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:
ed differential pressure, and tornado-generated missiles. DRAFT Rev. 2 - April 1996 3.8.4-10 Abnormal loads, which are those loads generated by a postulated high-energy pipe break accident, include: P - Pressure equivalent static load within or across a compartment a generated by the postulated break, including an appropriate dynamic load factor to account for the dynamic nature of the load. T - Thermal loads under thermal conditions generated by the a postulated break, including T . 0 R - Pipe reactions under thermal conditions generated by the a postulated break, including R . 0 Y - Equivalent static load on the structure generated by the reaction on r the broken high-energy pipe during the postulated break, including an appropriate dynamic load factor to account for the dynamic nature of the load. Y - Jet impingement equivalent static load on a structure generated by j the postulated break, including an appropriate dynamic load factor to account for the dynamic nature of the load. Y - Missile impact equivalent static load on a structure generated by or m during the postulated break, as from pipe whipping, including an appropriate dynamic load factor to account for the dynamic nature of the load. In determining an appropriate equivalent static load for Y , Y , and Y , r j m elasto-plastic behavior may be assumed with appropriate ductility ratios, provided excessive deflections will not result in loss of function of any safety-related system. b. Load Combinations for Concrete Structures For concrete structures, the load combinations are acceptable if found in accordance with the following: (i) For service load conditions, either the working stress design (WSD) method, as outlined in the ACI 318 Code, or the strength design method may be used. (a) If the WSD method is used, the following load combinations should be considered: (1) D + L (2) D + L + E 3.8.4-11 DRAFT Rev. 2 - April 1996 (3) D + L + W If thermal stresses due to T and R are present, the following 0 0