Man-made emergency situation
A situation in case of which in the object, in a certain aerial, land or water territory normal conditions for human lives and their activities are violated, there originates a threat to their lives and health, there is damage to the population property, economy and environment.

Note: Man-made emergency situations differ according to their place of origin and according to the nature of main contamination factors of the emergency situation source.

Source of man-made emergency situation
Dangerous man-made incident, because of which man-made emergency situation occurred in the object, in a certain aerial, land or water territory.

Note: The accidents, fires, explosions or secretions of various energies in transportation means or industrial objects are classified as dangerous man-made incidents.

Accident
A dangerous man-made incident, that creates a threat to human life, health and gives rise to the destructions of buildings, constructions, equipment and transportation means, disorders in industrial or transportation processes, as well as damages environment.

Note: The huge accident, which, as a rule, is followed by human victims, is considered to be a disaster.

Man-made danger
A situation, which is peculiar to the technical system, production or transportation objects, is expressed by a harmful influence of man-made emergency situation source on human beings and environment, or by a direct or indirect harm to a human being or environment in the process of normal exploitation of those objects.

Vulnerable factor of man-made emergency situation source
A component of hazardous incident, which is characterized by physical, chemical and biological effects or manifestations, which are determined or expressed by the corresponding parameters.

Vulnerable effect of man-made emergency situation source
Negative influence of one or several harmful factors of man-made emergency situation source on human life and health, agricultural animals and plants, objects of economy and environment.

Potentially dangerous object
An object, where radioactive, inflammable-explosive, chemically and biologically dangerous materials are used, produced, reprocessed, kept or transported, which create a real threat for the origination of emergency situation.

Potentially dangerous material
A material which due to its physical, chemical, biological or toxicological qualities presents a danger for human life and health, animals and plants, environment and buildings.

Border permissible density of dangerous material
The maximum amount of dangerous material in land, air or water environment, food, food raw material and feed counted in a single unit of volume or weight which, being in constant contact with people or affecting them within a certain period of time, practically doesn't have any influence on human health and doesn't bring to unfavorable consequences.

Infection zone
A land or water territory within the borders of which radiological, chemical or biological dangerous materials are spread or brought in such amounts, which during a certain period of time create a danger for people, agricultural animals and plants.

Note: Radiological, chemical and biological infection zones are specified.