Document: NUREG-0800
Document ID: 786da65a-4915-4af3-afb3-678b7df5bea7
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070327.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
7 E (3) 1.7 D + 1.7 L + 1.7 W If thermal stresses due to T and R are present, the following 0 0 combinations should also be considered: (4) 1.3 (D + L + T + R ) 0 0 (5) 1.3(D + L + E + T + R ) 0 0 (6) 1.3 (D + L + W + T + R ) 0 0 (ii) For factored load conditions, the following load combinations should be considered: (a) If elastic working stress design methods are used: (1) D + L + T + R + E' 0 0 (2) D + L + T + R + W 0 0 t (3) D + L + T + R + P a a a (4) D + L + T + R + P + 1.0 (Y + Y + Y ) + E a a a r j m (5) D + L + T + R + P + 1.0 (Y + Y + Y ) + E' a a a r j m (b) If plastic design methods are used: (1) D + L + T + R + E' 0 0 (2) D + L + T + R + Wt 0 0 DRAFT Rev. 2 - April 1996 3.8.4-14 (3) D + L + T + R + 1.5 P a a a (4) D + L + T + R + 1.25 P + 1.0 (Y + Y +Y ) + 1.25 E a a a r j m (5) D + L + T + R + 1.0 P + 1.0 (Y + Y + Y ) + E' a a r j m In the above factored load combinations, thermal loads can be neglected when it can be shown that they are secondary and self-limiting in nature and where the material is ductile. In combinations II.3.c(ii)(b) (3), (4), and (5), the maximum values of P , 52 a T , R , Y , Y , and Y , including an appropriate dynamic load factor, a a j r m should be used unless a time-history analysis is performed to justify otherwise. Combinations II.3.c(ii)(b) (2), (4) and (5) and the 53 corresponding structural acceptance criteria of subsection II.5 of this SRP section should first be satisfied without the tornado missile load in (2) and without Y Y , and Y in (4) and (5). r j m When considering these concentrated loads, local section strength may be exceeded provided there will be no loss of function of any safety-related system. Where any load reduces the effects of other loads, the corresponding coefficient for that load should be taken as 0.9, if it can be demonstrated that the load is always present or occurs simultaneously with other loads. Otherwise, the coefficient for that load should be taken as zero. Where the structural effect