a seemingly "satisfactory" decision at this time.

They are clever to the bone and selfish to the bone.

A German research institute simulated the diffusion:

Within 57 days, radioactive materials will spread to most parts of the Pacific Ocean, and three years later, the United States and Canada will be affected by nuclear pollution.

How is the nuclear waste water produced in Fukushima, Japan? In recent days, the most controversial thing in the world is naturally that Japan has discharged nuclear waste water from the Fukushima nuclear power plant into the sea. All aspects of the world are paying attention to this matter. More than one scientific research institution has stood up against it, and many institutions have made many deductions.

After nuclear sewage enters the ocean, it will rapidly pollute the world with ocean currents, and with the water circulation entering the land, various isotopes will pollute marine life and eventually affect human beings.

Japan insists that the nuclear sewage has been treated and passed through their filtration system. At present, the nuclear sewage discharged will only contain tritium, a radioactive element, which has little impact and meets international standards.

However, the problem is that these are all said by the Japanese themselves, and no one is supervising them. Moreover, even if Japan does it now, no one knows whether they can do it in the future, and no one can supervise it. Japan is far from mobilizing itself in this matter, and it is also a referee.

The nuclear sewage of Fukushima nuclear power plant is different from that of ordinary nuclear power plants. They are nuclear fuels that have been exposed to the core meltdown, and the radioactive materials in them are extremely complex. Carbon 14, cobalt 60, strontium 90 and other substances have a very long half-life and great radiation energy, which will pose a great threat to marine ecology.

20 1 1 year, a 9-magnitude earthquake occurred in Japan, causing more than 20,000 deaths and disappearances, and the earthquake also led to a leakage accident at the Fukushima nuclear power plant. In order to deal with this leakage problem, Japan adopted the scheme of introducing seawater to cool the reactor.

After the seawater was polluted, it was stored in some large iron cans at the Fukushima nuclear power plant. At present, there are thousands of tanks, which store 1.25 million tons of nuclear sewage.

Because of geographical restrictions, it is impossible for Japan to make tin cans endlessly. At present, the existing tin cans will be full next year, so Japan has decided to start a new plan, which is to discharge them into the sea.

For many people, there must be such a question. Why has nuclear leakage been 10 years, and nuclear sewage has been produced? Will it never stop in the future?

Many people may wonder why Japan wants to discharge nuclear sewage into the sea. Just keep picking up a few cans and save them. But since Japan doesn't do this, isn't this plan feasible because nuclear sewage will continue?

At present, the Fukushima nuclear power plant will produce 1 10 tons of nuclear sewage every day, much lower than the previous 470 tons. Then, since it has dropped so much, why should Japan be discharged into the Pacific Ocean?

In fact, these nuclear sewage will not be produced permanently. According to Japan's calculation, they will be able to clean up the damaged Fukushima nuclear power plant around 205 1, and no nuclear sewage will be produced at that time.

According to the current calculation of 1 10 tons per day, nearly 40,000 tons of wastewater will be generated in one year, and according to the calculation of 40 years, it will generate10.6 million tons of nuclear sewage in the future. At present, there are more than 1 1,000 iron cans in Fukushima, storing 1.25 million tons of wastewater. In other words, it is not impossible to continue to store these nuclear sewage in iron drums, just continue to expand the area around the nuclear power plant by less than twice.

So what's the problem? Since this scheme is not unsolvable, and Japan has also said that the nuclear sewage has been treated without pollution and meets international standards, and the Japanese Deputy Prime Minister has also said that this water is drinkable, why should Japan rush to discharge it?

Some people say that this is because there is a risk of leakage of iron drums, which will cause secondary pollution. There is a paradox. Now that you say it's been processed and even ready to drink, why are you afraid of leaking it on land and polluting your place in Japan?

Now all sides are against it. To put it bluntly, it is a question of distrust. The first is that no one believes that Japan can filter all complicated nuclear sewage. Since it can be filtered, you Japanese can keep it for yourself. Anyway, your fresh water resources are not rich. The second is that it can be filtered clean at present. Can you promise in the future Third, who will supervise this matter and who will be the referee? It can't be Japan.

The sea is not its own, so dumping garbage into it requires everyone's consent. Japan put forward such a plan without consulting others, and everyone naturally opposed it. In fact, it is not only the international community, but also the people in Japan.

Some people speculate that Japan just thinks that the current treatment plan is too expensive and wants to share it with you, or let you help find a way, so it has come up with the best plan.