Document: NUREG-0800
Document ID: d2857477-655b-4e97-aa7c-3321de2d556e
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190004.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of component performance and testing Secondary - None I. AREAS OF REVIEW The control rod drive system (CRDS) consists of the control rods and the related mechanical components which provide the means for mechanical movement. 10 CFR Part 50, Appendix A, General Design Criteria (GDC) 26 and 27 require that the CRDS provide one of the independent reactivity control systems. The rods and the drive mechanism shall be capable of reliably controlling reactivity changes under conditions of normal operation, including anticipated operational occurrences, and under postulated accident conditions. A positive means for inserting the rods shall always be maintained to ensure appropriate margin for malfunction, such as stuck rods. Since the CRDS is important to safety and portions of the CRDS are a part of the reactor coolant pressure boundary (RCPB), GDC 1, 2, 14, and 29 and 10 CFR 50.55a require that the system be designed, fabricated, and tested to quality standards commensurate with the safety functions to be performed so as to assure an extremely high probability of accomplishing the safety functions in the event of anticipated operational occurrences, postulated accidents and natural phenomena such as earthquakes. 3.9.4-2 Revision 3 - March 2007 Information in the areas noted below is provided in the applicant’s safety analysis report and is reviewed by the primary review branch in accordance with this standard review plan (SRP) section. This information pertains to the CRDS, which is considered to extend to the coupling interface with the reactivity control elements in the reactor pressure vessel. For electromagnetic systems, the review under this SRP section is limited to just the control rod drive mechanism (CRDM) portion of the CRDS. For hydraulic systems, the review covers the CRDM and also the hydraulic control unit, the condensate supply system, and the scram discharge volume. For both types