Document: NUREG-0800
Document ID: 92d817ac-3ce3-4cf7-8d1a-627e8242fbf2
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070312.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
nd do not c. preclude consideration of other aspects of the NRC General Design Criteria, such as single failure criteria and other additional protective measures required to provide protection against environmental conditions incident to postulated accidents.61 Structures, systems, and components important to safety, as specified herein refer to 3d. those plant features required to shut down the reactor safely and maintain the plant in the cold shutdown condition. Break in piping means (a) a complete circumferential pipe severance and, (b) a 4e. 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. Terminal ends of pipe runs originate at points of maximum constraint (e.g., connections f. 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.62 Either circumferential or longitudinal stresses derived on an elastically-calculated basis. 5g. Specified seismic events are earthquakes that produce at least 50 percent of the vibratory 6h. motion of the Safe Shutdown Earthquake (SSE). 3.6.1-31 DRAFT Rev. 3 - April 1996 Operational plant conditions include normal reactor operation, upset conditions, 7i. (e.g., anticipated operational occurrences) and testing conditions. S is the allowable stress at maximum temperature, and S is the allowable stress range 8j. h A for expansion stresses for Class 2 and 3 piping as permitted by the rules of ASME Code Section III. Terminal ends of pipe runs originate at points of maximum constraint (e.g., connections 9 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.63 These criteria are intended for the purpose of designing piping restraints and do not 10 preclude