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:
e break orientation at the break locations as specified under (2) above should be equivalent to the following: (a) Longitudinal 8 breaks in piping runs and branch runs, 4 :%.ches nominal pipe size and larger, and/or (b) Circumferential9 breaks in piping runs and branch runs exceeding 1 inch nominal pipe size. 4. A summary should be provided of the dynamic analyses applicable to the design of Category I piping and associated supports which determine the resulting loadings as a result of a postulated pipe break including: (a) The locations and number of design basis breaks on which the dynamic analyses are based. (b) The postulated rupture orientation, such as a circumferential and/or longitudinal break(s), for each postulated design basis break location. (c) A description of the forcing functions used for the pipe whip dynamic analyses including the direction, rise time, magnitude, duration and initial conditions that adequately represent the jet stream dynamics and the system pressure difference. (d) Diagrams of mathematical models used for the dynamic analysis. (e) A summary of the analyses which demonstrates that unrestrained motion of ruptured lines will not damage to an unacceptable degree, structures, systems, or components important to safety, such as the control room. 5. A description should be provided of the measures, as applicable, to protect against pipe whip, blowdown jet and reactive forces including: (a) Pipe restraint design to prevent whip impact; (b) Protective provisions for structures, systems, and components required for safety against pipe whip and blowdown jet and reactive forces; (c) Separation of redundant features; (d) Provisions to separate physically piping and other components of redundant features; and (e) A description of the typical pipe whip restraints and a summary of number and location of all restraints in each system. 6. The procedures that will be used to evaluate the structural adequacy of Category I structures and to design new