Automotive Black Technology Chapter 1155: : Total shutdown!

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When the dangerous situation at the Fukushima Daiichi Nuclear Power Plant was reported to TEPCO, the faces of senior technical staff were not even as calm as those of front-line personnel.

Know your own affairs.

The boiling water reactor power generation structure of the Fukushima Nuclear Power Plant is technically something that should have disappeared in the long river of history. The two power stations currently use single-layer circulating boiling water reactors that are no longer used in the country.

For this kind of light water reactor, in order to save costs, the cooling water is directly introduced into seawater. The safety... is not very promising in the first place. For Japan, an area with frequent earthquakes, it is very unreasonable to use such a structure. When the Fukushima power station was completed, domestic nuclear experts protested to the IAEA, believing that using such a nuclear reaction structure in an area prone to earthquakes and natural disasters like Japan was irresponsible to the people.

Now that something like this has happened, it really echoes the old saying that it is one's own fault.

One characteristic of nuclear reactors is that the core still needs to be cooled after shutdown.

This is because nuclear fuel has residual heat from self-decay. Although it is much smaller than the heat generated by controlled fission, if it is not cooled for a long time, the core will reach a temperature of thousands of degrees.

Such a temperature will undoubtedly cause the nuclear fuel rods to melt and burn through the outer protective steel shell, concrete and other structures, causing a nuclear leak.

However, after this strong earthquake, the external power grid of Japan's Fukushima Daiichi Nuclear Power Plant was completely paralyzed. Its own emergency diesel generators were all lost due to the tsunami attack after one hour of operation, which resulted in the loss of All external power supplies are provided and the core loses its means of forced cooling.

"Mr. Takahashi, what should we do now?" Seeing that the director of TEPCO's technical department, Nagatake Takahashi, was silent, his subordinates asked as anxiously as ants on a hot pot.

"Activate the emergency plan!" Takahashi slammed the pencil on the table and ordered.

Before he finished speaking, a subordinate pushed the door directly in, and a piece of news that made everyone feel panic was shouted from this man's mouth;

"Sorry, due to the tsunami, all six units of the First Nuclear Power Plant and four units of the Second Nuclear Power Plant have been completely shut down!"

Hearing the news, Takahashi slumped down in his chair.

The shutdown means that the situation at the Daiichi Nuclear Power Plant has reached its extreme.

But this is not the most severe situation. In the event of a reactor shutdown, the power required for the working pump of the waste heat cooling system needs to be input from the outside. Under normal circumstances, the power station will prepare multiple external power grid inputs. At the same time, each unit usually has two emergency diesel generators for power supply, and the emergency diesel generators of other units in the same power plant can also be used as backup for each other.

The simultaneous paralysis of the Daiichi and Daiichi nuclear power plants means that the two power stations in Fukushima have lost their mutually intertwined relationship.

With only those emergency diesel generators, no one can guarantee whether the temperature in the reactor can be maintained within safe limits in the event of a complete shutdown.

"Mr. Takahashi! News from the Daiichi Nuclear Power Plant is that most of the emergency generators are currently wading in water, and Unit 1234 is currently unable to activate the emergency plan!"

Takahashi's body slumped imperceptibly: "Then... let the maintenance department of the power station drain the water as soon as possible and start the backup motor! At the same time, urge the external power supply department to restore power as soon as possible!"

Takahashi moved his lips twice, quickly recovered and ordered.

"Hi!"

After receiving the order, the people below immediately started moving. Just as these people were about to leave to convey their message, Takahashi stopped them again.

"Also, report this incident to the local area and ask them to quickly send additional firefighters to the scene and use fire pumps to help the shutdown unit cool down!"

"Hi!"

……

In a short time, the order was transmitted to the nuclear power plant via satellite phone. At this time, more than thirty minutes had passed since the tsunami hit the power station.

In Reactor No. 1 of the Daiichi Nuclear Power Plant, the safety monitoring panel is already covered with mottled red. Several instruments marking the temperature and coolant water level at various locations in the reactor made the emergency maintenance personnel of Reactor No. 1 even more jealous.

"The temperature in the furnace has exceeded the safe limit by 40%!"

"The cooling water level has dropped below the danger line!"

"Quick, quick! Start the backup motor quickly and let the cooling pump work again!"

Even without orders from superiors, the on-site emergency response plan has been activated. However, due to the large amount of seawater brought by the tsunami, the backup motor has been unable to work.

"What? Let us drain the water? What a joke! Baga!"

After receiving the instructions from the top management, the leader of the on-site emergency response team, Hanashanyuan Zhen, cursed angrily.

The location where everyone is located is inside the nuclear reactor. But now, the water outside has not subsided. If it were not for the radiation-proof explosion-proof door of the reactor, the turbid seawater would have poured in long ago.

Under such circumstances, the above command to drain the water and restart the cooling pump motor is simply an impossible task.

"Team leader! The temperature of the reactor core has exceeded 400% of the safe value! What should we do?!"

"Team leader, the coolant water level can no longer cover the fuel rods, and the pipes have fully entered a state of overheating!"

Huashanyuan really heard the bad news coming one after another, and gritted his teeth, "Organize manpower and drain the water!"

"Hi!"

After receiving the order, several people immediately tidied up their radiation protection suits and began to move the drainage equipment.

As the sound of the gasoline generator resounded around the perimeter of the No. 1 reactor, something invisible to people was quietly going on in the No. 1 nuclear reactor.

Inside the reactor, the cladding of the nuclear fuel rods has turned bright red.

This protective case is made of a metal element called zirconium. This metal has a low thermal neutron absorption cross-section. As a nuclear fuel cladding and structural material, it is at the release site of the nuclear fission reaction in the nuclear reactor and the conversion of nuclear energy into thermal energy. It is also the first step in preventing the radioactive fission products of the reactor from escaping outward. barrier.

When nuclear power is used to generate electricity, 20 to 25 tons of metallic zirconium will be consumed per year for each million kilowatts of power generation capacity.

But at this time, the zirconium shell, which had been turned red by the high temperature of the fuel rod, was burning the water vapor in the reactor.

At high temperatures, zirconium will react violently with water vapor.

In Reactor No. 1 at this time, a large amount of water vapor was roasted and reacted by the zirconium shell, decomposing into hydrogen and oxygen.

Experts have already considered this situation when designing the reactor. Therefore, above the No. 1 unit, there is a special air outlet similar to that of a central air conditioner.

This is the gas port of the hydrogen exhaust system.

According to the normal process, when a large amount of hydrogen is produced in the reactor, the hydrogen exhaust system should intervene at this time.

But above the No. 1 reactor, the hydrogen discharge port that was originally a tight fit was now crooked. Obviously, after being affected by earthquakes, tsunami impacts, and high temperatures, the hydrogen exhaust system has completely failed!

"Chi,"

"Chi,,,"

As the temperature of the zirconium shell gets higher and higher, more and more white steam in the reactor turns into two extremely flammable gases.

At this time, the Fukushima Prefecture Fire Brigade, responsible for assisting the reactor in cooling down, arrived.

Not long after, a fire hose was plunged into the reactor. The water that can be said to be a drop in the bucket was spilled and fell on the zirconium shell.

As if the beast felt more food, the red zirconium shell let out a moan of pleasure.