Used Fuel Disposition Campaign
FE Heater Test at Mont Terri
Jonny Rutqvist,, Hao Xu, Jens Birkholzer Lawrence Berkeley National Laboratory UFD WG Meeting in Las Vegas International Disposal R&D June 8, 2016
Used Fuel Disposition
FE Heater Test at Mont Terri Objectives, Tasks and Status
Modeling Mont Terri FE Experiment (Currently 6 international modeling teams; different group from DECOVALEX)
UFD objectives for participating include to develop expertise and test advanced models on coupled THM processes in clay-based backfill in interaction with clay host rock at full scale
Benchmark modeling of experiment with comparison to the results of international modeling teams (Completed, April 2014)
Model prediction and design of experiment (Preliminary prediction and modeling for heat power design, completed 2015)
Mont Terri Full-scale Emplacement (FE) Experiment is undertaken by NAGRA and other partners as an ultimate test for the performance of geologic disposal in Opalinus Clay, with focus on both the EBS components and the host-rock behavior; it will be one of the largest and longest running heater tests worldwide.
(Figure from Tobias Vogt NAGRA)
2.5 m
concrete plug (5m)
2016_01_27_data_analysis Gab 3
Heating H1 since 15th of Dec.
Heating H3 + H2 since 17th + 18th of Feb.
Used Fuel Disposition
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Emplacement started Sept 4, 2014
Bulkhead
Heater on Pedestal
Bentonite blocks (All photos by Herwig Muller in NAGRA Daily Reports of Emplacement 9/4/2014-2/15/2015)
All heaters turned on from Feb 15, 2015
Instrumented Tunnel around H3
Extensometer
Seismic sensors
Granular bentonite emplacement
Emplacement of Heaters and Bentonite Buffer
Used Fuel Disposition
Measured Data Until February 2016
Gab 5 2016_01_27_data_analysis
Temperature at heater surface
Relative Humidity in buffer 10 cm from heater
Used Fuel Disposition
Access tunnel Plug Heaters
Heater
Bentonite blocks Bentonite
pellets
Shot crete
3D mesh with 21,140 elements
100
m
TOUGH-FLAC Model of the Mont Terri FE Experiment
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Used Fuel Disposition
TIME (days)
TEM
PER
ATU
RE
(Co )
0 20 40 60 80 100
50
100
150
r = 1.18 mr = 5 m
TIME (days)
TEM
PER
ATU
RE
(Co )
0 200 400 600 800 1000
50
100
150
r = 1.18 m r = 5 m
TIME (days)
LIQ
UID
SATU
RAI
ON
(-)
0 20 40 60 80 1000
0.2
0.4
0.6
0.8
1
r = 1.18 mr = 5 m
TIME (days)
LIQ
UID
SATU
RATI
ON
(-)
0 200 400 600 800 10000
0.2
0.4
0.6
0.8
1
r = 1.18 mr = 5 m
First 100 days Evolution over 1000 days (3 years)
Model Predictions of the Mont Terri FE Experiment
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Used Fuel Disposition
Status and Next Steps
The FE experiment is running well and data for 1st year have been delivered to modeling teams
Interpretative modeling of field data over 1 year
Next Mont Terri FE heater test modeling meeting in November 2016
Opportunity for applying dual-structure (BExM) model in collaboration with the Barcelona group
The extensive monitoring of mechanics (stress and strain) within the buffer will be very important for validation of mechanical constitutive models
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