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:
lity of the applicant. The NRC staff recognizes that the applicant may choose initially to use simplified models employing demonstrably conservative assumptions. The most conservative assumption would be no dilution of the radwaste discharge and a travel time ofI zero. In some cases, this extreme approach may be acceptable for calculation of dose to man. Should the results of this Initial analysis support a cohclusion of compliance with Apoendix I of 10 CFR Part 50, no further effort is indicated. However, if compliance is not demonstrated by the simplified analysis, more refined and more realistic analyses of liquid transport may be undertaken. The NRC staff will also consider such analyses acceptable provided the applicant establishes the realism of the model, coefficients, parameters, and flow field. 0. IMPLEMENTATION The purpose of this section is to provide information to license applicants and licensees regarding the NRC staff's plans for implementing this regulatory guide. This guide reflects current Nuclear Regulatory Commission practice. Therefore, except in those cases in which the license applicant or licensee proposes an acceptable alternative method, the method described herein for complying with specified portions of the Coamissions regulations is being and will continue to be used in the evaluation of submittals for operating license or construction permit applications until this guide is revised as a result of suggestions from the public or additional staff review. 1.113-3 APPENDIX A LIQUID EFFLUENT TRANSPORT AND WATER USE MODELS This appendix describes transport and water use models for calculating the radiation doses to the public that may result from radioactive material In liquid effluents released to surface water bodies. Symbols used in this description are defined in the "List of Symbols" following the appendix. 1. INITIAL DILUTION Initial dilution of liquid radioactive effluents (e.g., dilution upon discharge to the receiving water body) is