RadChem 2018

Session

NFC 3

NFC.3

15 May 2018, 13:30

Casino Conference Centre

Conveners

NFC 3

• Andreas Geist (Karlsruhe Institute of Technology (KIT))
• Karin Popa

748. Hot test of advanced Purex process and its results

guoan ye

15/05/2018, 13:30

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

Invited

The hot test of advanced Purex processing (Fig.1) based on organic reducing agent was carried out by using experimental reactor UO2 spent fuel with low burn-up in CRARL(China reprocessing and radiochemistry laboratory).

![Fig. 1: The flow-sheet of advanced Purex process.][1]
Fig. 1: The flow-sheet of advanced Purex process.

Several used fuel rods were chopped, dissolved and then separation...

686. Soft Donor Ligands for Actinide/Lanthanide Separations in Used Nuclear Fuel and for Hg(II) Coordination and Extraction in Alkaline Tank Waste Processing

Prof. Konstantinos Kavallieratos (Florida International University)

15/05/2018, 14:00

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

Verbal

Minor actinides in used nuclear fuel are responsible for much of its radiotoxicity and heat generation. Actinide(An)/Lanthanide(Ln) separation processes via selective complexation and solvent extraction by designed soft S- and N-donor ligands can take advantage of the slight differences in relative hardness of An(III) vs. Ln(III), leading to potentially selective separations. Furthermore, the...

762. Partitioning of minor An(III) and Ln(III) by the 1,2,4-triazine extracting compounds

Jan John (CTU in Prague)

15/05/2018, 14:15

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

Verbal

Partitioning of trivalent minor actinoids from lanthanoids and mutual separation of minor actinoids is a current issue studied within reprocessing of irradiated nuclear fuel and nuclear reactors of the IV$^{th}$ generation, i.e. closing of a nuclear power cycle. The objective of this contribution is to summarize results obtained for various liquid-liquid or solid-liquid extraction systems,...

430. Gas-phase nitration of metallic uranium, zirconium, and aluminum

Dr Vladimir Kulemin (Frumkin Institute of Physical Chemistry and Electrochemistry RAS)

15/05/2018, 14:30

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

Verbal

Oxidative embrittlement (voloxidation, volume oxidation) of both the fuel itself and of Zircaloy fuel claddings shows promise as modification of head-end operations of the PUREX process. The gas-phase conversion of oxide fuel in various atmospheres (O2, air, О3, Н2О vapor, air–СО2 mixture) at 300–600°С ensures almost complete removal of volatile components (3H, 14C, 129I, radioactive noble...

443. Thermodynamic analysis of fluorine regeneration from uranium hexafluoride with a flame of hydrogen-containing fuel and oxygen-containing oxidant using

Prof. Dmitrii Pashkevich (Peter the Greate Saint-Petersburg Polytechnic University; New Chemical Products Ltd.)

15/05/2018, 14:45

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

Verbal

The uranium hexafluoride depleted in the U-235 isotope (DUHF) is a by-product of isotope uranium enrichment in the nuclear fuel cycle (NFC). The accumulated DUHF amount in the world reaches 2 million tons, including in Russia up to 1 million tons.
Uranium hexafluoride is a very toxic substance (maximum allowable concentration in the air is 0.015 mg•m-3), volatile (p = 0.1 MPa at 56 °C) and...