Contact

Dr. Katharina Müller

Head Surface Processes
k.muellerhzdr.de
Phone: +49 351 260 2439

Homepage

Behavior of long-lived fission and activation products in the near-field of a repository for nuclear waste and possibilities of their retention (VESPA II)

Financed by:

Federal Ministry for Economic Affairs and Energy (02 E 11607B)

Funding period:

2017/09 – 2021/06

Cooperation Partner:

Karlsruhe Institute for Technology, Institute for Nuclear Waste Disposal (KIT-INE, Karlsruhe, Germany)
Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) GmbH (Braunschweig, Germany)
Institut für Energie- und Klimaforschung Nukleare Entsorgung und Reaktorsicherheit (IEK-6, Jülich, Germany)

People:

N. Mayordomo, D. Rodríguez (PhD student), K. Müller (project leader)

Web page:

https://vespa2.grs.de

Summary

Long-term safety assessments for final disposals of high-level radioactive waste have to consider the release of radionuclides from the waste and their potential retention by the multi-barrier system. To date, it has been assumed in long-term safety analysis that there is only retention for cationic but not for anionic species within the near-field of final disposals.

In this context, the joint research project VESPA II, has the primary objective to investigate the retention of ⁷⁹Se, ¹²⁹I and ⁹⁹Tc. In aquatic solutions, these elements mainly occur in anionic form and do not form poorly soluble phases. The goals of VESPA II are:

filling the gaps on the reported thermodynamic data related to fission products and
analyzing their retention by minerals phases likely found in the near-field repository, such as corrosion products.

HZDR is involved in the following work packages

studying the surface speciation and incorporation of Tc(VII) and Tc(IV) on iron corrosion phases, environmental ubiquitous minerals and on LDH phases under reducing conditions and
investigating the Tc chemistry and thermodynamics, especially for low oxidation states.

Bachelor/Master thesis topic

Publications

Tc(VII) reductive immobilization by Sn(II) pre-sorbed on alumina nanoparticles

Mayordomo, N.; Roßberg, A.; Prieur, D.; Scheinost, A.; Kvashnina, K.; Müller, K.

Involved research facilities

Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265

Related publications

DOI: 10.1107/S1600577520014265 is cited by this (Id 35404) publication

Lecture (Conference)
ATAS-AnXAS 2022 - Joint Workshop, 17.-21.10.2022, Grenoble, France

Tc(VII) reductive immobilization by Sn(II) pre-sorbed on alumina nanoparticles.

Mayordomo, N.; Rodríguez, D. M.; Roßberg, A.; Scheinost, A.; Müller, K.

Involved research facilities

Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265

Related publications

DOI: 10.1107/S1600577520014265 is cited by this (Id 34638) publication

Lecture (Conference)
19th Radiochemical conference, 15.-20.05.2022, Marienbad, Czech Republic

The importance of understanding Technetium environmental behaviour

Mayordomo, N.

Lecture (others) (Online presentation)
Seminar at Freie Universität Berlin, 07.02.2022, Berlin, Germany

Technetium retention by green rust chloride

Mayordomo, N.; Rodriguez Hernandez, D. M.; Schild, D.; Roßberg, A.; Scheinost, A.; Brendler, V.; Müller, K.

Involved research facilities

Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265

Related publications

DOI: 10.1107/S1600577520014265 is cited by this (Id 32650) publication

Lecture (Conference) (Online presentation)
Goldschmidt 2021, 04.-09.07.2021, Online, Online

Reductive immobilization of 99Tc(VII) by FeS2: the effect of marcasite

Rodriguez Hernandez, D. M.; Mayordomo, N.; Schild, D.; Shams Aldin Azzam, S.; Brendler, V.; Müller, K.; Stumpf, T.

Chemosphere 281(2021), 130904
DOI: 10.1016/j.chemosphere.2021.130904
Cited 8 times in Scopus

Analysis of technetium immobilization and its molecular retention mechanisms by Fe(II)-Al(III)-Cl layered double hydroxide.

Mayordomo, N.; Rodriguez Hernandez, D. M.; Roßberg, A.; Foerstendorf, H.; Heim, K.; Brendler, V.; Müller, K.

Involved research facilities

Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265

Related publications

DOI: 10.1107/S1600577520014265 is cited by this (Id 31419) publication

Chemical Engineering Journal 408(2021), 127265
Online First (2020) DOI: 10.1016/j.cej.2020.127265
Cited 30 times in Scopus

Fusion-Based Neutron Generator Production of Tc-99m and Tc-101: A Prospective Avenue to Technetium Theranostics

Mausolf, E. J.; Johnstone, E. V.; Mayordomo, N.; Williams, D. L.; Guan, E. Y. Z.; Gary, C. K.

Pharmaceuticals 14(2021), 875
DOI: 10.3390/ph14090875
Cited 8 times in Scopus

Radiochemistry and the radioactive nuclear waste management

Mayordomo, N.

Invited lecture (Conferences)
Lectures about chemistry (Lecciones de química), 06.02.2020, Alcalá de Henares, Spain

Technetium retention by gamma alumina nanoparticles and the effect of sorbed Fe²⁺

Mayordomo, N.; Rodriguez Hernandez, D. M.; Schild, D.; Molodtsov, K.; Johnstone, E. V.; Hübner, R.; Shams Aldin Azzam, S.; Brendler, V.; Müller, K.

Journal of Hazardous Materials 833(2020), 122066
DOI: 10.1016/j.jhazmat.2020.122066
Cited 13 times in Scopus

New insights into 99Tc(VII) removal by pyrite: A spectroscopic approach

Rodriguez Hernandez, D. M.; Mayordomo, N.; Scheinost, A.; Schild, D.; Brendler, V.; Müller, K.; Stumpf, T.

Environmental Science & Technology 54(2020)5, 2678-2687
DOI: 10.1021/acs.est.9b05341
Cited 23 times in Scopus

⁹⁹Tc immobilization by aluminum solids containing Fe(II) moieties

Mayordomo, N.; Rodriguez Hernandez, D. M.; Molodtsov, K.; Johnstone, E. V.; Roßberg, A.; Heim, K.; Foerstendorf, H.; Schild, D.; Brendler, V.; Müller, K.

Lecture (Conference)
The 43th symposium on scientific basis for nuclear waste management, 21.-24.10.2019, Viena, Austria

Tc immobilization by Fe(II)-Al(III)-Cl layered double hydroxide phase

Mayordomo, N.; Rodriguez Hernandez, D. M.; Roßberg, A.; Scheinost, A.; Foerstendorf, H.; Heim, K.; Brendler, V.; Müller, K.

Lecture (Conference)
Gesellschaft Deutscher Chemiker Nuclearchemie 2019, 25.-27.09.2019, Dresden, Germany

⁹⁹Tc retention on Fe(II)Al(III)-Cl layered double hydroxides

Mayordomo, N.; Rodriguez Hernandez, D. M.; Scheinost, A.; Roßberg, A.; Brendler, V.; Müller, K.

Involved research facilities

Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265

Related publications

DOI: 10.1107/S1600577520014265 is cited by this (Id 29238) publication

Lecture (Conference)
Goldschmidt 2019, 18.-23.08.2019, Barcelona, Spain

Spectroelectrochemical studies of the Tc(VII) reduction in aqueous electrolyte media

Rodriguez, D.; Mayordomo, N.; Brendler, V.; Müller, K.; Stumpf, T.

Poster
17th international conference on the chemistry and migration behavior of actinides and fission products in the geosphere, 15.-21.09.2019, Kyoto, Japan

Reductive immobilization of 99Tc(VII) by different crystalline phases of iron sulfide (FeS2)

Rodriguez, D.; Mayordomo, N.; Brendler, V.; Müller, K.; Schild, D.; Stumpf, T.

Poster
Migration 2019 - 17th International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, 15.-21.09.2019, Kyoto, Japan
Lecture (Conference) (Online presentation)
Tage der Standortauswahl, 11.-12.02.2021, Freiberg, Deutschland

99Tc retention on pyrite and alumina: the effect of Fe2+

Rodríguez, D.; Mayordomo, N.; Stumpf, T.; Mueller, K.

Lecture (Conference)
The 10th International Symposium on Technetium and Rhenium – Science and Utilization, 03.-06.10.2018, Moscow, Russia

Environmental fate of fission products: a comprenhensive study

Mayordomo, N.; Rodríguez, D. M.; Müller, K.

Invited lecture (Conferences)
Goldschmidt 2018, 12.-17.08.2018, Boston, USA

Retention of Tc(VII) by pyrite nanoparticles

Rodríguez Hernández, D. M.; Mayordomo, N.; Müller, K.

Poster
18th Radiochemical Conference - RadChem 2018, 13.-18.05.2018, Mariánské Lázně, Czech Republic

Tc immobilization on gamma alumina: a study of the reductant presence and absence

Mayordomo, N.; Müller, K.

Lecture (Conference)
18th Radiochemical conference, 13.-18.05.2018, Mariánské Lázně, Czech Republic