Document: NUREG-0800
Document ID: e89cc26c-d19a-42b8-818a-fb598c05ccee
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN FLUID
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340548.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
to those plant features required to shut down the reactor safely and maintain the plant in the cold shutdown condition. 4Break in piping means (a) a complete circumferential pipe severance and, (b) a longitudinal split opening an area equal to the pipe area, but without pipe severance. Such breaks are assumed to occur at each specified break location, but not concurrently. 5Either circumferential or longitudinal stresses derived on an elastically- calculated basis. 6Specified seismic events are earthquakes that produce at least 50 percent of the vibratory motion of the Safe Shutdown Earthquake (SSE). 7Operational plant conditions include normal reactor operation, upset conditions, (e.g., anticipated operational occurrences) and testing conditions. 8Sh is the allowable stress at maximum temperature, and SA is the allowable stress range for expansion stresses for Class 2 and 3 piping as permitted by the rules of ASME Code Section III. 9Terminal ends of pipe runs originate at points of maximum constraint (e.g., connections to vessels, pumps, valves, fittings that are rigidly anchored to structures) terminal ends of branch runs originate at pipe intersections and components that act as rigid constraints. 10These criteria are intended for the purpose of designing piping restraints and do not preclude consideration of other aspects of the AEC General Design Criteria, such as single failure criteria and other additional protective measures required to provide protection against environmental conditions incident to postulated accidents. 3.6.1-27 Rev. 2 - October 1990