Three Mile Island
Yes, the Three Mile Island nuclear power plant in Pennsylvania experienced a partial core meltdown in 1979, which resulted in the most serious accident in the history of the US commercial nuclear power generating industry. However, the reactor did not explode like a nuclear bomb.
The only one that has ever exploded to my knowledge was at Chernobyl in 1986, and this was due to a steam pressure surge during an experimental procedure that was badly planned and carried out. This type of reactor was unique to the Soviet bloc countries and is no longer built, though I think some may still be in operation.
No, a nuclear reactor would not explode solely due to the absence of people. Reactor safety systems are designed to shut down automatically in case of any abnormal conditions, such as the reactor overheating or losing cooling. The presence or absence of people would not impact the reactor's physical safety mechanisms.
The only incident which might have become a disaster was the Three Mile Island one in 1979. This caused a partial meltdown of the core, and was certainly a commercial disaster, though the effect to the public was minor, if anything.
Short answer: Chernobyl. Physics answer: That heat has to go somewhere and it's not inclined to have a discussion about where. The heat in a fission reactor is generated by the interaction between the fuel (uranium) and the neutrons that are produced by the interaction itself. Basically, the neutrons cause the uranium atoms to break (fission). When the uranium atoms break, they release heat (nice, because we need that for things like generating electricity) and more neutrons (sort of nice, because it feeds itself). But if you don't get the heat out of there, you've got a major problem on your hands. In order to control the heat released by uranium/neutron interactions, to slow them down, nuclear reactors have "control rods" that can absorb neutrons. They're usually made of carbon. If you screw this part up, and there is no coolant, your reactor turns into the scariest heat factory you ever dreamed of. Flooding it with coolant now will result in two things: Steam explosions and radioactive coolant. If a coolant leak is all you get in this scenario, then count yourself lucky. You just avoided a complete reactor melt-down, the equivalent of an atom bomb detonating in your neighborhood.
None ever recorded but I may happen soon. We'll see >:)
Never a nuclear reactor is used in airplanes. However, it is used in submarines.
Yes, the Three Mile Island nuclear power plant in Pennsylvania experienced a partial core meltdown in 1979, which resulted in the most serious accident in the history of the US commercial nuclear power generating industry. However, the reactor did not explode like a nuclear bomb.
The #4 reactor is the reactor at the Chernobyl Nuclear Power Plant (Pripyat, Ukraine) that exploded on April 26, 1986. It is still the worst nuclear accident to ever take place anywhere.
The first ever reactor was in 1942, but not power producing. The first electric power producing reactor was in the UK in 1956
The only one that has ever exploded to my knowledge was at Chernobyl in 1986, and this was due to a steam pressure surge during an experimental procedure that was badly planned and carried out. This type of reactor was unique to the Soviet bloc countries and is no longer built, though I think some may still be in operation.
No, a nuclear reactor would not explode solely due to the absence of people. Reactor safety systems are designed to shut down automatically in case of any abnormal conditions, such as the reactor overheating or losing cooling. The presence or absence of people would not impact the reactor's physical safety mechanisms.
The main one is disbursal of its radioactive contents into the environment. The fallout from this has the potential to be much worse than the fallout from nuclear weapons, as the amount of material inside the reactor that can be disbursed is far larger than the fallout that can be generated by any nuclear weapon ever deployed.
The only incident which might have become a disaster was the Three Mile Island one in 1979. This caused a partial meltdown of the core, and was certainly a commercial disaster, though the effect to the public was minor, if anything.
one of the largest earthquakes ever recorded followed by a tsunami that disabled the backup diesel generators.
Short answer: Chernobyl. Physics answer: That heat has to go somewhere and it's not inclined to have a discussion about where. The heat in a fission reactor is generated by the interaction between the fuel (uranium) and the neutrons that are produced by the interaction itself. Basically, the neutrons cause the uranium atoms to break (fission). When the uranium atoms break, they release heat (nice, because we need that for things like generating electricity) and more neutrons (sort of nice, because it feeds itself). But if you don't get the heat out of there, you've got a major problem on your hands. In order to control the heat released by uranium/neutron interactions, to slow them down, nuclear reactors have "control rods" that can absorb neutrons. They're usually made of carbon. If you screw this part up, and there is no coolant, your reactor turns into the scariest heat factory you ever dreamed of. Flooding it with coolant now will result in two things: Steam explosions and radioactive coolant. If a coolant leak is all you get in this scenario, then count yourself lucky. You just avoided a complete reactor melt-down, the equivalent of an atom bomb detonating in your neighborhood.
The worst ever nuclear power accident occurred at Chernobyl in the Ukraine in 1986, when most of an operating reactor was spread around the surrounding countryside and a plume of gaseous activity reached many other European countries. However this was one of a kind, fortunately, nothing similar has ever happened elsewhere, and the PWR and BWR units used in the US and most of the world have been very safe and reliable. Nothing similar could happen unless there was a major disruptive failure of a pressure vessel, and this is judged to be an incredible accident, taking the level of incredibility at once in a million years, per reactor.