Document: NUREG-0800
Document ID: 645cc743-c9e4-428c-b05d-ead2517eb3fa
Document Type: srp
Title: DETERMINATION OF RUPTURE LOCATIONS AND DYNAMIC EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070315.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.2
CFR Part: 
CFR Title: 

Content:
iping welds and branch connections should be minimized. Where guard pipes are used, the enclosed portion of fluid system piping should be seamless construction and without circumferential welds unless specific access provisions are made to permit inservice volumetric examination of the longitudinal and circumferential welds. (4) The length of these portions of piping should be reduced to the minimum length practical. (5) The design of pipe anchors or restraints (e.g., connections to containment penetrations and pipe-whip restraints) should not require welding directly to the outer surface of the piping (e.g., flued integrally forged pipe fittings may be used), except where such welds are 100 percent% volumetrically 65 examinable in service and a detailed stress analysis is performed to demonstrate compliance with the limits of B.1.b(1). (6) Guard pipes provided for those portions of piping in the containment penetration areas should be constructed in accordance with the rules of Class MC, Subsection NE of the ASME Code, Section III, where the guard pipe is part of the containment boundary. In addition, the entire Extremities of piping runs that connect to structures, components (e.g., vessels, pumps, 23 valves), or pipe anchors that act as rigid constraints to piping motion and thermal expansion. A branch connection to a main piping run is a terminal end of the branch run, except where the branch run is classified as part of a main run in the stress analysis and is shown to have a significant effect on the main run behavior. In piping runs which are maintained pressurized during normal plant conditions for only a portion of the run (i.e., up to the first normally closed valve), a terminal end of such runs is the piping connection to this closed valve. Stress range under those loads and conditions thereof for which level A and level B stress 4 limits have been specified in the system's Design Specification, including an OBE event per paragraph NB-3653 of the ASME