Document: NUREG-0800
Document ID: 89a50aec-b387-4999-9c8e-3b8e4f289a55
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800027.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
include those systems where either of the following conditions are met: (a) the maximum operating temperature exceeds 200EF, and (b) the maximum operating pressure exceeds 275 psig. 2 Moderate energy systems include those systems where both of the following conditions are met: (a) the maximum operating temperature is 200EF or less, and (b) the maximum operating pressure is 275 psig or less. 3 Structures, systems, and components important to safety, as specified herein refer to those plant features required to shut down the reactor safely and maintain the plant in the cold shutdown condition. 4 Break 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. 5 Either circumferential or longitudinal stresses derived on an elastically-calculated basis. 6 Specified seismic events are earthquakes that produce at least 50 percent of the vibratory motion of the Safe Shutdown Earthquake (SSE). 7 Operational plant conditions include normal reactor operation, upset conditions, (e.g., anticipated operational occurrences) and testing conditions. 8 Sh 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. 9 Terminal 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. 10 These 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