Document: NRC Regulatory Guide
Document ID: cdc706d5-60ed-40a4-b55a-9771904107a7
Document Type: regulatory_guide
Title: Seismic Qualification of Electric and Mechanical Equipment for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1809/ML18093A675.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.100
CFR Part: 
CFR Title: 

Content:
pendix QR-B, “Guide for Qualification of Nonmetallic Parts” • Section QDR, “Qualification of Dynamic Restraints,” and its Mandatory Appendix QDR-I, “Qualification Specification for Dynamic Restraints;” Nonmandatory Appendix QDR-A, “Restraint Similarity;” and Nonmandatory Appendix QDR-B, “Typical Values of Restraint Functional Parameters” • Section QP, “Qualification of Active Pump Assemblies,” and its Mandatory Appendix QP-I, “Qualification Specification for Active Pump Assemblies;” Nonmandatory Appendix QP-D, “Pump Similarity Checklist;” and Nonmandatory Appendix QP-E, “Guidelines for Shaft-Seal System Material and Design Consideration” • Section QV, “Functional Qualification Requirements for Active Valve Assemblies for Nuclear Facilities,” and its Mandatory Appendix QV-I, “Qualification Specification for Active Valves,” and Nonmandatory Appendix QV-B, “Static Side Load Testing for Power-Actuated and Relief Valve Assemblies” • Section QVG, “Guide to Section QV: Determination of Valve Assembly Performance Characteristics” The major change from ASME QME-1-2007 to ASME QME-1-2017, in terms of the functional qualification of mechanical equipment, is the incorporation of lessons learned from the qualification of active mechanical equipment since the publication of ASME QME-1-2007. In the 1980s and 1990s, operating experience at NPPs revealed a number of weaknesses in the initial design, qualification, testing, and performance of motor-operated valves (MOVs). For example, DG-1328, Page 7 some engineering analyses used in the original sizing and setting of MOVs inadequately predicted the thrust and torque for opening and closing valves under design-basis conditions. Similarly, some testing methods used to measure valve stroke times under zero differential pressure and flow conditions did not detect deficiencies that could prevent MOVs from performing their safety functions under design-basis conditions. Both