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:
d Load Combinations The loads and load combinations shall include consideration of normal loads, severe environmental loads, extreme environmental load, and abnormal loads. Specifically, for operating plants, the load combinations provided in the plant's FSAR shall govern. For operating license applications, The following load combinations shall apply (for 110 definition of load terms, see SRP Section 3.8.4, subsection II.3). (a) Service Load Conditions (1) D + L (2) D + L + E (3) D + L + W 3.8.4-25 DRAFT Rev. 2 - April 1996 If thermal stresses due to T and R are present, they should be included in the 0 0 above containmentcombinations, as follows: 111 (1a) D + L + T + R 0 0 (1b) D + L + T + R + E 0 0 (1c) D + L + T + R + W 0 0 Check load combination for controlling condition for maximum 'L' and for no 'L'. (b) Extreme Environmental, Abnormal, Abnormal/Severe Environmental, and Abnormal/Extreme Environmental Conditions (4) D + L + T + R + E' 0 0 (5) D + L + T + R + W 0 0 t (6) D + L + T + R + 1.5 P a a a (7) D + L + T + R + 1.25 P + 1.0 (Y + Y + Y ) + 1.25 E a a r j m (8) D + L + T + R + 1.0 P + 1.0 (Y + Y + Y ) + 1.0 E' a a a r j m In combinations (6), (7), and (8) the maximum values of P , T , R , Y , Y , and a a a r j Y , including an appropriate dynamic load factor, should be used unless a m time-history analysis is performed to justify otherwise. Combinations (5), (7), and (8) and the corresponding structural acceptance criteria of should be satisfied first without the tornado missile load in (5) and without Y , Y , and Y in (7) and r j m (8). When considering these loads, local section strength 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. 3. Allowable Stresses Allowable stresses provided in ACI-531-79, as supplemented by the following modifications/exceptions, shall apply. (a) When wind or