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Kyiv Oblast, Ukraine, not far from the Belarusian border, is a neat, beautiful small city, the city of Pripyat. Pen, Fun, Court www.biquge.info{{}}

The town was built in the 70s to house the construction workers and crews of the Chernobyl nuclear power plant.

In the early morning, a touch of golden sunlight penetrates the dense forest, the silver birch trees stand slim, the leaves make a rustling sound with the wind, and the rows of pine trees are lush and green, and the air is fresh, making people linger. When you look up again, you will see a pure and transparent blue sky, dotted with white clouds. This kind of beautiful natural scenery is not found in big cities. Therefore, attracted by the scenery, more and more people come to this small city, and by now, there are more than 50,000 people.

Three kilometers away from the town, among the birch trees, there is a huge building, the pride of the Soviet and Ukrainian peoples, the Chernobyl nuclear power plant.

The plant, consisting of four reactors, each capable of producing 1 gigawatt of electricity, provides 10 percent of Ukraine's electricity. Construction began in the 70s, with reactor No. 1 commissioned in 1977, followed by three more reactors in 1978, 1981 and 1983. There are also two reactors under construction, both of the same type and of the same type of RBMK-1000 that were provided to Iraq. {{}}

On the night of April 25, 1986, it was an ordinary dark night.

Reactor No. 4 was shut down the other day and is ready for scheduled maintenance. It was decided to test the reactor's turbine generator capability at this time to test whether it could generate sufficient power to supply the reactor's safety system in the event of a power shortage. Especially water pumps. This is of great significance when the reactor is attacked, and the reactor can be shut down normally and safely.

"Why hasn't the chief engineer come yet?" A technician in the control room of the No. 4 nuclear reactor complained that they had been waiting for a long time.

"Don't complain, be careful to send you to Siberia to feed the mosquitoes." Another technician said.

> better than Moscow and other places.

However, the chief engineer is also very domineering, although they all know it. Chief Engineer Kiatrov did not graduate from nuclear power at all, he was only transferred from an ordinary thermal power station, and. He was very hard in the background, so they didn't dare to refute Kiatlov's remarks, even in the field of professional cāo, a few days ago, a technician had already been transferred out of this place by Kiatrov because of an opinion, and it was said that he was transferred to Siberia. {{}}

Therefore, this experiment must wait until the chief engineer comes. They will be able to proceed.

In addition to the dozen or so people on the night shift in the control room, there are more than a hundred people working on this No. 4 reactor, all of whom are on the night shift today.

The hour hand is already pointing to zero, and 26ri has arrived. It was not until 0:30 that Kiatrov came to the scene.

"Start experimenting." Kiatlov ordered.

In this experiment, the reactor needs to be operated at a lower power, so that the reactor's energy can be reduced from 3,200 megawatts of normal power to 700 megawatts.

However, now because the time has been delayed, if it is done according to the normal cāo. The experiment could not be completed on time.

Hearing the chief engineer's order, the reactor controller sensibly did not refute the chief engineer's order, and according to his instructions, began to cāo. Kiatlov also knew that he was late, so, several orders in succession, began to rapidly reduce the power of the reactor.

Inside the huge reactor, the power of the nuclear reactor dropped rapidly, soon dropping to 30 megawatts, as the control rods were inserted incessantly as the controller cāo.

Looking at the data displayed on the meter, Kiatrov was very dissatisfied, in this case, before the experiments, the nuclear reactor should be shut down. (First. Hair)

"It is reported that the xenon-135 inside the nuclear reactor is increasing rapidly." A monitor reported.

This is a nuclear fission product in which neutrons are attracted, i.e. the control rod is inserted too quickly, resulting in a rapid increase in this element.

"What's going on?" Kiatrov asked.

This is the sorrow of a layman leading an insider, who doesn't even know how this by-product appeared, but still directs this experiment as chief engineer. {{}}

"Our control rods were inserted too quickly, which led to the rapid generation of this by-product." One technician reported: "In accordance with the safety charter, we now need to shut down the reactor. ”

Down? Kiatlov glanced at the technician with dissatisfaction, if the pile was stopped, what would be done with this experiment? The report on the results of his experiment has already been written, and if this experiment is successful, he will go one step further and be transferred to the China Atomic Energy Agency (CAEA) and upgraded two levels in a row, but now, before the experiment has been carried out, it will be over, so won't this experiment fail? He knew the significance of the experiment, which was a means of proving the emergency response of nuclear power plants in times of war.

On second thought, he saw that the control rods had been inserted too quickly, leading to a by-product claim, and that the power of the reactor was now dropping too quickly, almost one-twentieth of what had been expected.

"So, let's pull out the control rods again, so that the power of our reactor will increase a bit, and at the same time, these xenon-135 will also be reduced to the normal range, right?" Kiatrov said.

"Theoretically, yes." The technician could only stubbornly reply.

Just now the power was reduced, and now the power is rising, and everyone present knows that this is simply a blind command, but they dare not refute it. {{}}

"There are only seven control sticks left, and the rest are all pulled out."

Hearing this order, the nuclear reactor crew instinctively wanted to refuse, for the safety of the nuclear reactor, at least fifteen control rods need to be kept, and now only seven are left, then, when it is necessary to stop the reactor urgently, it will become difficult, but since the chief engineer has spoken, he also consciously complied.

"The power went up to two hundred megawatts." The monitor said.

"Start experimenting." Kiatrov said.

At this time, as if everything was normal, there was no unexpected display on the meter, however, they did not know that, in fact, the nuclear reactor had already begun to have a condition.

At 1:19, the experiment officially began.

The controller turned off the power to the pump, the turbine generator was pushing, the speed of the water flow was reduced, and the pump was restarted.

"It worked!" Kiatelov was very satisfied, and the success of this experiment would allow him to add a heavy stroke to his resume here.

No one knows that the reactor at this time has become very unstable, because the continuous series of cāo operations that exceed the safety regulations increase the steam level of the reactor core, and under normal circumstances, it should be all coolant, that is, liquid water, and this kind of RBMK graphite reactor has a fairly high "cavitation coefficient" in the design, which means that when there is no water, only water vapor, the reduced neutron absorption will increase the power of the reactor rapidly. Now that the remaining control rods are no longer enough to absorb the excess neutrons, cāo operations on the reactor will gradually become unstable and more dangerous.

None of the personnel were clear, they were cheering for the success of the experiment.

The experiment lasted for four minutes, and the plan was successfully completed, which means that the experiment was completed.

At this time, the No. 4 reactor is still under repair, so the experiment has been completed and the reactor needs to be shut down.

At this time, Kiatrov gave one of the orders he regretted most in his life: "Emergency shutdown." ”

The reactor can be shut down normally or urgently, in fact, Kiatrov is in a hurry to go home, and the normal shutdown only delays him for a few minutes, but in normal times, he likes to give the order to stop the reactor urgently.

Cāo operatives pressed the AZ-5, or Rapid Emergency Defense 5 button, and the command was to insert all the control sticks, including the ones that had been removed earlier.

Unbeknownst to them, the Grim Reaper was already beckoning to them, and the countdown had begun, and it was only seven seconds!

Even for an emergency shutdown, the control rods take 18 to 20 seconds to complete, and the difference between the two is that the number of control rods inserted at the same time is different.

With the insertion of the control rods, the hollow part was temporarily displaced, the coolant began to escape, and the reactor, which had already been unstable, suddenly exploded with great enthusiasm, and the reactor power began to increase!

The controller, who was about to leave, glanced at the meter, and suddenly a cold sweat broke out on his face, and he immediately shouted: "Oops, the power of the reactor is increasing dramatically!" ”

Another person also shouted: "The pressure of the reactor has exceeded the upper limit!" ”

Kiatlov's mind went blank in an instant, he knew that if the power exceeds the limit, it means that the core will melt, and the pressure will exceed the limit, which means that the nuclear reactor will explode!

The layman is now aware of this, but there is nothing they can do to save them.

Then they heard a loud explosion.

Three seconds after pressing the emergency shutdown button, the reactor power had already exceeded the prescribed five times, the internal heat began to heat, the pipes of the control rods were deformed, and only a third of the pipes entered the pipe, and they were already stuck, at this time, the reactor was completely out of control.

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