However, in contrast, some exposed circuits in the nuclear power plant area are much more fragile. The types of exposed electrical lines in nuclear power plants are: cables for generators to transmit power to external power grids; Cables for transmitting power from the external power grid to the nuclear power plant (as shown in the above figure, when the nuclear power plant is in the construction stage and does not generate electricity, the power used depends on the power grid); Fire detection cable on transformer; Power cables for some external fans and so on. In addition to these, most of the equipment cables are either located in the factory building or buried underground. When the typhoon came, bare electrical lines were the first to bear the brunt. The wind force acts on the pylon without sufficient support, which makes the pylon swing and pull back and forth. The light cable was broken and the tower was pulled down, which led to power failure and communication failure of power station equipment. Broken cables hanging on the road are also likely to cause the danger of electric shock to passers-by.
Why not protect the exposed cables as much as possible? First, economic considerations. Take the transmission cable as an example, the length is tens of kilometers, and it is too expensive to build a large number of brackets. The second is the consideration of probability. Take the transmission cable as an example. As everyone in the power industry knows, transmission cables are not as fragile as imagined. A few centimeters thick black rubber, covered with solid copper wire the thickness of several fingers, has considerable mechanical strength. It is not an exaggeration to call it "black and hard", and the strong wind above level 6 will have a significant impact on it. The magnitude of wind power is negatively related to the probability of occurrence, so the cost of timely prevention and rescue is lower than that of perfect protection of buildings.
The second is afraid of water in the factory. In the terminology of nuclear power plants, there are two main ways to describe the height of buildings such as factories. One is "floor", and the meaning of "one floor and two floors" is the same as "one floor and two floors". The second is the meter number. Generally, the height of a factory building is 3-4 meters on the first floor, 0 meters on the ground, 3.4 meters on the ground and -3.4 meters underground, and so on (I use the data of our factory). In addition to the influence of wind, the impact of typhoon on the factory building is mainly water inflow, especially for the factory building with doors and windows below 0 meters, and rainwater can easily enter through doors and windows. Most of the workshops of nuclear power plants are used to lay live equipment (electrical cabinets, motors, batteries, etc.). ). Rainwater is easy to wet live equipment, reducing the insulation level of live equipment, causing leakage or electric shock accidents. As for the radioactive area you are most concerned about, I will simply reply, nuclear! Anti! Should! Heap! Factory! Room! Don't! Open it! Windows! Yes! Ah! This is just a dead thick cement cone. Electrical cabinets in the factory building. It can be said that the rain was basically caught as soon as it came in.
Third, I am afraid of blowing people away. This is a typhoon that completely opened my brain and blew people away. I've been working in the nuclear power plant for 4 years and I haven't touched it. I'm glad you are happy. . .
Next, let's talk about how nuclear power plants respond to typhoons.
The first is management. Get typhoon forecast information from the meteorological department, and inform all departments to do typhoon prevention work by mail throughout the company (very bureaucratic, I understand).
Next is the technical level. To deal with the possibility of power lines being blown off, it is mainly to make early warning, keep in touch with the power grid and power emergency repair before the typhoon comes, pay close attention to the power supply situation in the factory, and prepare for emergency repair immediately once the cable is blown loose and broken. If there is a problem with the outgoing transmission line, the nuclear island and the conventional island can be turned into isolated island operation (I am not sure about this, please point out); If there is a problem with the inward transmission line, emergency diesel generators can be used to supplement the power. Different electrical cabinets with the same voltage level have redundancy at the beginning of design, and the cable through temporary link can be used as backup power supply. This design is good, that is, when the theoretical knowledge is to be tested, the relationship between this pile of electrical equipment can be dead. ) Orz) the signal line is damaged, which is mainly repaired by the manufacturer.
The way to deal with the problem of water inflow in the factory building is even more stupid and primitive. Two or three days before the typhoon, waterproof canvas was hung on the window and sandbags were piled on the threshold. It's that simple.
But! The most important thing is this but! Under the sun, there is nothing new in state-owned enterprises, and the business of state-owned enterprises is the business of management. "Who will hang waterproof canvas and pile sandbags" is the most annoying. In a popular phrase, it is "the contractor is responsible for the delivery of commercial housing, and the owner is responsible after delivery". Nuclear power plants are also large industrial buildings in essence, and it is understandable to follow this principle. When the workshop is not finished, the contractor is responsible for typhoon prevention. After the workshop was completed and handed over to the owner, the typhoon prevention work fell on the poor brother who ran in the front line. If you want to travel around the factory that may be affected by the typhoon, count how many sandbags and tarpaulins you need and get in touch with materials, you will inevitably experience the feeling of a flood-fighting officer. Yes, I moved sandbags. I also argued with a leader whether sandbags should be moved by operators or contractors, and later I learned that he was a vice president. . . . That was two years ago.
Deal with the problem of people being blown away. . . Are you sure you want me to answer this question because it's all in my head?