Document: NRC Regulatory Guide
Document ID: 769c53ca-7692-4fdf-9301-9fd64e37aa8f
Document Type: regulatory_guide
Title: Evaluations of Explosions Postulated To Occur on Transportation Routes Near Nuclear Power Plants (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2110/ML21105A439.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.91
CFR Part: 
CFR Title: 

Content:
that the rate of exposure to a peak positive incident overpressure in excess of 1.0 psi (6.9 kPa) is less than 1x10-6 per year when based on conservative assumptions, or 1x10-7 per year when based on realistic assumptions, is acceptable. Due consideration should be given to the comparability of the conditions on the route to those of the accident database. 3. If the facility with potentially explosive materials or the transportation routes are closer to SSCs important to safety than the distances computed using Equation (1), the applicant may show, through analysis, that the risk to the public is acceptably low on the basis of the safety-related structures capability to withstand blast and missile effects associated with detonation of the potentially explosive material. The analysis should include the following: DG-1388, Page 10 a. Justification for any reduction in the TNT equivalent mass based on reaction kinetics, site topography, or prevailing meteorological conditions. b. Characterization of the blast pressure acting on the structure, including any reflection based on orientation, using the methodology from UFC 3-340-02. c. Characterization of the structure’s resistance to load using the methodology from UFC 3-340-02 (the resistance to load should be reduced to account for the capacity used to resist the load combination in Equation (7)). d. Response of the structure to the blast pressure, using methodology from UFC 3-340-02, which shows the structure responds in an elastic manner. Blast pressure should be considered to act both inward and outward to account for dynamic stress reversal. e. Analysis of overturning and sliding stability must be assessed, as well as the ability of supporting structures to carry loads transmitted from the directly loaded exterior surfaces. f. Analysis showing that the structure can resist missiles can be accomplished using the methodology from “A Review of Procedures for the Analysis and Design of Concrete Structures to Resist