Document: NRC Regulatory Guide
Document ID: 687c884d-2807-4ca3-ac21-69b87c59f4ab
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:
.............................. 10 2.2.1 Distance from Source to Receptor .................................................................................... 10 2.2.2 Direction from Source to Receptor ................................................................................... 12 2.3 Release Characteristics .................................................................................................................. 12 2.3.1 Ground-Level Releases ..................................................................................................... 13 2.3.2 Elevated (Stack) Releases ................................................................................................. 13 2.3.3 Vent Releases .................................................................................................................... 14 2.3.4 Point Source ...................................................................................................................... 15 2.3.5 Diffuse Source—Point Receptor ....................................................................................... 15 2.4 Determining the 95-Percentile and 99.5-Percentile χ/Q Values .................................................... 15 2.4.1 Determination of 95th-Percentile Overall Site χ/Q ........................................................... 16 2.4.2 Determination of 99.5-Percentile Maximum Sector χ/Q .................................................. 16 D. IMPLEMENTATION ........................................................................................................................... 17 REFERENCES ........................................................................................................................................... 18 APPENDIX A ........................................................................................................................................... A-1 DG-4030, Page 5 B. DISCUSSION Reason for Issuance This RG provides guidance to