Abstract: INCEFA-PLUS is a five year project supported by the European Commission HORIZON2020 programme. The project commenced in mid-2015. Sixteen organisations from across Europe have combined forces to deliver new experimental data which will support the development of improved guidelines for assessment of environmental fatigue damage to ensure safe operation of nuclear power plants. Within INCEFA-PLUS, the effects of mean strain and stress, hold time, strain amplitude and surface finish on fatigue endurance of austenitic stainless steels in light water reactor environments are being studied experimentally, these being issues of common interest to all participants. The data obtained is being collected and standardised in an online environmental fatigue database, implemented with the assistance of an INCEFA-PLUS led CEN workshop on this aspect. Towards the end of the project it is planned that INCEFA-PLUS will develop and disseminate methods for including the new data into assessment approaches for environmental fatigue degradation. This paper provides an overall update on project developments since it was last presented at PVP2018 [1]. As well as being a standalone paper, this document will also serve as an introduction to a companion paper being submitted to cover data generated by the project in more detail [2]. In particular, this paper summarises: ? The results for Phases 1 & 2 testing. ? The plans for Phase 3 testing. ? A summary of emerging sensitivities to, and interdependencies between: o Mean strain and stress, surface finish, strain amplitude and hold time. o Environment. o Material. o Laboratory. ? The latest thinking on the direction of the project in its final year. ? The latest thoughts on how the project results will be used to advance development of improved assessment guidelines. ? A summary of dissemination achieved and planned. ? Ideas for work after the end of INCEFA-PLUS.

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