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Why it happens?
Intentional Use of Nuclear Weapons in the event of war:

Nuclear attacks may make use of nuclear weapons, which are extremely destructive bombs powerful enough to destroy an entire city. With the advancement of scientific research in the world, several countries have acquired the technology to produce Nuclear Arms, which are more destructive and harmful than the atom bomb used more than half a century ago. Nuclear bombs have openly been used twice, both times by the United State against Japan during World War II (1939-1945). On August 6, 1945, the city of Hiroshima was almost completely destroyed, and three days later the city of Nagasaki was bombed. Hundreds of thousands of people died as a result of the attacks, and the cities were in ruins.

Accidental Explosion of Nuclear Weapons:

Nuclear weapons are designed with great care to explode only when deliberately armed and fired. Nevertheless, there is always a possibility that, as a result of accidental circumstances, an explosion will take place inadvertently. Although all conceivable precautions are taken to prevent them, such accidents might occur in areas where weapons are assembled and stored, during the course of loading and transportation on the ground, or when actually in the delivery vehicle, e.g., an airplane or a missile.

Accidents in Nuclear Power Project etc.:

There is also a risk of accidental exposure to harmful radiation from the several nuclear reactors used for generation of power. Though construction and operation of nuclear power plants is closely monitored and regulated an accident, although unlikely, is possible. The potential threat from an accident at a nuclear power plant is exposure to radiation. This exposure would occur from the release of radioactive material into the environment. The area affected would depend on the amount of the release, wind direction and speed and weather conditions. Other accidental exposure of radiation could be due to accident with the carriage of radioactive material during transportation; wrong/faulty practices, failure of machinery of a radiation facility; etc.

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