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EXPERIMENTAL STUDIES OF THE EDF REACTOR WASTES LEACHING (RMA4 AND 5)

Objectif

QUALIFICATION STUDIES OF I.E.R. COATING WITH POLYMERIC (PEC/SIE - DOW METHOD) WERE ACHIEVED BY E.D.F. AND CEA.

VERY ACTIVE I.E.R. CONDUCT TO DIFFICULT CHEMICAL PROBLEMS. SO, EXPERIMENTAL STUDIES ABOUT REACTOR WASTES LEACHING WITH SAMPLE OF IER COATING WITH POLYMERIC (AND CATALYSER, PROMOTER) ARE NECESSARY TO STUDY PARAMETERS AND QUALITY OF CONFINEMENT. THIS EXPERIMENTAL WORK IS BEGINNING SINCE 1988. FOUR INVESTIGATION DIRECTIONS IN RESEARCH WILL BE STUDY:
- OPTIMIZATION OF SAMPLING, "AO" MEASURE (INITIAL ACTIVITY),
- REPRODUCTIVENESS OF LEACHING LEVELS, WITH LOAD AND IER TYPE,
- INFLUENCE ABOUT LEACHING LEVEL OF THE LOAD OF THE LIXIVIATION LIQUID (TYPE OF STORAGE),
- INFLUENCE OF COATING ABOUT LIXIVIATION LEVEL.
This project examines the mechanisms of lixiviation in ion exchange resins used in a coated form in thermosetting resins. 3 types of samples were used, small inactive samples containing boron and lithium small active samples additionally loaded with cobalt-60 and caesium-137, and 2 full scale packages for comparison. Results show differences in element lixiviation speed depending on factors such as pH, demineralised water, water with ethylenediaminetetraacetate (EDTA) (for cobalt-60), uncoated IER (if V/S was about 0.033 cm) and V/S report. As far as the 2 radionuclides are concerned, 3 factors are particularly important: the nature of the lixiviating agent (saline load), the pH of the agent and the presence of a complexing agent (for cobalt-60). Small loaded samples give higher values than the full scale packages. The optimal mass to be collected for analysis in order to measure the initial activity and the initial chemical composition of the coated samples was determined to be about 10g.

Lixiviation of reactor wastes has been studied using inactive samples and active samples. Full scale active packages have been manufactured and an indication of first values for lixiviation on these is given after 180 days. The main conclusions on the lixiviation mechanisms involved are given.
ALL TESTS USE ACTIVE AND INACTIVE SAMPLES WITH HIGH AND LOW AMOUNT OF 60CO, 137CS, B, LI LIKE IMPURITIES.
THE STATIC LIXIVIATION TIMING IS 15, 30, 60, 90 DAYS.
1. "AO" MAKING UP OF SAMPLES AND AO STUDIES
- DISC THICKNESS: 3, 5, 10, 20 MM
- CLIP MASS: 1, 10, 20 G
DESTRUCTIVE AND NON DESTRUCTIVE METHOD FOR ANALYTICAL MEASURES.
2.LIXIVIATION STUDIES IN RFS WATER (4 X 2 MEASURES WITH ACTIVE SAMPLES) - LIXIVIATION SPEED RELAXED (CM/D)
3. IDEM WITH INACTIVE SAMPLES
4. ACTIVE SAMPLE TEST PROCEDURE WITH:
- DE-IONIZED WATER
- RFS WATER PH8
- RFS WATER PH4
- RFS WATER WITH E.D.T.A.
(4 X 2 MEASURES)
5. INACTIVE SAMPLE TEST PROCEDURE WITH:
- DE-IONIZED WATER
- RFS WATER PH8
- RFS WATER 5 CELSIUS DEGREES
- RFS WATER + BORE
6. INACTIVE SAMPLE TEST WITH 2 DIFFERENT VOLUMES OF LEACHATES (1,5 AND 3 LITERS)
7. INACTIVE SAMPLE TEST WITH DIFFERENT V/S VALUES
8. INACTIVE SAMPLE TEST WITH DIFFERENT SEQUENCES
- 4 X 7 DAYS
- 30 AND 90 DAYS
9. INACTIVE SAMPLE TEST WITH AGITATION OF WATER
- 30 AND 90 DAYS
10. COATING STUDIES WITH ACTIVE SAMPLES
- RFS WATER AND IER WITHOUT COATING
- RFS WATER + 3H AND IER WITH COATING
- RFS WATER + 137CS AND IER WITH COATING
- ACTIVE SAMPLE AND THEN INACTIVE SAMPLE IN THE SAME RFS WATER
11. COATING STUDIES WITH INACTIVE SAMPLES
- RFS WATER AND IER WITHOUT COATING
- RFS WATER AND CORE SAMPLE
- RFS WATER AND IMPREGNATED SAMPLE (WITHOUT MIXING)
- SAMPLE WITH B + LI AND THEN SAMPLE WITHOUT B + LI IN THE SAME RFS WATER
12. EFFECT OF IRRADIATION
- 2 SAMPLE LOADED WITH B + LI
13. FULL-SCALE EFFECT
- RFS LEACHING OF AN INDUSTRIAL FULL SCALE PACKAGE FOR ONE YEAR.

Thème(s)

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Appel à propositions

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Régime de financement

CSC - Cost-sharing contracts

Coordinateur

Commissariat à l'Energie Atomique (CEA)
Contribution de l’UE
Aucune donnée
Adresse
Centre d'Études de Cadarache Sere-Ders
13113 SAINT-PAUL-LEZ-DURANCE
France

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