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:
onditions with the effects of the natural phenomena; and 3. the importance of the safety function to be performed. The applicant has met these requirements by using ANSI A58.1 and ASCE paper No. 3269, which the staff has reviewed and found accept- able, to transform the wind velocity generated by the tornado into an effective pressure on structures and for selecting pressure coefficients corresponding to structures geometry and physical configuration. The applicant has designed the plant structures with sufficient margin to prevent structural damage during the most severe tornado loadings that have been determined appropriate for the site so that the requirements of Item 1 listed above are met. In addition, the' design of seismic Category I structures, as required by Item 2 listed above, has included in an acceptable manner, load combinations which occur as a result of the most severe tornado wind load and the loads resulting from normal and accident conditions. The procedures utilized to determine the loadings on structures' induced by the design basis tornado specified for the plant are acceptable since these procedures have been used in the design of conventional structures and proven to provide a conservative basis which together with other engineering design considerations assures that the structures withstand such environmental forces. The use of these procedures provides reasonable assurance that in the event of a design basis tornado, the structural integrity of the plant structures that have to be designed for tornadoes will not be impaired and, in consequence, safety-related systems and components located within these structures will be adequately protected and may be expected to perform necessary safety functions as required, thus satisfying the requirement of item 3 listed above. V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plans for using this SRP section. Except in those cases in