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Discourses around nuclear waste were, for decades, dominated by techn(ocrat)ic debates. The respective international group of experts can be understood as an epistemic community (Haas 1992), as this community impacts on the way an issue is perceived and discussed. Yet, nuclear waste is not only a technical, but also a so-called socio-technical problem, and hence the discourses have been broadened. Lately, risk communication has become ubiquitous in discussions on the siting of nuclear waste across the globe. Lay knowledge, risk perception, involvement and procedural justice are some of the terms used and negotiated here. Thus, the question can be posed as to whether this trend will lead to the development of a new epistemic community that also includes experts on social scientific aspects. Using a set of different sources, we demonstrate potential difficulties in the mutual understanding of …