Conveners
NFC 3
- Andreas Geist (Karlsruhe Institute of Technology (KIT))
- Karin Popa
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...
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...
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,...
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...
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...
