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:
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 in SRP Section 3.5.3. d. After procedures for determining the individual tornado effects are reviewed, the manner in which these effects are then combined to arrive at the most adverse total tornado effect is reviewed and compared with the acceptance criteria delineated in subsection II.3.d. Other proposed methods which may depend upon the geometry and confi- guration of a particular structure are reviewed on a case-by-case basis. 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 is reviewed to assure that one of the acceptance criteria of subsection II.4 is satisfied. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided to satisfy the requirements of this SRP section, and concludes that his evaluation is sufficiently complete and adequate to support the following type of statement to be included in the staff's safety evaluation report. 3.3.-2-4 Rev 2 - July 1981 The staff concludes that the plant design is acceptable and meets the requirements of General Design Criterion 2. This conclusion is based on the following: The applicant has met the requirements of GDC 2 with respect to the structure capability to withstand design tornado wind loading and tornado missiles so that their design reflects 1. appropriate consideration for the most severe tornado recorded for the site with an appropriate margin; 2. appropriate combinations of the effects of normal and accident conditions 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,