Document: NUREG-0800
Document ID: 6524eea0-4e14-443b-9533-59e5ba85e0cb
Document Type: srp
Title: ACCIDENTAL RELEASES OF RADIOACTIVE LIQUID EFFLUENTS IN GROUND AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730449.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.13
CFR Part: 
CFR Title: 

Content:
w of radiation protection to carry out further dose calculations. Further analyses using progressively more realistic and less conservative modeling techniques, should be undertaken if the preliminary results are not acceptable. Independent calculations should be made of liquid effluent transport for the surface pathways identified. For preliminary analysis, the staff should employ simplified calculational procedures or models. The analysis should be performed using demonstrably conservative coefficients and assumptions, and the physical conditions (such as lowest recorded river flow) likely to give the most adverse dispersion of the liquid effluent. The applicant’s model assumptions and results should be compared with the staff’s results to ensure that the results are comparably conservative. The estimation of liquid effluent dispersion should reflect potential future changes that might result from variations in use by known and likely future surface and groundwater users. Concentrations of radionuclides in the body of water under consideration should be calculated by the organization responsible for review of radiation protection based on the staff’s dispersion computations and with initial concentrations corresponding to the most adverse contamination of surface waters. If the concentrations computed by conservative simplified methods are not acceptable, more precise and less conservative models, such as those used for hydrothermal prediction and coefficients, should be employed by the staff. The use of numerical models by the applicant should be reviewed with consideration given to whether standard and accepted practices have been followed. For example, there are ASTM publications on the simulation of subsurface fluid flow and contaminant transport that may be used as a guide(see ASTM references in the Reference section). In the performance of detailed model simulations, the review should determine if the applicant has followed a strategy such as that