Although nuclear energy has many applications, concerns still remain in the area (s) of:

control of facilities and waste products

accidental spills, leakage and theft of materials

lack of safety training for employees

all of these

the answer is the last one : All of these

Answer: all of these

Explanation:

Nuclear energy is the energy that is generated when the nucleus of a heavy atom breaks and split into particles that is called as fission or fusion of two nuclei. These processes leads to liberation of heat and radiations. The liberation of heat and radiation from a nuclear reactor can cause injuries, explosions and even deadly mutations. The leaked out heat or radiation could be source of heat energy which can be stolen to generate electricity. Lack of safety training to the employees can lead to health hazards. The control should be taken care of to prevent injuries and fatalities. Also the nuclear waste disposal has become an important concern as the nuclear waste can lead to mutations and explosions if not disposed off properly.