Currently running projects at the GTS
Upcoming Events related to the GTS
24-25 April 2017 : LTD Meeting, Switzerland
10-11 May 2017 : FEBEX-DP Final meeting, Spain
11-12 May 2017 : CFM Meeting, Japan
13th-14th June 2017 : ISCO Meeting, Switzerland
December 2017: LASMO Meeting
NUMO (Nuclear Waste Management Organization), Japan has become a new partner in following projects: CFM, LCS, LTD and MaCoTe.
Grimsel's Role in Underground Research & Development
The Grimsel Test Site is a research facility and not a potential repository site; although investigations may utilise a wide range of radioactive tracers, no radioactive waste will be disposed of at the GTS.
Full-Scale Emplacement (FE) Experiment, Nagra participation in the EU project
Large Underground Concept Experiments (LUCOEX)
to the presentation of the FE backfilling machine
on Monday 19th of May 2014 starting at 3pm and
to dinner in the evening, followed
by a one-day workshop on
bentonite material production & emplacement
on Tuesday 20th of May 2014
from 9am until approx. 4pm.
The presentation and workshop will be
held in the facilities of Belloli SA
in Grono GR, Switzerland
We would be pleased to welcome you in Grono!
Herwig R. Müller (Nagra), PM of the FE experiment
Hanspeter Weber (Nagra), LUCOEX work-package leader
The FE Experiment is a 1:1-scale heater experiment investigating the THM-coupled effects on the engineered barrier system and on the host rock (Opalinus Clay), which will be installed and run in the Mont Terri underground research laboratory.
Mont Terri Webpage : http://www.mont-terri.ch
Bentonite Block Pedestal Load Tests carried out at the Grimsel Test Site
A multi-barrier approach ensures the long-term isolation of radioactive waste and is the adopted solution of preference for radioactive waste management. The Engineered Barrier System (EBS) is one part of this passive multi-barrier system approach and it refers to all barriers introduced through technological (engineered) activities. It is complemented by the natural barrier, also referred to as the geological barrier or geosphere.
Most of the experiments running at Grimsel are focusing on using in-situ tests to analyse and characterise the near field of a nuclear waste repository. The near field includes the Engineered Barrier System (EBS) and the immediate rock surrounding a repository. In Nagra's concept, the disposal tunnels and caverns are placed deep underground (from around 600m) and in stable rock formations. Slightly different disposal methods are envisaged for the high level waste (HLW - spent fuel rods from reactors or vitrified waste) and the intermediate to low level waste (I/LLW - industrial waste). These two concepts are explained below.
Nagra's concept for an underground nuclear waste repository
1. High level waste (HLW) tunnels
The high level waste is contained within large steel disposal canisters.
These canister are placed on bentonite pedestals within the disposal tunnel at regular intervals, and the tunnel backfilled with bentonite.
Nagra's high level waste (HLW) disposal concept - cutaway
Nagra's high level waste (HLW) disposal concept - partly backfilled
Grimsel experiments which are relevant to the high level waste (HLW) concept are :
- CFM - Colloid Formation and Migration experiment
- C-FRS - CRIEPI's Fractured Rock Studies
- ESDRED / TEM - Test and Evaluation of Monitoring Systems
- LCS - Long Term Cement studies
- LTD - Long Term Diffusion experiment
2. Low level waste (LLW) caverns
Low level waste is contained within steel drums, and these steel drums are placed into concrete disposal casks, and filled with mortar.
The disposal casks are stacked into the low level waste disposal caverns which are lined with concrete. When full, the caverns are backfilled with mortar.
Nagra's low level waste disposal cavern concept - cutaway
The low level waste (LLW) disposal cavern is shown below during the operational phase, and when it has been backfilled with mortar and sealed.
Nagra's low level waste (LLW) disposal concept - operational
Nagra's low level waste (LLW) disposal concept - backfilled
Grimsel experiments which are relevant to the low level waste (LLW) concept are :