Document: NRC Regulatory Guide
Document ID: c9ebcbb0-96c4-4d29-be51-5acae9cc858a
Document Type: regulatory_guide
Title: Estimating Aquatic Dispersion of Effluents from Accidental and Routine Reactor Releases for the Purpose of Implementing Appendix I (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740390.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.113
CFR Part: 
CFR Title: 

Content:
sed on their adherence to physical principles and their proven reliability in simulating prototype data. Models will be compared, in terms of physical principles, to those listed in the references, in accordance with the classification of receiving water. However, the staff does not accept these models a priori. Because most existing sediment uptake and transport modeling techniques are crude, the applicant should demonstrate that the model Is conservative or realistically simulates the prototype. The model verification will be accepted based on the quality of comparison with measurements for water bodies having characteristics 1.113-44 'ilar to those at the site. Actual measurements of sorption characteristics for pertinent Aionuclides should be presented for areas of the water body within the influence of the plant. r4 se measurements should reflect seasonal variations of sources and sinks (spatial and grain ;ize) and the physical and chemical properties of the receiving water. Estimates of sediment movement should be supported by actual field measurements (by the kpplicant or others). Events and processes affecting sediment movement and deposition (e.g., 9loods, storms, wave activity, and estuarine stratification) should be considered. Changes in :he character of the receiving water that would influence sediment transport (e.g., dams. Jetties, Iroins, and shoreline changes) should be considered. 1.113-45 LIST OF SYMBOLS Symbol Description A Cross-sectional area of river or estuary b Width of estuary at water surface Width of river C Concentration of constituent in water CE Concentration in epilimnion of stratified impoundment Ch Chezy resistance coefficient CH Concentration in hypolimnion of stratified impoundment Ci Input concentration In the upper layer of a stratified impoundment Ci' Input concentration to the lower layer of a stratified impoundment Ci" Input concentration for the total impoundment C° Steady-state concentration of a nondecaying substance CT