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:
e estimates are used, an exposure rate less than 1x10-6 per year is sufficiently low. If it cannot be shown that the distance to the fixed facility or transportation route is great enough, or that the probability or exposure rate is low enough to render sufficiently low the risk of damage to a structure housing a system or component that must be protected, an analysis of the blast load effects may be made. The methodology from UFC 3-340-02 can be used to model the blast pressure, characterize the structure’s resistance to load, and determine the response of the structure to the blast pressure. The appropriate pressure to use, reflected or incident, depends on the orientation of the element being analyzed and the direction of propagation of the blast wave. To be considered an acceptable result, the maximum response of the analysis must show that the structure responds in an elastic manner to the applied blast pressure loading. The blast pressure should be considered to act both inward and outward to 1 The exposure rate is based on the theory outlined in the Federal Emergency Management Agency’s “Handbook of Chemical Hazard Analysis Procedures”, November 2007 (Ref. 14). DG-1388, Page 8 account for dynamic stress reversal. Overturning and sliding stability should be assessed, as well as the ability of supporting structures to carry loads transmitted from the directly loaded exterior surfaces. The structure’s resistance to load should be reduced to account for the capacity used to resist the following load combination: ܥ= ܦ+ ܮ+ ܶ௢+ ܴ௢ (7) where, C = combined load effect (psi or kPa) D = dead load effect (psi or kPa) L = live load effect (not including wind or snow loads) (psi or kPa) To = thermal load effect during normal operating or shutdown conditions (psi or kPa) Ro = pipe reaction effect during normal operating conditions (psi or kPa) Consideration of International Standards The International Atomic Energy Agency (IAEA) works with member states