Question: what are the main causes of nuclear hazards?
Answer: Nuclear Accidents From Nuclear Energy Generation Plants. ... 
The Use of Nuclear Weapons as Weapons of Mass Destruction (WMD) ... 
Use of Radioisotopes. ... 
Mining. ... 
Spillage of Radioactive Chemicals. ... 
Tests on Radiation. ... 
Cosmic Rays and Other Natural Sources. ... 
Nuclear Waste Handling and Disposal.