In the first part, we highlight the twofold responsibility concerning the current generation’s decision-making perspective for present and future generations. According to our survey data and a debate with citizens, we see the need to discuss the respective weighing of directly affected generations during the next few decades (until the repository’s closure, which affects about four to five generations) compared to justice for (five +) future generations in the following decades and centuries.

Radiation dose estimates over several thousand years, as required for the German site selection procedure, are subject to high uncertainties. Within a transdisciplinary workshop, strategies for communicating such dose estimates and uncertainties are evaluated. Factors will be identified that promote or hinder understandability of modelling results, and the general confidence in the significance of dose estimates as a safety indicator for nuclear waste repositories will be investigated.

In this workshop we would like to raise the question of whether and how this kind of process might be improved. Specifically, in view of the delay in site selection, the haste with which the project was completed should be discussed.

On the proposed poster, we report the results of an experimental study (N = 177) that investigated the preferences for and trust in different visualizations of simulation results and tested different modes of communication (verbal, numerical, and visual/graphical). The oral presentation will focus on another challenge of uncertainty communication, namely unquantifiable model uncertainties. In a repository, these may arise from the heterogeneity of the host rock.

In our project, several disciplines work on issues concerning the management of high-level nuclear waste in Germany. In our sub-project on trust, we have enlisted a group of 16 citizens, reflecting with us on our research questions and approaches. From joint workshops of researchers and these citizens on the role of trust in scientists we find that participants generally want to be taken seriously. Transparent and binding rules for all participants could be the key to a trusting relationship.