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FEASIBILITY STUDY FOR HIGH LEVEL RADIOACTIVE WASTE DISPOSAL IN DEEP BOREHOLES DRILLED FROM THE SURFACE.

Objective

A PRELIMINARY FEASIBILITY STUDY HAS BEEN CARRIED OUT IN THE FRAME OF A PREVIOUS CONTRACT (255-80-7 WASI) ON THE DISPOSAL OF HIGH LEVEL AND CLADDING HULL WASTE IN THE PLIOPLEISTOCENIC BLUE CLAY OF ITALY. TWO PRELIMINARY REPOSITORY MODELS HAVE BEEN ASSESSED: MINED REPOSITORY, DEEP BOREHOLES DRILLED FROM THE SURFACE.
OF THE TWO MODELS, ASSESSED FOR THE SAME REFERENCE POWER PROGRAMME (10 GWE), THE DEEP BOREHOLE FACILITY SEEMS PREFERABLE IF COMPARED TO THE MINED REPOSITORY FROM SEVERALS POINTS OF VIEW BUT ESPECIALLY AS REGARDS TOTAL COST AND FLEXIBILITY. THE DEEP BOREHOLE FACILITY IS ALSO MODULAR, IT DOESN'T HEAVILY INTERFERE WITH LOCAL LAND USE; EVEN IF INACCEPTABLE GEOLOGICAL CONDITIONS ARE ENCOUNTERED IN ONE BOREHOLE, OPERATIONS CAN BE MOVED TO ANOTHER PART OF THE SITE WITH LITTLE COST PENALTY. THE MAIN GOALS OF THIS PROJECT ARE THE FOLLOWING:
- ELABORATION OF A PRELIMINARY DEMONSTRATION TEST OF HIGH LEVEL RADIOACTIVE WASTE DISPOSAL IN DEEP BOREHOLES DRILLED FROM THE SURFACE.
- DETERMINATION OF THE IN LABORATORY AND IN SITU BEHAVIOUR OF PLUGGING AND BACKFILLING MATERIALS FOR DEEP BOREHOLE DISPOSAL.

1. FEASIBILITY DEMONSTRATION TEST OF DEEP BOREHOLE PLUGGING.
1.1. LABORATORY PERMEABILITY TESTS, CARRIED OUT BOTH IN SMALL TRIAXIAL CELLS AND IN BIG OEDOMETRIC CELLS, ON SAMPLES FORMED BY NATURAL CLAY AS WELL AS ON SAMPLES FORMED BY CLAY SEALED WITH DIFFERENT MATERIALS (CEMENT, BENTONITE, ETC).
1.2. ON SITE PLUGGING TEST OF A DEEP BOREHOLE, SEALED WITH THE MATERIAL SELECTED UNDER ITEM 1.1.
2. PROJECT OF A DEMONSTRATION TEST FOR HIGH LEVEL WASTE DISPOSAL IN DEEP BOREHOLES DRILLED FROM THE SURFACE.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA)
Address
Via Anguillarese 301
00060 Santa Maria Di Galeria (Roma)
Italy

Participants (1)

Istituto Sperimentale Modelli e Strutture SpA
Italy
Address
Viale Giulio Cesare 29
24100 Bergamo