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:
Design CRDS. Also, mechanical and acoustic pulsations from other major reactor components, including valves and reactor recirculation pumps (RRPs), should be considered in the CRDS design. Evaluation of flow-induced loads is performed under SRP Section 3.9.2, “Dynamic Testing and Analysis of Systems, Structures, and Components,” and Regulatory Guide (RG) 1.20, “Comprehensive Vibration Assessment Program for Reactor Internals During Preoperational and Initial Startup Testing,” Revision 4. If other types of CRDS are proposed or if new features that are not specifically mentioned here are incorporated into the CRDS of current types, the information supplied for the new systems or new features should be similar to the information described below. The specific areas of review are as follows: 1. The descriptive information, including design criteria, testing programs, drawings, and a summary of the method of operation of the control rod drives, is reviewed to permit an evaluation of the adequacy of the system to perform its mechanical function properly. 2. A review is performed of design codes, standards, specifications, and standard practices, as well as GDC, regulatory guides, and branch positions that apply to the design, fabrication, construction, and operation of the CRDS. The close proximity of all major plant components in small modular reactor (SMR) designs and the immersion of the CRDS within some SMR concepts could lead to alternating loading not previously considered. Therefore, a review is also performed of the overall reactor operation, and a matrix of all potential alternating flow, acoustic, and mechanical loads on the CRDS is 3.9.4-3 Revision 4 – March 2017 developed. Details of such potential loads are provided in SRP Section 3.9.2 and RG 1.20 Revision 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