Document: NUREG-0800
Document ID: 274f0789-5956-4979-b7da-3b44ddf985d4
Document Type: srp
Title: TORNADO LOADS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570002.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.3.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for structural analysis reviews Secondary - None I. AREAS OF REVIEW The following areas are related to the design of structures that must withstand the effects of the specified design-basis tornado for the plant. These areas are reviewed to ensure conformance with 10 CFR 50, Appendix A, General Design Criterion (GDC) 2. The specific areas of review are as follows: 1. The design parameters applicable to the tornado, including the tornado wind translational and rotational speeds; the tornado-generated atmospheric pressure change; and the spectrum of tornado-generated missiles, including their characteristics, from the standpoint of use in defining the input parameters for the structural design criteria appropriate to account for tornado loads. 2. The procedures that are used to transform tornado parameters into effective loads on structures, including the following: A. The transformation of tornado wind into equivalent loads applied to structures, taking into consideration the geometrical configuration and physical 3.3.2-2 Revision 3 - March 2007 characteristics of the structures and the distribution of tornado wind pressure on structures. B. The transformation of tornado-generated atmospheric pressure changes into applied loads on structures. C. The transformation of tornado-generated missiles, which are impactive dynamic loads, into equivalent loads on structures. D. The combination of the above individual loads in a manner that will produce the most adverse total tornado effect on structures. 3. The information provided to demonstrate that failure of any structure or component not designed for tornado loads will not affect the capability of other structures or components to perform necessary safety functions. 4. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the staff reviews the applicant's proposed ITAAC associated with the