chernobyl
There are a few dangers that are inherent in a nuclear reactor. The major danger inherent in a nuclear reactor is the effects of radiation. Radiation poisoning can be extremely deadly and harmful. Other inherent dangers include radioactive waste and the potential catastrophic damage of an accident such as at Chernobyl.
The Chernobyl Nuclear Power Plant underwent a level 7 event - the worst accident so far. The plant, located in the Soviet Union near Pripyat in Ukraine lost its number four reactor on 26 April 1986. A link to the Wikipedia article on the accident is provided.
I think you are talking about nuclear reactors. PWR is a Pressurized Water Reactor, and is the basis for most power generators. BWR is a Boiling Water Reactor. As the water is a major moderating component, controlling the speed and intensity of the nuclear reaction, the steam bubbles in a BWR can present a problem.
Nuclear disasters are incidents that result in the release of radioactive material from a nuclear facility. They include both minor and major radiation releases.
That they would get nuclear weapons.
Three major nuclear accidents; namely:Three Miles Islands nuclear accident, USA, March 1979Chernobyl nuclear accident, Ukraine (former Soviet Union), April 1986Fukushima nuclear accident, Japan, March 2011
It is the containment building in which the reactor vessel and the primary cooling plumbing is housed. During normal operation, radiation levels inside are lethal. Additionally, this structure is designed to "contain" the highly radioactive materials in the event of a major accident.
Radiation poisoning moved around the world by the wind.
Pledge of soviet union not to use nuclear weapons as the first (1982).
large number of nuclear weapons that had been stockpiled in the republics
One major thing that he did that was often overlooked is when he told the Soviet Union to turn their ships full of nuclear missles that they were shipping to Cuba. And the Soviet Union did.
The major problems with using nuclear energy to produce electricity include the risk of accidents leading to radiation leaks, the challenge of long-term waste disposal, the potential for nuclear proliferation, and the high costs associated with constructing and decommissioning nuclear power plants.