Document: NUREG-0800
Document ID: df28a5de-563d-4e9d-89a2-3436e072c82c
Document Type: srp
Title: TORNADO LOADINGS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340625.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.3.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILTIES Primary - Structural Engineering Branch (SEB) Secondary - None I. AREAS OF REVIEW The following areas relating to the design of structures that have to withstand the effects of the design basis tornado specified for the plant are reviewed to assure conformance with the requirements of General Design Criterion 2 (Ref. 1). 1. The design parameters applicable to the tornado, including the tornado wind translational and tangential velocities, the tornado-generated pressure dif- ferential and its associated time interval, and the spectrum of tornado- generated missiles including their characteristics, are reviewed from the standpoint of use in definingthe input parameters for the structural design criteria appropriate to account for tornado loadings. The bases for the selection and the values of these parameters are within the review responsi- bility of the Accident Evaluation Branch (AEB) as stated in SRP Sections 2.3.1, 2.3.2, and 3.5.1.4. 2. The procedures that are utilized to transform the tornado parameters into effective loads on structures are reviewed, including the following: a. The transformation of the tornado wind into an effective pressure applied to structures, taking into consideration the geometrical configuration and physical characteristics of the structures and the distribution of wind pressure on the structures. b. If venting of a structure is used, the procedures for transforming the tornado-generated differential pressure into an effective reduced pres- sure are reviewed by the Auxiliary Systems Branch (ASB) upon SEB request. Rev. 2 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and