In the city of Chernobyl a nuculer power plant explode releasing nuculer waste causing harm to all living things nearby.
A lot of the effects from the explosion are shown in the video below.
The nuclear reactor was flawed with under trained personnel working it.
This failure of the Soviet Union illustrates how desperate they were to get ahead and now rushing caused them greatly.
If others found out about the details of the nuclear explosion other countries might not think they are capable of possessing nuclear power and creat laws to restrict them.