Document: NUREG-0800
Document ID: f07feb9e-0113-4ab4-b79b-ecfb1f8b791a
Document Type: srp
Title: RELIABILITY ASSURANCE PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1329/ML13296A435.pdf
Revision Date: 2023-06
Chapter: 17
Section ID: 17.4
CFR Part: 
CFR Title: 

Content:
an unacceptable level of reliability, availability, or condition during plant operations. • The frequency of transients that challenge these SSCs is minimized. • These SSCs will function reliably when challenged. The RAP is implemented in two stages. The first stage, the design reliability assurance program (D-RAP), encompasses reliability assurance activities that occur before initial fuel load. The second stage comprises the reliability assurance activities conducted during the operations phase of the plant’s license. The objective of the D-RAP is to ensure that the plant is designed and constructed in a manner that is consistent with the risk insights and key assumptions (e.g., SSC design, reliability, and availability) from the probabilistic, deterministic, and other methods of analysis used to identify and quantify risk.1 Therefore, the key features of the D-RAP include the following: • Programmatic controls2 that ensure the risk insights and key assumptions are consistent with the plant design and construction. These programmatic controls address organization responsibilities, design control activities, procedures and instructions, records, corrective action and assessment plans, and that the list of RAP SSCs is appropriately developed, maintained, and communicated to the appropriate organizations. • Quality assurance (QA) programs related to design and construction activities (e.g., design, procurement, fabrication, construction, inspection, and testing activities) to 1 D-RAP should not be interpreted as a numerical analysis that would require the estimated reliability of each as-built RAP SSC to be at least equal to the reliability assumed in the PRA. D-RAP should not be based solely on numerical values. For one reason, the estimated reliability of each as-built RAP SSC and the reliability assumed in the PRA may be highly uncertain. For another, the basis for the estimated reliability of each as-built RAP SSC may be the same as, or very similar