The Grimsel Test Site was designed as a generic underground rock laboratory and, since the start of its operation in 1984, it has served as a source of knowledge for assessing and developing methods for the characterisation and description of fractured rocks, engineered barrier systems and their interaction with the surrounding rocks and, more generally, for contributing to the assessment of features, events and processes that influence repository performance..

The Grimsel Test Site (GTS) is located at an altitude of 1730 metres within the granitic rock of the Aar Massif in central Switzerland.

The GTS provides an environment which is analogous to that of a repository site so allowing the development and testing of equipment, methodology and models under fully realistic conditions. International partners from Europe, Asia and North America are working together at this unique facility.

The Grimsel test site (GTS) view of interior tunnels

Its all very well to design a waste disposal system - but how do you know that it will work ?

This is where the Grimsel Test Site (GTS) comes in - with experiments to test the long term behaviour of the engineered barriers, to develop and test tools to confirm the suitability of potential geological host rocks and to test the models used to predict its performance as a long-term barrier to radionuclide release.

Many countries have plans for repositories but in order to ensure that their designs will work, they need somewhere to test out their concepts for safe waste disposal.

These tests should be carried out in similar conditions to a repository. The GTS is a research facility several hundred metres underground which provides a relevant environment for equipment, methodology and model tests.

View over the Hotel Grimsel Hospiz.

GMT Silo

Febex bentonite backfill