Document: NUREG-0800
Document ID: a397b98f-e122-4d15-8471-5259fb45b58b
Document Type: srp
Title: and BTP 11-6 since the use of durable and passive design features would provide
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1305/ML13051A458.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.2
CFR Part: 
CFR Title: 

Content:
rface water or groundwater resources, or require the treatment of surface water or groundwater for use as finished drinking water. When considering surface water resources, the selected point of entry in unrestricted areas should be identified as that location in a surface water body or stream affected only by near-field dilution near the point of entry. Modeling approaches that assume the effects of far-field dilution or turbulent mixing will not be acceptable to the staff as such assumptions are expected to result in excessively high and non-conservative dilution factors. In instances where far-field dilution and turbulent mixing are the only processes by which accidental releases are dispersed in the environment, the applicant should provide a justification for this approach and sufficient information to enable the staff to conduct an independent evaluation of the proposed dispersion processes. For groundwater resources, the applicant should assume the presence of a hypothetical well located at a nearby distance from the site boundary and depth within an aquifer, where the effects of groundwater hydraulic gradient, recharge properties, and velocity are suitable for groundwater contamination, would be acceptable in characterizing radionuclide concentrations in groundwater. As before, groundwater modeling approaches that result in excessively high and non-conservative dilution factors will not be acceptable to the staff. Finally, the consequence analysis may not take credit for the use of typical water supply system treatment methods as a mean of removing the presence of radioactivity or reducing radionuclide concentrations in finished drinking water or water used in food processing and as an ingredient. The health physics staff will review the supporting basis for the selected scenario, the reasonableness of assumptions, and the degree of conservatism applied in modeling the scenario and selection of model parameters. With respect to consumption rates of water and