This standard specifies the technical requirements for the design and operation of radioactive wastewater discharge systems in light water reactor nuclear power plants. This standard applies to the radioactive wastewater discharge system of light water reactor nuclear power plants. The radioactive wastewater discharge systems of light water reactors for other purposes can also be implemented by reference. GB 14587-1993 Technical Regulations for Radioactive Wastewater Discharge Systems of Light Water Reactor Nuclear Power Plants GB14587-1993 Standard download and decompression password: www.bzxz.net

UDC 621.039.58/.59
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National Standard of the People's Republic of China
GB1458793
Light Water Reactor Nuclear Power Plant Radioactivity
Technical Regulations for Wastewater Discharge Systems
Technical rules for discharge system of radioactive waste water from LWR nuclear power plant released on 1993-08-30
National Environmental Protection Agency
National Technical Regulations Bureau
1994- 1 Subject content and scope of application
GB14587-93
This standard specifies the technical requirements for the design and operation of radioactive wastewater discharge systems in light water reactor nuclear power plants. This standard applies to the radioactive wastewater discharge system of light water reactor nuclear power plants. The radioactive wastewater discharge systems of light water reactors for other purposes can also be implemented by reference.
2 cited standards
Nuclear power plant environmental radiation protection regulations
GB6249
GB8703
Radiation protection regulations
GB9133
Radioactive waste classification standards
3 terms
3.1 Discharge outlet
The interface between the nuclear power plant drainage channel and the environmental receiving water body, 3.2 Wastewater discharge system
Take nuclear power plant radioactive wastewater A system that starts from the emission monitoring tank or monitoring point and ends at the emission outlet of the nuclear power plant. 4 Goals
4.1 Safety Goals
4.1.1 The discharge of radioactive wastewater from nuclear power plants should follow the principle of "as low as reasonably achievable". 4.1.2 When radioactive wastewater is discharged into environmental receiving water bodies under normal operating conditions and expected operating events, it must be ensured that the dose equivalent to the public is only part of the nationally prescribed limit. 4.2 Design objectives and operational objectives
4.2.1 The operating organization must determine the annual discharge of radioactive wastewater from each light water reactor nuclear power plant to the The design limit value of the total activity of environmental emissions shall be approved by the competent department and the national environmental protection department as the annual emission management limit value.
4.2.2 For radioactive wastewater from different sources in nuclear power plants, the operating unit shall separately stipulate the design limits for the radioactive concentration of the discharged wastewater based on the quantity of wastewater and the types of radionuclides contained, subject to approval by the national environmental protection department. , as the management limit for the radioactivity concentration of wastewater discharged by operating units.
4.2.3 The total annual emissions should be controlled on a quarterly basis, and the total emissions within three consecutive months should not exceed one-half of the annual emission management limit. Guohao Technical Supervision Bureau approved on 1993-08-14 the implementation on 1994-04-01www.bzxz.net
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5 Discharge of Radioactive Wastewater
GB14587-93
5.1 Radioactive Wastewater Discharge should be concentrated as much as possible. 5.2 Before being discharged into the environmental receiving water body, all radioactive wastewater from a nuclear power plant must pass through the drainage channel of the nuclear power plant, mix with cooling water, and then be discharged from the discharge outlet.
5.3 The flow rate of wastewater discharged into the drainage channel should be determined based on the dilution capacity of the cooling water in the drainage channel. 5.4 Wastewater treated by the radioactive waste liquid treatment system must be discharged in a trough. Low and weak radioactive wastewater that does not need to be treated if the radioactive concentration does not exceed the discharge management limit should also be discharged in a trough. 5.4.1 When using trough discharge, at least two monitoring troughs with the same capacity should be set up. The effective volume of each monitoring tank should be greater than the amount of wastewater flowing during the completion of mixing, neutralization, sampling analysis and discharge processes. 5.4.2 The monitoring tank must be equipped with a mixing device (such as a circulating mixing pump) so that representative samples can be obtained from the tank. 5.4.3 From the beginning of sampling to the end of the discharge process, there should be no wastewater flowing into the monitoring tank. 5.5 For non-tank discharged wastewater, sampling and analysis must be carried out before discharge, and the samples taken should be representative. 5.6 Wastewater whose radioactivity concentration does not exceed the discharge management limit must be signed and approved by the radiation protection personnel or authorized person of the nuclear power plant before it is allowed to be discharged.
5.7 Wastewater whose radioactive concentration exceeds the discharge management limit shall not be discharged. Generally, the dilution method shall not be used to discharge wastewater exceeding the emission management limit into nuclear power plant drainage channels.
5.8 Low- and weak-radioactive wastewater containing suspended solids, such as floor washing water, laundry water, and shower water, must be filtered before being discharged into the nuclear power plant drainage channel, even if the radioactivity concentration is lower than the emission management limit. 5.9 The quality of discharged wastewater should meet the discharge requirements. 5.10 Necessary measures should be taken to ensure that waste water and cooling water are evenly mixed in the drainage channel. 5.11 Wastewater that meets the reuse requirements after treatment should be reused within the nuclear power plant as much as possible to reduce emissions. 6 Discharge Outlet
” 6.1 Nuclear power plant wastewater discharge outlet should avoid centralized water intakes, economic fish spawning areas, aquatic life farms, salt fields, seaside swimming pools and entertainment venues.
6.2 The discharge outlet should be selected based on the specific physical and geographical environment of the nuclear power plant location and the specific requirements of the project. The final solution determined should be verified through hydraulic model testing and reported to the competent authority and national environmental protection. Approved by the department. 6.2.1 The diffusion dilution law of drainage in a large area of ??water around the plant site must be found through simulated diffusion tests, analysis and calculations, and the dilution capacity of the receiving water body for drainage must be determined
6.2.2 Determination. The environmental impact of the accumulation of radioactive sediments in the receiving water must be considered when designing the discharge outlet. 6.2.3 For nuclear power plants located on rivers, the discharge outlet should be located downstream of the centralized water intake area. The water quality at the first water intake point downstream of the discharge outlet should be considered. Comply with corresponding water quality standards.
6.3 Discharge outlets should be equipped with corresponding signs
7 Monitoring and monitoring points
7.1 Sampling must be carried out before discharge of radioactive wastewater from different sources in nuclear power plants. , measure the radioactive concentration, and analyze the nuclide composition as needed. Continuous monitoring devices should be installed on each radioactive drainage pipeline discharged into the nuclear power plant drainage channel to monitor and record the radioactive concentration, flow rate and accumulated water volume
7.2· The continuous monitoring device should have an alarm function. When the radioactivity concentration of the discharged wastewater exceeds the management limit or the monitoring device fails, an audible and visual alarm should be issued in the main control room or the local control room, and the discharge should automatically stop. 7.3 Drainage in the nuclear power plant. At the end of the canal, the radioactivity concentration and nuclide composition of the wastewater should be measured and analyzed. 7.4 The continuous monitoring device should have sufficient sensitivity and accuracy, and should be regularly calibrated by the measurement and testing unit. The transfer scale should be recorded in detail 2||tt| |Record.
GB14587-93
Nuclear power plants should draw the distribution map of wastewater discharge monitoring points. 7.5
8 Monitoring results
8.1 Monitoring results (amount of wastewater discharged, Radioactivity concentration, total activity, nuclide composition, etc.) must be compiled into documents and regularly reported to the relevant competent authorities to facilitate the evaluation of the discharge of radioactive wastewater. 8.2 Monitoring records and documents should be properly kept, and reports submitted to the competent authorities must be Archive. Additional Notes:
This standard is proposed by the State Environmental Protection Administration. This standard is drafted by the Beijing Nuclear Engineering Research and Design Institute. The main drafters of this standard are Zhao Liang and Gao Jiabao. This standard is interpreted by the State Environmental Protection Administration. .
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