Document: NUREG-0800
Document ID: a4232dd4-7548-4c1c-9a51-16dc766f1087
Document Type: srp
Title: Revision 2 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
ts, are performed to demonstrate compliance with the limits of 2.A(ii)(1). (3) The number of circumferential and longitudinal piping welds and branch connections should be minimized. Where guard pipes are used, the BTP 3-4-4 Revision 2 - March 2007 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 need 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% volumetrically examinable in service and a detailed stress analysis is performed to demonstrate compliance with the limits of 2.A(ii)(1). (6) Guard pipes provided for those portions of piping in the containment penetration areas should be constructed in accordance with the criteria of the ASME Code, Section III, Subsection NE, Class MC, where the guard pipe is part of the containment boundary. In addition, the entire guard pipe assembly should be designed to meet the following criteria and tests: (a) The design pressure and temperature should not be less than the maximum operating pressure and temperature of the enclosed pipe under normal plant conditions. (b) The Level C stress limits in, ASME Code, Section III, NE-3220 should not be exceeded under the loading associated with containment design pressure and temperature in combination with the safe shutdown earthquake. (c) Guard pipe assemblies should be subjected to a single pressure test at a pressure not less than its design pressure. (d) Guard pipe assemblies should not prevent the access necessary to conduct the inservice examination specified in 2.A(ii)(7).