Movie black technology

As we all know, the principle of a fission reactor is to bombard nuclear fuel such as uranium or plutonium with neutrons. After the nuclei of these materials absorb neutrons, they will split into two or more smaller nuclei, and at the same time two to three nuclei will be released. A neutron and a great energy, and then these released neutrons will bombard other nuclei, causing them to continue to split and release energy, and so on, endlessly.

To put it simply, after a neutron hits an atomic nucleus, it is directly smashed to pieces, and then falls apart, but the system technology is different. A large amount of energy, and then like a domino, one divided into two, two divided into four, and four divided into eight without breaking, which is commonly known as a chain reaction, and a large amount of energy is continuously released during the chain reaction...

The control of the chain reaction in nuclear fuel is the biggest difference between a nuclear bomb and a nuclear power plant.

After lighting the fire and causing a chain reaction, ignore it, and say "annoying" while running, it is called a nuclear bomb. Only those that strictly control the occurrence rate of the chain reaction and guide the use of thermal energy to generate electricity can be called nuclear power plants, while This control is generally achieved through the control rod.

The so-called control rod is simply a stick made of neutron-absorbing material that compensates, adjusts or stops the nuclear reactor.

Generally, they can be divided into compensation rods, regulating rods, and safety rods, which are used to compensate fuel consumption, adjust the reaction rate, and terminate the operation of the reactor.

These three kinds of control rods are connected with mechanical devices and inserted between the cores, surrounded by nuclear fuel, as long as the distance between them and the bottom of the core is adjusted, they can play a role.

For example, when it is necessary to increase the power of the reactor, it is only necessary to lift the adjusting rod out of the core, the absorption of neutrons in the core decreases, the number of neutrons participating in the chain reaction increases, and more energy is released.

The same is true for reducing the power, as long as it is inserted deep into the core, the number of neutrons between the fuel rods will be absorbed more, and the chain reaction will naturally slow down.

To put it bluntly, it is like the gate of a hydroelectric power station. The higher the gate is, the more neutrons will flow out of the water, and the chain reaction will be more intense. The lower the gate, the more water will be intercepted naturally.

The safety rod can be said to be the dragon-breaking stone of the reservoir. As long as it falls, the water in the reservoir will be completely intercepted.

Take the Tibetan Antelope nuclear reactor as an example. When a failure or accident occurs, the safety rod in the Tibetan Antelope reactor will be inserted directly into the bottom of the core within 0.3 seconds.

At this time, the safety rod will absorb most of the neutrons, reducing the number of neutrons in the reactor to the point where it can no longer cause a chain reaction.

In this way, the reactor will naturally stop.

Moreover, the Tibetan Antelope also has a collision warning function. When the AI ​​finds that it may encounter a collision or the hull has been damaged through radar and cameras, it will automatically shut down and switch to emergency energy use.

The spacecraft in the movie automatically stopped the operation of the reactor the moment the protagonist detonated the grenade.

With the safety system of the Tibetan Antelope, if there is a nuclear leakage accident, the only possibility is that the core is directly broken down, and the nuclear fuel and the radioactive circuit system are exposed.

Apart from this possibility, there is no other possibility.

However, according to the design indicators, even if the Tibetan Antelope fell directly from the atmosphere, it might not be able to fall into this appearance.

Because its reaction layer outside the reactor, that is, the shell that wraps the entire core of the reactor, is made of super alloy, even if it is dropped directly from space to the ground, it can only be deformed without breaking.

On the control rods, the system uses boron carbide, silver indium cadmium and other materials with strong neutron absorption ability. This is a fairly common material, which is enough to meet the control needs of nuclear reactors.

After Chen Shen heard that the preliminary plan had been designed, he was about to come up with the plan. After looking at it for a while, he didn't see any problems.

At present, various countries, especially domestic ones, are still doing a good job in nuclear safety control. After all, there are enough learning cases abroad, so the design level of control rods is not bad.

Next, Chen Shen checked each system of the nuclear reactor with Zeng Le'an and Qi Long, and flipped through the information on the screen one by one until the last part.

【Thermoelectric materials】

Chen Shen pointed to the four big characters above with a pen, "Has the production work for this part been arranged yet?"

Qi Long replied: "This material does not belong to the production scope of our base, but we have already asked other factories in the system for help, and we should be making arrangements now, and we should be able to produce the first batch of samples in a month. "

"You have to pay attention to it. If there is no such thing, it will be useless for our nuclear reactor to be built."

At this point, the small meeting was almost over. Chen Shen was afraid that they would not want to deal with such matters that had nothing to do with his major, so he reminded the two of them to pay attention to it.

"We used to deal with the internal affairs of nuclear reactors, but nuclear reactors are not enough. No matter how small a nuclear reactor is, it can only emit heat and cannot directly generate electricity."

"Nuclear reactors on the ground or on ships generally use steam to drive turbines to generate electricity, but this device is too large to fit into the Tibetan Antelope, so the only way we can go is thermal power generation, and if we want to achieve thermal power generation, This new thermoelectric material is the only hope."

Following his words, the information on the screen began to flip, and Chen Shen also began to remind them of some matters that needed extra attention.

Temperature difference power generation, to put it bluntly, is a way to directly convert heat energy into electrical energy.

In this way, the direct conversion between electrical energy and thermal energy can be realized through the movement of carriers inside the thermoelectric material.

For example, if a temperature difference is created at both ends of a semiconductor material, there will be more carriers at the hot end and fewer carriers at the cold end, and the potential at both ends will be different. At this time, as long as the two ends are connected with a wire, the current will The side with more carriers will move to the side with fewer carriers, forming a current.

If many pairs of such thermoelectric conversion materials are connected to form a module, a sufficiently high voltage can be obtained to form a thermoelectric generator.

Inside the Tibetan Antelope, such thermoelectric materials are covered under the shell to form a thermoelectric power generation device.

The reactor is connected to the thermoelectric power generation device through the heat pipe, and the heat pipe includes a lead-out section and a return section, and the two sections are connected end to end to form a cycle.

The heat pipe is filled with liquid sodium, and the heat pipe is also equipped with a micro circulation pump. After the liquid sodium in the outlet section passes through the double loop system in the reactor, after the radioactivity is eliminated, it flows to the power generation device to heat the thermoelectric material, and then returns to the section The liquid sodium inside flows back into the reactor from the side of the power generation device, and continues to receive the heat energy generated by the reactor, so the cycle...

It is estimated that there will only be two updates tomorrow, I am guilty...