RadChem 2018

Session

NFC 5

NFC.5

17 May 2018, 13:30

Casino Conference Centre

Conveners

NFC 5

• Guoan Ye
• Konstantinos Kavallieratos (Florida International University)

436. New applications of the hot compressed water method for the chemistry of the nuclear fuel cycle

Dr Karin Popa (European Commission Joint Research Centre (JRC))

17/05/2018, 13:30

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

Invited

The hot compressed water (HCW) is a remarkable reaction medium. In the nuclear field, the HCW method has been successfully applied in chemical synthesis and separations, nuclear waste treatment, studies of accelerated corrosion of cladding materials, etc. Moreover, the supercritical water (SCW) reactor is a concept of GenIV reactors under consideration.
We have employed the HCW (here...

527. Heat treatments of Cl-- and water-contaminated PuO2 and its analogues

Sophie Sutherland-Harper (University of Manchester)

17/05/2018, 14:00

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

Verbal

Magnox PuO2 packaged before 1975 has become contaminated with Cl-, from thermally degraded PVC bags it was stored in, and water, from exposure to the atmosphere. Heat treatment is the preferred method for decontaminating the PuO2 for storage before either subsequent reuse as Mixed Oxide (MOX) fuel or safe disposal in a Geological Disposal Facility (GDF). Ion chromatography experiments carried...

597. Thermal decomposition and structural changes of lanthanide-doped uranium dioxide particles prepared by internal gelation

Mr Christian Schreinemachers (Belgian Nuclear Research Centre (SCK•CEN), Institute for Nuclear Materials Science)

17/05/2018, 14:15

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

Verbal

In any advanced nuclear fuel cycle, partitioning and transmutation (P&T) is a key strategy to reduce spent nuclear fuel’s radiotoxicity and heat generation: Long-lived minor actinides (MA) are partitioned from spent nuclear fuel and subsequently converted to fuel pins or targets. These are used as nuclear fuel in fast reactor systems where the actinides are fissioned to short-lived...

719. MCNP modeling of impurity activation in graphite moderator and reflector of a L-54M-type nuclear research reactor

Dr Eros Mossini (Politecnico di Milano)

17/05/2018, 14:30

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

Verbal

The CeSNEF L-54M was a homogeneous nuclear research reactor fueled by a uranyl sulfate aqueous solution enriched by 19.94% 235U. It was commissioned by Politecnico di Milano to Atomics International in the late '50s. After 20 years of operation, in 1979 the reactor was definitely shut down. Since then, Politecnico di Milano decided to manage the entire structure according to in-situ safe...

522. Homogeneous precipitation of thorium by thermal decomposition products of urea

Mr Tadeas Wangle (Belgian Nuclear Research Centre (SCK·CEN), Institute for Nuclear Materials Science)

17/05/2018, 14:45

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

Verbal

Although thorium dioxide is considered as a replacement for UO$_2$ as a matrix for nuclear fuel, there are practical problems which must be resolved before deployment. These include the poor sinterability and the cost of manufacture. ThO$_2$ is the most stable binary oxide and thus requires higher temperatures than UO$_2$ to sinter to the required densities of ≥95%. The sintering temperatures...