HJ 941-2018Classification method for environmental accident risk of enterprise (English PDF)

3.1 Environmental accident

Refers to pollutants or radioactive materials due to factors such as pollutant discharge or natural disasters, production safety accidents, etc.

Toxic and harmful substances enter the atmosphere, water, soil and other environmental media, suddenly causing or may cause environmental quality degradation, endangered and the public's physical health and property safety, or the destruction of the ecological environment, or the major social impact, need to be tightened an emergency response to the incident.

3.2 Environmental accident risk

Refers to the possibility of a sudden environmental incident in the enterprise and the degree of harm that may be caused.

3.3 Environmental accident risk substance Environmental accident risk substance

It is characterized by toxic, harmful, flammable, explosive, and easily diffused, and may be external to the enterprise under accidental release conditions.

Chemical substances that cause harm and pollution to the environment. Referred to as "risk substance".

3.4 Critical mass of risk substance

Refers to the risk substance of a certain or certain type of environmental incidents according to the toxicity of the substance, the environmental hazard and the characteristics of easy diffusion.

The number.

3.5 Environmental risk unit

Means a device, facility or location that produces, processes, uses or stores a hazardous substance on a permanent or temporary basis, or several (sets) of devices, facilities or places of the same enterprise with an edge distance of less than 500 meters.

23.6 Environmental risk receptor

Refers to an external group of enterprises that may be harmed in a sudden environmental incident, with certain social or ecological functions.

Unit or area, etc.

3.7 clean polluted wastewater Refers to wastewater that is uncontaminated or slightly contaminated and that has a slightly elevated water temperature and that meets emission standards without treatment.

3.8 accident wastewater by accident Refers to the leakage of substances discharged in the event of an accident, and the production of other toxic and hazardous substances generated during the rescue process.

Waste water, clean waste water, rain water or fire water.

4 rating procedure

The ratio of the number of risky substances in a sudden environmental event to its critical mass (Q), based on the production, use, storage and release of the enterprise, Evaluation of production process and environmental risk control level (M) and assessment of environmental risk receptor sensitivity (E) as a result, the risk of sudden atmospheric environmental events and the risk of sudden water environmental events will be assessed separately, and the enterprise will burst into the atmosphere or water ring.

The risk level of environmental events is divided into three levels. general environmental risk, large environmental risk and major environmental risk, with blue and yellow respectively.

Color and red logo. At the same time, enterprises involved in the risk of sudden atmospheric and water environmental events, determine the sudden environmental environment of enterprises with high ranks.

Event risk level.

The enterprise has a number of independent factories adjacent to the location, and the risk level can be assessed separately according to the plant area, and the enterprise is determined by the higher rank.

The risk level of sudden environmental events is characterized and characterized, and can also be characterized as the risk level of sudden environmental events in the enterprise (a certain plant area).

The company has set up a number of independent factories with distant locations, and evaluates and determines the risk level of each plant.

Factory area) Risk level of sudden environmental incidents.

The risk grading procedure for enterprise emergencies is shown in Figure 1.

Enterprise basic situation investigation and analysis Q5 Risk substance identification Identification of risk substances based on the types and quantities of various chemical substances involved in the company. Sudden environmental incident risk substances and

3 See Appendix A for a list of critical quantities.

6 Risk assessment of sudden atmospheric environmental events

6.1 Calculate the ratio of the amount of gas-related risk substances to th.