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:
will not affect the capability of other structures or components to perform necessary safety functions, is acceptable if found in accordance with either of the following: a. The postulated collapse or structural failure of structures and com- ponents not designed for tornado loads, including missiles, can be shown not to result in any structural or other damage to safety- related structures or components. 3.3.2-3 Rev 2 - July 1981 b. Safety-related structures are designed to resist the effects of the postulated structural failure, collapse, or generation of missiles from structures and components not designed for tornado loads. III. REVIEW PROCEDURES The reviewer selects and emphasizes material from the review procedures described below, as may be appropriate for a particular case. 1. The site-related parameters described in subsection I.1. are reviewed by the Accident Evaluation Branch (AEB) in accordance with SRP Sections 2.3.1, 2.3.2, and 3.5.1.4. The structural reviewer examines the approved values of these parameters to assure that they are consistent with those contained in the SRP sections stated above. 2. After the acceptability of the site-related parameters is established, the SEB reviewer proceeds with his review of the structural aspects of tornado design in the following manner: a. The procedures used by the applicant to transform tornado wind veloc- ities into effective pressures are reviewed and compared with those procedures delineated in either ASCE Paper No. 3269 or in ANSI A58.1, whichever is selected, and, in particular, with the acceptance criteria delineated in subsection II.3.a. b. Where venting is used, procedures for transforming the tornado- generated differential pressure into an effective reduced pressure are reviewed, upon request, by the Auxiliary Systems Branch (ASB) upon SEB request. c. The treatment of tornado-generated missiles is covered in SRP Section 3.5.1.4 and the review procedures for design of missile barriers are described