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:
1, the MAT allows entries for four models is well w the prototype. This sructuring does not imply that four dffrent modes should be sased; any number would be acceptable. e. Individual entries to the MAT usually consst of either a YES response or a numerical value. In casm where a numerical entry possesses units of measure, the International System of Units (SI) is preferred. Under circumstanoes in which the entry is not applicable to the conditions of the prototype or model, a response of N/A may be ued. f. The values of a number of MAT entries depend on which coordinate system is applied to a model. The terms longitudinal," "lateral," and "vertical" have been propoded to define the ortholnel axes of a horizontal discharge that propagate losibtudina~y in the discharge direction, laterally in the horizontal transverse discharge direction, and vertically In the tranverse discharge direction. The applicant shoud specify his choice of model coordinate system relative to local true North at the prototype. 2. Dblcliw Cchactewktk Most descriptive properties of the disckarge are supplied by a simple binary choice of entries (Exhlbit 1). Except where otherwise stated, a YES response in the appropriate MAT location is sufficient. a. Type. Discha type should be identified as either single port or multiport; a discharge canal is regarded as a single port. If the prototype dischare is a multitnmture and/or multiport variety, the total number and spacing of exit ports for each structure should be given in the descriptive text. b. SbWp The exit port shape should be identified as either round or rectangular; a slot jet is considered rectangular. If a model uses a slot jet approximation for a multiport diffuser, the entry should indicate a rectangular shape for the model. The linear dimension of each exit port should be specified, and irregulady shaped discharge ports should be described in the text. c. Location. The discharge location is either shoreline or offshore. Shoreline is