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.
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A nuclear reactor can explode if there is a buildup of steam pressure, causing a steam explosion, or if there is a core meltdown leading to a subsequent hydrogen explosion. This can release radioactive material into the environment and cause widespread damage.
No, a nuclear reactor cannot explode like a nuclear bomb. The design and process within a nuclear reactor are different from those in a nuclear bomb. In a reactor, the control systems prevent the conditions needed for a nuclear explosion to occur.
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.
Reactor number 4 at the Chernobyl nuclear power plant in Ukraine exploded on April 26, 1986.
No, a nuclear reactor cannot be used as a nuclear weapon. The design and purpose of a nuclear reactor are different from those of a nuclear weapon. The fuel and technology used in reactors are not suitable for producing the type of explosive power needed for a nuclear weapon.
Yes, the sun is a nuclear fusion reactor.