Activity characterization and waste management in the FiR1 TRIGA decommissioning project

Antti Räty, Santeri Vento, Markus Airila

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional


FiR1 TRIGA research reactor was in operation from 1962 until 2015 and its dismantling was finalized in March 2024. All LILW nuclear waste generated from the dismantling project will be sent for final disposal to Loviisa NPP site, operated by power company Fortum. This requires careful waste activity characterization to fulfill Loviisa’s waste acceptance criteria.
Activity characterization of the FiR1 project is based on both calculations and measurements. Preliminary results were calculated with MCNP and ORIGEN-S codes. These have been further validated and refined during the project by sample measurements to form material-wise nuclide vectors. Finally, the packed waste is characterized with the ISOCS gamma spectrometric measurement setup.
We describe the characterization methods, how they we utilized throughout the process and how the characterization results were reviewed and assessed. We also introduce specific challenges related to characterizing TRIGA research reactors and the connections with other aspects in decommissioning planning.
Original languageEnglish
Title of host publicationEuropean Research Reactor Conference RRFM2024 - Proceedings
PublisherEuropean Nuclear Society (ENS)
Number of pages8
ISBN (Electronic)978-92-95064-40-9
Publication statusPublished - 2024
MoE publication typeD3 Professional conference proceedings
EventEuropean Research Reactor Conference, RRFM 2024 - Warsaw, Poland
Duration: 21 Apr 202425 Apr 2024


ConferenceEuropean Research Reactor Conference, RRFM 2024


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