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Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 1 EURISOL WP 5: Safety and Radioprotection Progress.

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Presentation on theme: "Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 1 EURISOL WP 5: Safety and Radioprotection Progress."— Presentation transcript:

1 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 1 EURISOL WP 5: Safety and Radioprotection Progress since May, 2008 K.Bongardt, S.Chiriki, J.Fachinger, M.Herbst, B.Heuel-Fabianek, H.-K.Hinssen, W.Jahn, R.Moormann, R.Nabbi, N.Prolingheuer, R.Odoj, B.Schlögl EURISOL-WP5 meeting Lisboa 17.-18.11.2008

2 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 2 Overview Radioactive Inventories and Radiotoxicities: - Presentation on Physor2008 in Interlaken - Studies on Sr-90 inventories Disposal items - Disposal of mercury target – New results of Suresh Chiriki (thesis) - Publication accepted for Nuclear Technology - Atlas on all Eurisol-waste in progress (contract with FI) Migration of Activitiy with Groundwater - Publication in Nuclear Technology - Report containing activation, a literature collection on partition coefficients and activity migration is under way (EURISOL/SAFERIB report) - Presentation of Nils Prolingheuer on the EURONS week - Activation results have been corrected

3 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 3 Disposal items (WP 5 D) - Suresh Chiriki is since October at PSI, he intends to finish his thesis at the end if this year - His thesis will be the final EURISOL report on mercury disposal items - The experimental work on mercury disposal is finished, but theoretical and documentation work has to be completed - On basis of his presentation on ICRS-11. selected to one of the best presentations, Suresh Chiriki was invited to have a presentation on the ANS Winter meeting. Because of his new job he could however not participate there - A publication in Nuclear Technology was accepted

4 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 4 ……..Disposal items (WP 5 D) Progress in experimental work - Examinations on alternative matrix to concrete for embedding of HgS as waste package for final disposal - Why consideration of alternative matrix materials? - Concrete is always porous, which reduces its protecting ability - Requirement on a matrix for HgS - High chemical stability in a repository - Hardening of the matrix already at low temperature in order to avoid thermal decomposition of HgS  Glass matrix (vitrification ) is not suitable - Potentially suitable matrix: Polysiloxanes (2-component polymer, hardens at low temperature by chemical reaction after mixing of the components. Si content improves stability.

5 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 5 ……..Disposal items (WP 5 D) Polysiloxane materials are the newest generic coating type materials. Recent advances resulted in siloxane binders and coating systems which offer significant improvements in radiation, heat, chemical and oxidation resistance and long term protection from corrosion and degradation. Silicone elastomers (polysiloxanes), materials on the basis of silicon and oxygen with organic substituent, have various physical and chemical properties and seem to be suitable for the long-term storage of low- and intermediate-level radioactive waste. Improvement of stability by additional coating with an additional polysiloxane layer is easily achievable (double layer) About polysiloxanes In our present studies Polysiloxane compound type (RT 622 Elastomer with catalyst from Wacker Chemie GmbH, Germany) is used because it has better alcohol condensation properties compared to other types of polysiloxanes

6 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 6 ……..Disposal items (WP 5 D) The influence of gamma-irradiation on the tensile strength of different polysiloxanes after a total dose rate of 1.1 mGy Odoj R.,Maischak S.,Pfeiffer R.,Valencia L.,Schneider L.,Röhr U. S. R.,Herzog C. Application of Polysiloxanes for the Treatment of Radioactive Waste to Guarantee Safe Longterm Storage, EM'04 Conference, Febr.29-March 4,2004, Tuscon, Arizona

7 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 7 Polysiloxane sample with HgS single coating and double coating

8 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 8 Polysiloxane+HgSe (single coated) Polysiloxane+HgS (single coated) Double coated HgS sample

9 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 9 …….Disposal items (WP 5 D) Strong raiolysis Polysiloxane + Mercury compounds dissolution experiments (temperature of 50-55°C in aerobic conditions about 6 weeks)

10 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 10 …….Disposal items (WP 5 D) HgS embedded in Polysiloxane: Dissolution experiments (cumulative concentration profile for highly reactive Brine-2 at room temperature and T = 50°C)

11 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 11 Distribution of mercury in Polysiloxane + HgS (data of energy-dispersive X-ray spectroscopy analysis called SEM/EDX) Intensity Middle of sample external surface of sample

12 Forschungszentrum Jülich in der Helmholtz-Gemeinschaft Institut für Energieforschung IEF-6 Rainer Moormann 12 Disposal items (WP 5 D) - PX are promising candidates for embedding HgS, if double layer technology is applied - Future additional work required: - Investigations on stability of Polysiloxane/HgS under gamma-irradiation (no irradiation facility any longer available in Juelich because of DIDO reactor shut down) - Mercury solidification under larger than lab-scale conditions

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