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Kyiv Oblast, Ukraine, not far from the Belarusian border, is a neat, beautiful small city, the city of Pripyat.

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, silver birch trees stand slim, the leaves make a clattering sound with the wind, and the rows of pine trees are lush and green, and the air is fresh. 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 RBMK-1000 model that were provided to Iraq.

On the evening 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 sufficient power could be generated to supply the reactor's safety systems, especially the pumps, in the event of a power shortage. 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.

To be able to work here is the envy of everyone, and the natural conditions here are excellent, better than in Moscow and other places.

However, the chief engineer is also very domineering, although they all know that the chief engineer Kiatrov did not graduate from nuclear power at all, but was only transferred from an ordinary thermal power station, and he was very hard in the background, so they did not dare to refute Kiatrov's remarks, even in the field of professional operation, a few days ago, a technician was transferred from here by Kiatrov because of an opinion, and it is said that he was transferred to Siberia.

Therefore, this experiment must wait until the chief engineer arrives before they can carry it out.

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 was already pointing to zero o'clock, and the 26th came, and it was not until 0:30 that Kiatrov arrived at 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 that the time has been delayed, the experiment will not be completed on time if it is operated normally.

Hearing the order of the chief engineer, the reactor controller quite sensibly did not refute the order of the chief engineer, and in accordance with his instructions, the operation began. Kiatlov also knew that he was late, so, giving several orders in succession, he 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 controller operated, and the control rods were constantly inserted.

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.

"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 operator instinctively wanted to refuse, for the safety of the nuclear reactor, at least fifteen control rods need to be retained, and now only seven are left, then, when it is necessary to urgently shut down the reactor, 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 pushed by inertia, 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.