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:
.9.3. The stress limits applicable to pressurized and nonpressurized portions of the CRDS should be as given in SRP Section 3.9.3 for the response to each loading set. For BWRs, the CRDS design should adequately consider water hammer loads to assure that system safety functions can be achieved. 3. The operability assurance program will be acceptable provided the observed performance as to wear, functioning times, latching, and ability to overcome a stuck rod meet system design requirements. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 1 and 10 CFR 50.55a establish requirements regarding the quality standards to be applied to the CRDS. Specifically, 10 CFR 50.55a identifies the ASME Code requirements, Code editions, and addenda that must be applied to pressure-retaining portions of the CRDS that are of the highest importance to safety. RG 1.26 identifies acceptable standards to be applied for pressure-retaining portions of the CRDS that are of lower safety significance but which may contain radioactive material. The CRDS is an independent reactivity control system designed to ensure the capability to control reactivity changes in the reactor under normal operating and accident conditions. The fuel cladding and RCPB are protected by CRDS safety functions, including insertion of adequate negative reactivity to preserve these fission product barriers under specified conditions. In addition, CRDS designs may comprise a portion of the RCPB and provides a barrier to the release of fission products. The application of GDC 1 and 10 CFR 50.55a requirements to the design, fabrication, installation, and testing ensures the CRDS meets quality standards that are adequate to provide assurance that these safety functions will be performed. 2. GDC 2 establishes requirements regarding the ability of the CRDS to withstand the effects of an