This international workshop is organised by the NEA, the International Atomic Energy Agency (IAEA) and the European Commission’s Joint Research Centre (JRC). Its goal is to collaboratively develop a comprehensive taxonomy of fuel-cycle options for molten salt reactor (MSR) technologies, covering chloride and fluoride-based salts, and to establish a clear, unified terminology for communicating these complex processes​. The effort builds on the MSR taxonomy from the 2023 IAEA‑TRS‑489 report on molten salt reactor technology​.

By combining the strengths of all three organizations, the workshop seeks to optimise technical expertise, ultimately advancing the roadmap toward MSR deployment and support in policy development.

The need for a harmonised fuel-cycle taxonomy and terminology was identified at the IAEA-OECD/NEA workshop on MSR chemistry (Oct 2023). The OECD/NEA Expert Group on Fuel Recycling and Waste Technology (EGFRW), and the IAEA Technical Working Group on Nuclear Fuel Cycle Options and Spent Fuel Management, endorsed the joint activity. Participation by the EC/JRC further strengthens the initiative.

In order to be designated by an IAEA Member State or invited organisation, participants are requested to submit their application via the InTouch+ platform (https://intouchplus.iaea.org) to the competent national authority (Ministry of Foreign Affairs, Permanent Mission to the IAEA or National Atomic Energy Authority) or organisation for onward transmission to the IAEA by 6 August 2025.

Abstract (5 pages maximum) deadline: 6 August 2025 – submit via IAEA-INDICO

Notification of acceptance: 11 September 2025

The workshop welcomes technical contributions and participants will also be encouraged to engage actively in drafting sessions to shape the taxonomy and terminology of MSR fuel cycles.

Refer to the Information Sheet for more details.