RadChem 2018

Session

NFC 2

NFC.2

15 May 2018, 08:30

Casino Conference Centre

Conveners

NFC 2

• Ulrich Noseck (GRS gGmbH)
• Thorsten Stumpf (Helmholtz-Zentrum Dresden - Rossendorf)

872. SF and HLW disposal, long term performance and radionuclide migration in UK radioactive waste disposal – an overview

Nicholas M. Evans (NTU)

15/05/2018, 08:30

Invited

632. Microbial processes in a radioactive waste repository

Miroslav Cernik (Technical University of Liberec)

15/05/2018, 09:00

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

The nuclear fuel cycle ends by spent fuel reposition in an appropriate facility. The long-term performance of a radioactive waste repository can be significantly influenced by geological, geochemical and also biological phenomena. Microbial processes may negatively affect canister (microbial corrosion) and buffer and backfill material (microbial induced chemical and mechanical changes) as well...

462. Characterization of different bentonite and its application in the sorption of Cs and Sr from aqueous solution by bentonite-alginate microcapsules

CHUAN-PIN LEE (Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan)

15/05/2018, 09:15

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

The bentonite materials are frequently designed as buffer/backfill material for engineered barrier in final disposal for spent nuclear fuels (SNFs) or high-level radioactive waste (HLW) repository. The clay minerals showed a favourable environment for sorption of Cs and Sr, bentonite having high sorption toward Cs and Sr were encapsulated in the biopolymer matrices (sodium alginate, NaALG) in...

529. Spectroscopic and batch studies of technetium uptake by siderite

Dr Katja Schmeide (Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology)

15/05/2018, 09:30

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

⁹⁹Tc is a long-lived (t_1/2 = 2.1 x 10⁵ years) β-emitter formed during the fission of U and is of major concern for radioactive waste disposal. Its environmental mobility is primarily governed by the oxidation states VII and IV, with Tc^VII forming the highly mobile TcO₄⁻ aquo anion, whereas Tc^IV is rather immobile due...

588. Effect of background electrolyte composition on the sorption behavior of Th(IV) and Zr(IV) on the muscovite (001) basal plane

Dr Moritz Schmidt (Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource EcologyHZDR)

15/05/2018, 09:45

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

Reliable long-term predictions about the safety of a potential nuclear waste repository must be based on a sound, molecular-level comprehension of the geochemical behavior of the radionuclides. Especially, their reactivity at the water/mineral interface will control their mobility and thus hazard potential.[1] A recent study has found a surprising dependency of the uptake of Th(IV) on the...