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APPLICATION OF EC-TEST PROCEDURE: REPOSITORY SYSTEM SIMULATION TEST.

Objective

THE EC TEST PROCEDURE PROVIDES:

- A TEST METHOD WHICH MAY BE USED BY VARIOUS LABORATORIES INTESTED IN EVALUATING WASTE FORM PERFORMANCE IN DIFFERENT HOST ROCK MATERIALS, INCLUDING GRANITE, CLAY AND SALT;
- A VERSATILE TEST APPARATUS WHICH MAY BE USED IN A FLOW TEST OR AS CLOSED SYSTEM UNDER EXTREMELY DIFFERENT EXPERIMENTAL CONSITIONS INCLUDING PRESSURES UP TO SEVERAL HUNDRED BARS, TEMPERATURES UP TO 200 CELSIUS DEGREES, CORROSIVE SOLUTIONS, ETC... AND WHERE THE WASTE FORM CAN BE TESTED IN THE PRESENCE OF ONE OR SEVERAL ADDITIONAL MATERIALS, E.G. CANISTER, BACKFILL, OVERPACK AND HOST ROCK MATERIALS;
- EXPERIMENTAL EVIDENCE FOR THE APPROPIATE FUNCTIONING AND OPERATION EXPERIENCE WITH THE TEST APPARATUS PRIOR TO ITS INCLUSION IN THIS DOCUMENT;
- SPECIFIED EXPERIMENTAL CONDITIONS IN THE DOCUMENT WHICH MAY BE USED AS A REFERENCE IN A ROUND ROBIN TYPE INTERLABORATORY TEST.
THE RESULTS OF THE ROUND ROBIN TEST SHALL BE PUBLISHED AS AN EC REPORT TO PROVIDE A REFERENCE DATA BASE.

THE REPOSITORY SYSTEM SIMULATION TEST (RSST) HAS BEEN LAID OUT TO ACCOMODATE A WIDE RANGE OF EXPERIMENTAL CONDITIONS AND MATERIALS IN A MULTI PURPOSE LEACHING CONTAINER. AMONG THE POSSIBLE OPTIONS ARE: ACTIVE TESTS, TEMPERATURES UP TO 200 CELSIUS DEGREES, CHOICE OF STATIC OR DYNAMIC TESTS.
IN ORDER TO VERIFY, THAT THE TEST PROCEDURE IS WORKABLE AND THAT REPRESENTATIVE AND REPRODUCIBLE RESULTS CAN BE OBTAINED, THE COMMISSION WILL ORGANIZE AN INTER-LABORATORY TEST CAMPAIGN (ROUND ROBIN) FOR ASINGLE SET OF CONDITIONS, BUT WITH A CHOICE OF 3 GEOLOGIC HOST MATERIALS; SALT, CLAY AND GRANITE. THE TEST CONDITIONS AND MATERIALS SPECIFIED FOR THE ROUND ROBIN TEST THEREFORE ONLY PRESENT A SMALL PART OF THE SCOPE OF THE REPOSITORY SYSTEM SIMULATION TEST.
THE RSST WILL DETERMINE CONCENTRATIONS OF MATRIX CONSTITUENTS AND RADIONUCLIDES RELEASED FROM NUCLEAR WASTE FORMS UNDER SIMULATED GEOLOGICAL REPOSITORY CONDITIONS.
BY CARRYING OUT SOLUTION ANALYSIS AT TIMES BETWEEN 7 DAYS AND ONE YEAR (OR LONGER), MATRIX CORROSION AND NUCLIDE LEACHING RATES CAN BE MEASURED AND, FINALLY, EQUILIBRIUM CONCENTRATIONS IN THE SYSTEM CAN BE DETERMINED. THE RESULTS SHOULD PROVIDE THE INFORMATION TO ESTABLISH AND VALIDATE NEAR-FIELD MODELS FOR RISKS ANALYSIS.

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Coordinator

UNIVERSITEIT VAN AMSTERDAM
EU contribution
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Address
SPUI 21 POSTBUS 19268
1000 GG
Netherlands

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