Document: NUREG-0800
Document ID: 5c84a1c2-9405-4849-8c5f-415a0bb66a22
Document Type: srp
Title: in connection with reactor internals.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070337.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.5
CFR Part: 
CFR Title: 

Content:
of individual loads and the appropriate combination of these loads (i.e., sustained loads, loads due to system operating transients (SOT) , 141 OBE, SSE, LOCA, DBPB, MS/FWPB and their dynamic effects) shallshould142 be in accordance with Section 1.3. The appropriate method of combination of these loads shallshould be in accordance with NUREG-0484, "Methodology for 143 Combining Dynamic Loads." (Reference 9). Exemptions that have been 144 permitted from regulatory requirements to use OBE and the acceptable alternative to use of OBE in the design of components, component supports, and core support structures are described in subsection III.1 of this SRP section.145 3.9.3-23 DRAFT Rev. 2 - April 1996 1.3 Service Conditions 1.3.1 Service Limit A Class 1, 2, and 3 components, component supports, and Class CS core 146 support structures shall meet a service limit not greater than Level A when subjected to sustained loads resulting from normal plant/system operation. 1.3.2 Service Limit B Class 1, 2, and 3 components, component supports, and Class CS core 147 support structures shall meet a service limit not greater than Level B when subjected to the appropriate combination of loadings resulting from (1) sustained loads, (2) specified plant/system operating transients (SOT), and (3) the OBE. Exemptions that have been permitted from regulatory requirements to use OBE and the acceptable alternative to use of OBE in the design of components, component supports, and core support structures are described in subsection III.1 of this SRP section.148 1.3.3 Service Limit C (a) Class 1, 2, and 3 components, component supports, and Class CS core support structures shall meet a service limit not greater 149 than Level C when subjected to the appropriate combination of loadings resulting from (1) sustained loads, and (2) the DBPB. (b) The DBPB includes loads from the postulated pipe break, itself, and also any associated system transients or dynamic effects resulting from the