Document: NUREG-0800
Document ID: 808cea66-69b8-4f91-9fb2-62b3b99bc87a
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340579.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
- . Both cases of L having its full value or being completely absent should be checked. (b) If the strength design method is used, the following load combinations should be considered: (1) 1.4D + 1.7L (2) 1.4D + 1.7L + 1..9E If thermal stresses due to T and R are present, the following combinations shoulB also Be considered: (3) (0.75) (1.40 + 1.7L + 1.7T1` + 1.7Ro) (4) (0.75) (1.4D + 1.7L + 1.9E + 1.7T0 + 1.7RO) (ii) For factored load conditions, which represent extreme environmental, abnormal, abnormal/severe environmental, and abnormal/extreme environmental conditions, the strength design method should be used and the following load combinations should be considered: (1) D + L + To + Ro + E' (2) D + L + Ta + Ra + 1.5 Pa (3) D + L + Ta + Ra + 1.25 Pa + 1-0 (Yr + Yj + Ym) + 12 5E (4) + L + Ta + Ra + 1-0 a + 1-0 (Y + Y. m)+l E In combinations (2), (3), and (4), the maximum values of P. T , R Y., Y , and Y , including an appropriate dynamic lBad factor, sAoulb be useW unless a time-history analysis is per- formed to 4ustify otherwise. Combinations (3) and (4) and the corresponding structural acceptance-criteria of subsection II.5 of this SRP section should first be'satisfied without Y Y .and Y . When considering these loads, local section stFengUh capacities may be exceeded under these concentrated loads, provided there will be no loss of function of any safety- related system. Both cases of L having its full value or being completely absent should be checked. c. Load Combinations for Steel Structures For steel Interior structures, the load combinations are acceptable if found in accordance with the following: (i) For service load conditions, either the elastic working' stress design methods for Part 1 of AISC, or the plastic design methods of Part 2 of AISC, may be used. (a) If the elastic working stress design methods are used: 3.8.3-17 Rev. 1 - July 1981 (1) D + L (2) D + L + E If thermal stresses due to T and R are present, the following combinations shoulB be