Risk-Informed In-Service Inspection (RI-ISI) uses risk assessment in addition to information on component-specific degradation mechanisms to develop a cost-effective alternative to ASME Code Section XI inspection requirements. Structural Integrity Associates, Inc. (SI) played a key role in development of EPRI® NRC-approved RI-ISI and RIS_B© (Risk-Informed Safety-Based) methodologies, the latter a streamlined RI-ISI methodology codified in ASME Code Case N-716 that results in fewer inspections with no increase in plant risk. To date, SI has performed Code Case N-560 and N-578 evaluations using the EPRI RI-ISI methodology for nearly 30 PWRs and 10 BWRs. In all cases, the methodology was proven to significantly reduce the number of piping inspections, with negligible impact on plant risk. SI has also performed pilot plant studies, as well as several follow-on plant applications, using EPRI's RIS_B (Code Case N-716) methodology. Additionally, SI has experience in application of risk-informed technologies to Break Exclusion Region program piping, as well as in RI-ISI Living Program Updates, as part of Interval ISI Program Updates or as stand-alone evaluations.

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RIS_B is a trademark of the Electric Power Research Institute, Inc.