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Socio-technical systems produce risks whose spatial and temporal amplitude requires complex regulations that mobilize over time a plurality of actors with heterogeneous stakes and logics. Nuclear power is primarily concerned and we have attempted to explore these issues within the framework of the AGORAS project (2014-2019) launched after the Fukushima accident and whose objective was, in particular, to understand how natural risks have been assessed and taken into account in the French nuclear regulatory system. This work led us to look at several cases of extreme natural events that have occurred in France since the 1980s and especially since the early 2000s and that have threatened the very safety of various nuclear facilities. Over the years, the French nuclear industry has thus been led to carry out a certain number of social and technical apprenticeships and transformations, which have enabled it to improve the way in which so-called "natural" risks are regulated. By risk regulation we mean here the way in which certain potential threats and their effects are anticipated, prevented and, more generally, assessed. The purpose of this paper is therefore to analyze these learnings and in particular to understand how the stakeholders of the nuclear industry have managed to carry out this work despite its complexity, despite their differences, despite the particularly long temporality of this process and despite various discontinuities that can punctuated it. [ABSTRACT FROM AUTHOR]