Countries with nuclear facilities are considering ways to safely store radioactiveleftovers from their nuclear activities over long timescales, including spentnuclear fuel. In Sweden, this work has come relatively far with the constructionphase now beginning for a deep geological repository for spent nuclear fuel at Forsmark. In parallel to the development of storage technologies, work is being carried out internationally to develop ways of communicating the long-term hazards of the radioactive remains to future generations. One such approach for communicating information about repositories and their content is called the Key Information File (KIF), a concept advanced through international expert groupsled by the Nuclear Energy Agency (NEA) within the Organisation for Economic Co-operation and Development (OECD).

This is the concluding report about the work to write a Key Information File for the prospective Forsmark Spent Fuel Repository, in a project commissioned by the Swedish Nuclear Fuel and Waste Management Company (SKB) over theperiod 2021-2024. It outlines project activities, insights gained, and recommendations for further work. In the report, it is argued: (1) for the KIF tosuccessfully work as tool for information transfer to future generations means accepting it is a document aimed at the widest possible audience, and therefore must be presented in a manner open to various readers; (2) that there is a need for a mechanism that supports the continuous renewal of the KIF, and here the projectuniquely proposes the SHIRE method, which stands for Share-Imagine-Renew; and (3) that the KIF also has an important role to play in contemporary conversations around memory transfer concerning nuclear waste repositories. This is because the work to rewrite a given KIF will in itself form a social practice, which could keep complex and critical questions about the memory of underground repositories relevant through time.