Document: NRC Regulatory Guide
Document ID: eb3f5778-b26b-4ba0-9962-f7101bddfff7
Document Type: regulatory_guide
Title: (Rev. 3005)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739900.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.8
CFR Part: 
CFR Title: 

Content:
es. Limiting conditions for operation should be estab lished for .chemical releases (including biocides) associated with all plant discharge water systems, for other plant-related chemical usages such as equipment cleaning and maintenance, and for the use of herbicides in maintenance of transmission line rights of way and access roads. The purpose of limits on chemical releases is (1) to protect the local biota from lethal and sublethalseffects of exposure to discharged chemicals, (2) to ensure that continued multiple use of the receiving waters by human population is protected, and (3) to control degradation of the quality of the receiving waters. The bases should include a summary statement of the considerations and justifications used in establishingihe limits. 'The proposed maximum concentrations of chemicals at identified points of release should be compared with the concentrations already existing in the receiving waters. The organisms to be protected and the water quality parameters to be monitored should be identified. 2.3.1 Biocides Limits should be established for all biocide usage which results in an offsite exposure of biota (including the hunian population). Effluent concentration limits, expected frequency and duration of use, and estimated total annual usage should be identified. Limits for herbicide usage for maintenance of transmission line rights of way 'should be established. 2.3.2 Corrosion Inhibitors Limits similar to those presented in Section 2.3.1 should also be provided for the use of corrosion inhibitors. When heavy metals are used or their concentrations in station effluents are increased above ambient levels, limits should be provided. These limits might be con. ditioned according to frequency of use, duration of use, and total annual usage. 2.3.3 Suspendedannd Total Dissolved Solids Limits should be provided for the dissolved and suspended solids in the plant effluents. Limits should be stated for either the specific chemicals 'or for