Document: NRC Regulatory Guide
Document ID: d1045e85-64b0-4a83-8450-067a4fcd130f
Document Type: regulatory_guide
Title: Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants + HISTORY –HISTORY 04/2014 – Periodic Review of Revision 1 – Reviewed with issues for future consideration 02/1983 – Reissued 02/1983 to correct page 1.145-7 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740205.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.145
CFR Part: 
CFR Title: 

Content:
23, "Onsite Meteorological Programs," and provide bases for quantify- ing the effects of plume meander on effluent concentra- tions. Effluent concentrations measured over a period of I hour under such conditions have been shown to be substantially lower than would be predicted using the traditional curves (Ref. 7) of lateral and vertical plume spread. Lines indicate substantive changes from previous issue. 21n discussions throughout this regulatory guide, atmospheric dispersion will be considered as consisting of two components: atmospheric transport due to organized or mean airflow within the atmosphere and amospheric diffusion due to disorganized or random air motions. Plume depletion and surface deposition of airborne materials are not included in the dispersion models descibed in this guide. USNRC REGULATORY GUIDES Regulatory Guides are issued to describe and make available to the public methods acceptable to the NRC staff of implementing specific parts of the Commission's regulations, to delineate tech- niques used by the staff in evaluating specific problems or postu- lated accidents or to provide guidance to applicants. Regulatory Guides are not substitutes for regulations, and compliance with them is not required. Methods and solutions different from those set out in the guides will be acceptable if they provide a basis for the findings requisite to the issuance or continuance of a permit or license by the Commission. This guide was issued after consideration of comments received from the public. Comments and suggestions for improvements in these guides are encouraged at all times, and guides will be revised, as appropriate, to accommodate comments and to reflect new informa- tion or experience. Comments should be sent to the Secretary of the Commission, U.S. Nuclear Regulatory Commission, Washington, D.C. 20555, Attention: Docketing and Service Branch. The guides are issued in the following ten broad divisions: 1. Power Reactors 6. Products 2. Research and