Document: NRC Regulatory Guide
Document ID: 239cc7c1-f2cb-46cc-945d-8009db28aa6c
Document Type: regulatory_guide
Title: General Site Suitability Criteria for Nuclear Power Stations + HISTORY - HISTORY 12/2023 – DG-4034 , Proposed Revision 4 12/2011 – DG-4021 , Proposed Revision 3 02/1995 – DG-4004, Second Proposed Revision 2 11/1992 – DG-4003, Proposed Revision 2 (Rev. 4)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2312/ML23123A090.pdf
Revision Date: 2023-10
Chapter: 
Section ID: RG-4.7
CFR Part: 
CFR Title: 

Content:
heric variables, distance from the source, radionuclide chemical and physical characteristics, and whether airborne releases occur from a single plant stack or through multiple building vents or plant stacks. If the dispersion of radioactive material released following a design-basis accident is insufficient at the boundary of the exclusion area (see section C.1.3 of this RG) or at the outer boundary of the LPZ, the plant design will not satisfy the requirements in 10 CFR 50.34(a)(1). In this case, the design will be required to include appropriate and adequate compensating engineered safety features. In addition, meteorological conditions are to be determined (1) for use in the environmental report required by 10 CFR Part 51, (2) for verification of the criteria in the design control document for a certified plant design, and (3) for use in demonstrating that airborne radiological effluent release limits can be met for any individual located off site, as required by 10 CFR 100.21(c)(1). RG 1.23 describes atmospheric data that the staff considers acceptable for the required assessment of the potential dispersion of radioactive material. NUREG-0800, section 2.3.3, describes the NRC staff’s review procedures for onsite meteorological measurements programs. Evaluations of potential sites should consider available atmospheric data for the local site area. Atmospheric variables for canyons or deep valleys often differ substantially from those measured for the general region. Other topographical features, such as hills, mountain ranges, and lake or ocean shorelines, can affect the local atmospheric conditions at a site and can cause the dispersion characteristics at the site to be less favorable than those in the general region. Such cases might require more stringent design or effluent objectives. In some areas, local atmospheric conditions cause inversion, which severely limits DG-4034, Page 16 local atmospheric dispersion capabilities. Therefore, siting decisions