The Joint Evaluated Fission and Fusion File (JEFF)  Nuclear Data Library Project  is a collaboration between NEA Data Bank participating countries. The JEFF library combines the efforts of its different working groups to produce a common set of evaluated nuclear data, mainly for fission and fusion applications. The JEFF project meets twice a year, in autumn and spring. The next edition of the Nuclear Data Week will take place on 25-29 November 2024, and will host both the JEFF Co-ordination Group and the JEFF technical sessions.

• Fusion Session: 25 November 2024
• Other Sessions: Experiments, Thermal Scattering Law, Fission Observables, Decay Data, Theory and Models, Evaluation Methods, Nuclear Data Uncertainties, Processing, Benchmarking, Depletion, Feedback from Industry, JEFF-4 Status (dates to be finalised based on contributions)
• JEFF CG: 29 April 2024 (morning)

• 16 September: Registration opens
• 18 October: Draft timetable released
• 1 November: Registration closes for speakers
• 4 November: Finalisation of agenda
• 15 November: Registration closes for audience members