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:
r the circumferential or longitudinal stresses derived on an elastically calculated basis under the loadings associated with seismic events and operational plant conditions exceed 0.8 (Sh+ SA)7 or the expansion stresses exceed 0.8 SA; and 3. Intermediate locations in addition to these determined by (2) above, selected on a reasonable basis as necessary to provide protection. As a minimum, there should be two intermediate locations for each piping run or branch run. 3. The criteria used to determine the pipe break orientation at the break locations as specified under (2) above should be equivalent to the following: BTP 3-3-10 Revision 3 - March 2007 a. Longitudinal8 breaks in piping runs and branch runs, 4 inches 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