Three new standards for prevention and control of radioactive pollutants will be implemented
According to the information released on August 31 on the website of the Ministry of environmental protection(hereinafter referred to as"the Ministry of environmental protection"),the three national standards for the prevention and control of radioactive pollutants concerning the environmental radiation and radioactive waste treatment of nuclear power plants issued by the Ministry of environmental protection and the General Administration of quality supervision,inspection and Quarantine on February 18 this year will be implemented as of September 1.
The newly implemented three standards are respectively:Regulations on environmental radiation protection of nuclear power plants(gb6249-2011),performance requirements for solidified bodies of low and medium level radioactive wastes-cement solidified bodies(gb14569.1-2011)and technical requirements for discharge of radioactive liquid effluents from nuclear power plants(gb14587-2011).At the same time,three old standards are abolished.
According to the Ministry of environmental protection,the implementation of three new standards aims to implement the environmental protection law of the people's Republic of China and the law of the people's Republic of China on the prevention and control of radioactive pollution,prevent and control pollution and protect human health.
Environmental radiation regulations
More specific and detailed
In terms of environmental radiation protection of nuclear power plants,the newly implemented standard specifies the environmental radiation protection requirements for the site selection,design,construction,operation,decommissioning,expansion and modification of land-based fixed nuclear power plants,and points out that the standard is applicable to land-based fixed nuclear facilities using light water reactors or heavy water reactors for power generation,and other reactor type nuclear power plants can refer to it.
It is reported that the revision of the previous standard in the regulations on environmental radiation protection of nuclear power plants(gb6249-2011)involves five aspects.
The reporter looked up the data and found that the original standard mentioned that:according to the degree of possible harm to the environment,accidents of nuclear power plants can be divided into expected operation events,major accidents,major accidents and the most credible accidents.In the new standard,the classification of design basis accidents in the original standard is revised into two categories:rare accidents and extreme accidents.At the same time,the frequency of rare accidents is defined as 10-4-10-2/reactor year,and the frequency of extreme accidents is defined as 10-6-10-4/reactor year.
In addition,in the new standard,the maximum credible accident of accident release source term in the approval stage of plant site in the original standard is changed to the hypothetical accident of site selection,and the corresponding dose acceptance criteria are given.At the same time,the new standard implements the total annual emission control of radioactive effluents according to the reactor type and power,and clearly stipulates the total annual emission control of carbon 14 in liquid radioactive effluents of light water reactor,and increases the control values of carbon 14 and tritium in air borne radioactive effluents of light water reactor and heavy water reactor.
The regulations on environmental radiation protection of nuclear power plants(gb6249-2011)also stipulates that the concentration of other radionuclides in the radioactive effluent at the trough discharge outlet of the coastal plant site,except tritium and carbon 14,
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