Reactor Operational Experience Results and Databases

This area contains updated results for a variety of previously published studies conducted by the Office of Nuclear Regulatory Research.

  • The Loss of Offsite Power and Initiating Events updates are performed and made available yearly. The latest updates using data through calendar year 2021 are now available. The next updates that use data through calendar year 2022 will be conducted in 2023.
  • The Component Performance and System Studies updates for component and system reliability and trending analysis are performed and reported every other year since 2016. The latest updates using data through calendar year 2020 are now available. The next updates will use data through calendar year 2022 will be conducted in 2023.
  • The Industry Average Parameter Estimates and Common-Cause Failure Parameter Estimates used in the SPAR models are updated every four or five years, which include initiating event frequencies, component unreliability, component unavailability, common cause failure alpha factors, and loss of offsite power nonrecovery probabilities. The latest updates using data through calendar year 2020 are now available. The next updates are planned to use data through calendar year 2025 and will be conducted around 2026.

Summary

Parameter Estimates

Trends and Insights

Supplemental Information

Databases and Programs

Page Last Reviewed/Updated Wednesday, August 31, 2022