Document: NRC Regulatory Guide
Document ID: 4e88bc9c-73b4-419d-a312-fe7e31653337
Document Type: regulatory_guide
Title: Use of ARCON Methodology For Calculation Of Accident-Related Offsite Atmospheric Dispersion Factors
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2116/ML21165A005.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.249
CFR Part: 
CFR Title: 

Content:
ewer at: OMB Office of Information and Regulatory Affairs (3150-0011, 3150-0151, 3150-0093), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 17th Street, NW Washington, DC 20503; e-mail: oira_submission@omb.eop.gov. Public Protection Notification The NRC may not conduct or sponsor, and a person is not required to respond to, a collection of information unless the document requesting or requiring the collection displays a currently valid OMB control number. DG-4030, Page 4 CONTENTS A. INTRODUCTION .................................................................................................................................. 1 B. DISCUSSION ......................................................................................................................................... 5 C. STAFF REGULATORY GUIDANCE ................................................................................................... 7 1. General Considerations .......................................................................................................................... 7 2. Calculation of χ/Q Using ARCON ......................................................................................................... 7 2.1 Meteorological Data Input ............................................................................................................... 7 2.1.1. Onsite Meteorological Data ................................................................................................ 8 2.1.2 Alternative Meteorological Data ......................................................................................... 8 2.2 Source—Receptor Pair Distances and Directions .......................................................................... 10 2.2.1 Distance from Source to Receptor .................................................................................... 10 2.2.2 Direction from Source to Receptor