Document: NUREG-0800
Document ID: dac334d4-585f-42f5-bde4-118e876f5d4c
Document Type: srp
Title: PIPING SYSTEMS AND COMPONENTS (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070660.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.3
CFR Part: 
CFR Title: 

Content:
s, the function of these other welds is needed for protection of safety-related systems, structures, and components but are not directly involved (or are redundant) in preventing an accident or event. Accordingly, these other types of welding were deemed inappropriate for Tier 1 scope. HYDROSTATIC TEST The integrity of the pressure boundary is required to be maintained because it is directly involved in preventing or mitigating an accident or event under the defense-in-depth principle. The pressure boundary integrity will also be ensured, in part, through a hydrostatic test verifying 14.3.3-7 DRAFT Rev. 0 - April 1996 the leak-tightness of the ASME Code piping systems. A hydrostatic test is generally specified by the ASME Code, Section III, for ASME Code Class 1, 2, and 3 SSCs. This test verifies that pressure integrity is maintained in the process of fabricating the overall piping system, including any welding and bolting requirements. However, the ASME piping stress report in the generic piping ITAAC described above does not include the results of hydrostatic tests. Therefore, the standard ITAAC for hydrostatic test in Appendix D to SRP Section 14.3 should be required in each system ITAAC that contains ASME Code class 1, 2, or 3 SSCs. The hydrostatic test ITAAC may also be required in other appropriate Tier 1 systems. EQUIPMENT SEISMIC AND DYNAMIC QUALIFICATION The basic configuration ITAAC listed in Appendix D to SRP Section 14.3 includes verifications of the dynamic qualification (e.g., seismic, LOCA, and safety relief valve discharge loads) of seismic Category I mechanical and electrical equipment (including connected instrumentation and controls) described in the design descriptions and figures. This inspection verifies the ability of mechanical and electrical equipment in its as-built condition, including anchorages, to perform their safety functions during and following a safe shutdown earthquake. Detailed supporting information for dynamic qualification