2nd International Summer School
on Nuclear Glass Wasteform:
Structure, Properties and Long-Term Behavior Wasteform

September 23 to 27, 2013 in the site of Pont du Gard (France)


Session 1

Vitrification: general aspects

Fission products (FP) account for only 5 wt% of spent nuclear fuel but represent about 98% of its radioactivity. The recovery for possible reuse of 95% of the energy-producing content of spent fuel (uranium and plutonium) is the main rationale for treatment and recycling, particularly in tomorrow’s fast reactors. The fission products and a small fraction of minor actinides, on the other hand, are and will remain the ultimate wasteforms of nuclear energy.

Read more: Session 1

Session 2

Vitreous state: from structure to properties

The chemical composition of glass matrices for conditioning nuclear waste can vary widely depending on the nature of the waste, which has a significant effect on their structural, physical and chemical properties, mechanical properties, chemical durability, etc. A detailed understanding of these phenomena is increasingly possible through spectroscopic and numerical approaches.

Read more: Session 2

Session 3

Glass melt chemistry

Crystallization, phase separation, and foaming are responsible for modifying the properties of the molten glass. They can affect the homogeneity of the melt and allow the production of heterogeneous materials with multiple applications in the field of glass-ceramics (Pyrex, Vycor, opal glass, porous glass, glass for conditioning radioactive waste).

Read more: Session 3

Session 4

Glass melt properties

The physical properties of molten glass are of primary importance in controlling vitrification processes. They are decisive for the operation of the vitrification process itself (glass reactivity, pouring, heating, etc.) and for the final glass characteristics (homogeneity).

Read more: Session 4

Session 5

Glass behavior in open systems

Glass is a thermodynamically metastable phase, and undergoes irreversible transformation into more stable phases, especially in the presence of water. In the perspective of the safety assessment of the future geological disposal, the challenge is to be able to calculate at what rate this transformation and the corresponding release of radionuclides into the groundwater will take place.

Read more: Session 5

Session 6

Glass behavior in closed systems: thermal stability, radiation effect and mechanical properties.

Before groundwater comes into contact with the containment matrix, i.e. during the initial phase of deep geological storage, nuclear glass will be subjected only to the effects of internal irradiation (resulting from minor actinides and fission products) and to the thermal history of the waste package.

Read more: Session 6

Proceeding, important dates

Deadline for submission

icon calendarDecember 20th 2013

Paper review feedback deadline

icon calendarFebruary 15th 2014

Final version

icon calendarMarch 15th 2014

Sumglass Gallery


Logo RegionLR
Logo ICG