The National Co-operative for the Disposal of Nuclear Waste (Nagra) has had to demonstrate the feasibility for the disposal of both low and intermediate level as well as for high-level waste. The Federal Council has given its approval in both cases and thus confirmed that radioactive waste can be safely disposed of in the long-term in deep geological repositories.
The requirement for a demonstration of feasibility was stipulated in the Federal Resolution concerning the Atomic Energy Act as far back as 6 October 1978. In 1988, the Federal Council accepted that a demonstration of feasibility for the disposal of low and intermediate level waste had been given. Nagra submitted this initial demonstration of feasibility based on a repository constructed in marl rock of Oberbauenstock in the Canton of Uri.
At the end of 2002, Nagra submitted an application for a demonstration of feasibility for a method to dispose of high-level waste based on a project in opalinus clay in Zurich Weinland (today northeast Zurich). The Federal Council gave its approval for the demonstration of feasibility in 2006.