Document: NRC Regulatory Guide
Document ID: f4c5fb1d-efb9-4168-9804-5ad3f6f64d06
Document Type: regulatory_guide
Title: Reporting Procedure for Mathematical Models Selected To Predict Heated Effluent Dispersion in Natural Water Bodies
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739535.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.4
CFR Part: 
CFR Title: 

Content:
g Water Chinactks a. Type. The type of receiving water body should be identified in the MAT by the following number code: (1) lake (2) rime, tidal (3) river, nontidal (4) estuary (5) ocean (6) cooling pond (7) reservoir The entry for a model should include those water bodies to which the model is applicable. b. Depth at OutfaL Depth at outfall is defined as the naturally occumring extreme range of water depths, sich as might be caused by tides, likely to be encountered at the discharge point. c. Bottom Slope The near-field spatially averaged angle of the receiving water bottom in the direction of discharge should be specified for the prototype; the validity rane of bottom dope angles should be given for each model. Also, a bathymetric map of the discharge aren should be idcluded with the text. Such a map would be a convenient medium on which to display the geometric properties of the discharge and the orientations of model coordinate systems. d. Natural Stratification. Some receiving water bodies, especially lakes, exhibit natural thermal and/or saline stratification at some time during the annual thermal cycle. If such is the case for the prototype, the fact should be noted on the MAT, and the extent to which stratification affects the prototype should be described in the text along with a discussion of the ability of each model to simulate this situation. e. Natural Current. The predominant natural current in the immediate vicinity of the discharge should be specified; model entries should include the validity range of current speed and direction. Direction is defined as the clockwise angle between the horizontal flow component and local true North. For systematic natural current variations in more than one direction, multiple entries may be made. The detailed current structure within that portion of the water body likely to be affected by the discharge should be discussed relative to its impact on model applicability. 4. Dichargf Receiving Water Interactions a.