What's New in the 2021 Update

Changes to Web Site Content

Starting from the 2016 Update, the schedule for performing component and system study updates is every other year, while the loss of offsite power and initiating event updates are still done each year. As such, the 2018 and 2020 Updates included the studies for loss of offsite power, initiating event, component, and system studies using data through calendar year 2018 or 2020; the 2019 and this update (i.e., the 2021 Update) included only the studies for loss of offsite power and initiating event using data through calendary year 2019 or 2021.

The parameters used in the SPAR models have been updated using data through calendar year 2020. The 2020 SPAR parameter update includes initiating event frequencies, component unreliability, component unavailability, common cause failure alpha factors, and loss of offsite power nonrecovery probabilities. The next update is planned to use data through calendar year 2025 and will be conducted around 2026.

Historical Update Summaries

• Whats New in 2020 (Summary of Analyses and Significant Trends for 2020)
  
• Whats New in 2019
• Whats New in 2018 (Summary of Analyses and Significant Trends for 2018)
  
• Whats New in 2017 (Summary of Analyses and Significant Trends for 2017)
  
• Whats New in 2016 (Summary of Analyses and Significant Trends for 2016)
  
• Whats New in 2015 (Summary of Analyses and Significant Trends for 2015)
  
• Whats New in 2014 (Summary of Analyses and Significant Trends for 2014)
  
• Whats New in 2013 (Summary of Analyses and Significant Trends for 2013)
  
• Whats New in 2012 (Summary of Analyses and Significant Trends for 2012)
  
• Whats New in 2011 (Summary of Analyses and Significant Trends for 2011)
  
• Whats New in 2010 (Summary of Analyses and Significant Trends for 2010)
  
• Whats New in 2009