​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The International RELAP5 User Group (IRUG) connects RELAP5 users in various countries in order to share strategies and best practices for RELAP5 modeling. IRUG membership is available to both RELAP5-3D and RELAP5/Mod 3.3 users.  IRUG members must be registered with their respective licensing agency, INL for RELAP5-3D and NRC for RELAP5/Mod 3.3. An important benefit of IRUG membership is participation in IRUG training and seminar presentations. 

I​f you would like to be added to the IRUG-2023 email distribution list, please email the ​​RELAP5-3D Project Coordinator​​.​​

2023 Meeting​ Announcement

Hotel room block information is provided below the meeting flier

Registration Information

Registration and payment is available via the IRUG Registration and Payment Page​



Book your group rate for IRUG

You will find the information for your online reservation link below. If you have questions or need help with the link, please do not hesitate to ask. We appreciate your business and look forward to a successful event. 

Event Summary:
IRUG
Start Date: Sunday, December 3, 2023
End Date: Friday, December 8, 2023
Last Day to Book: Sunday, November 12, 2023
Hotel(s) offering your special group rate (5 -10 minute drive from INL Facilities):
  • Residence Inn Idaho Falls for 107 USD per night
  • SpringHill Suites Idaho Falls for 107 USD per night

Book your group rate for IRUG