Document: NUREG-0800
Document ID: 6d9458c8-25fc-47c7-8406-acd4365b1d3c
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A472.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
CFR Part: 
CFR Title: 

Content:
sion 4. The various criteria, described in general terms above, should be supplied along with the names of the apparatus to which the criteria apply. Pressurized portions of the system that are a part of the RCPB are reviewed to determine the extent to which the applicant complies with the Class 1 requirements of Section III of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPV Code). Those portions that are not part of the RCPB are reviewed for compliance with other specified parts of Section III, or other sections of the ASME BPV Code. The non-pressurized portions of the CRDS are reviewed to determine the acceptability of design margins for allowable values of stress, deformation, and fatigue used in the analyses. For CRDS internal to the vessel assembly, the review includes the mechanical components of the CRDS, as well as the power cables and their connections to any direct current motors and electromagnetic or hydraulic actuators in the CRDM assemblies. If an experimental testing program is used in lieu of analysis, the program is reviewed to determine whether it adequately addresses stress, deformation, and fatigue. Whether analysis or testing is used to support the CRDS design, it should be based on the limiting plant operating conditions with worst-case static and alternating loads. 3. A review of applicable design loads (static and alternating) and their appropriate combinations, the corresponding design stress and fatigue limits, and the corresponding allowable deformations is performed. The deformations are of interest in the present context only in those instances where a failure of movement due to excessive static or oscillating deformation could be postulated and such movement would be necessary for a safety-related function. If applicable, fatigue assessments, primarily of connections between CRDS components, should be performed to ensure the assembly maintains integrity throughout the design life of the plant. If