Document: NUREG-0800
Document ID: 5cd0267e-b1ef-4ddb-8204-aac45ea7ac13
Document Type: srp
Title: 2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070301.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4.5
CFR Part: 
CFR Title: 

Content:
effective reduced pressure, the acceptance criteria are established on a case-by-case basis, upon request, by the Auxiliary Systems Branch (ASB)SPLB.21 c. The acceptance criteria for transforming the tornado-generated missile impact into an effective or equivalent static load on structures are delineated in subsection II of SRP Section 3.5.3. d. Having established the effective loads for each of the above three individual tornado-generated effects, the combination thereof should then be determined in a conservative manner for each particular structure, as applicable. An acceptable method of combining these effects is as follows: (i) W = W t w (ii) W = W t p (iii) W = W t m (iv) W = W + .5 W t t p (v) W = W + W t t m (vi) W = W + .5 W + W t t p m where: W total tornado load, t W tornado wind load, w W tornado differential pressure load, and p W tornado missile load. m For each particular structure or portion thereof, the most adverse of the above combinations should be used, as appropriate. These combined effects constitute the total tornado load which should then be combined with other loads as specified in SRP Sections 3.8.1, 3.8.4, and 3.8.5. 4. 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 acceptable if found in accordance with either of the following: a. The postulated collapse or structural failure of structures and components 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. 3.3.2-5 DRAFT Rev. 3 - April 1996 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. Technical Rationale22 The technical rationale for application of these