[en] In the scenarios for deep, geological nuclear-waste repositories, clayey soils will be hydrated, heated, cooled and dried. The numerical modelling of these mechanical processes is a key issue. Performance assessment of deep repositories for heat-generating radioactive waste would benefit from improvements in mechanical stress-strain constitutive modelling of the coupled thermo-hydro-mechanical behaviour. The presented framework allows progress in understanding the most involved phenomena relevant to nuclear-waste repositories and their coupled nature. It could be used both in the design and in the performance assessment of repositories. It may be applied to disposal in clay formations and to hard-rock repositories where artificially compacted clay is to be used as buffer and backfill. Such a constitutive framework may help in understanding some unexplained or controversial behaviours and in defining experimental programmes to answer key questions. (author)

[en] Noble liquid calorimetry is a well proven technology that successfully operated in numerous particle physics detectors (D0, H1, NA48, NA62, ATLAS, …). Its excellent energy resolution, linearity, stability, uniformity and radiation hardness as well as good timing properties make it a very good candidate for future hadron and lepton colliders. Recently, a highly granular noble liquid sampling calorimeter was proposed for a possible FCC-hh experiment. It has been shown that, on top of its intrinsic excellent electromagnetic energy resolution, noble liquid calorimetry can be optimized in terms of granularity to allow for 4D imaging, machine learning and - in combination with the tracker measurements - particle-flow reconstruction. This talk will discuss the ongoing R&D to adapt noble liquid sampling calorimetry for an electromagnetic calorimeter of an FCC-ee experiment with a focus on signal extraction, noise mitigation and cryostat material budget. In addition to that, performance studies realized with the FCCSW full simulation framework will be presented.

[en] An uranium oxide UO₂ powder is prepared and 2 to 12% in weight of gadolinium oxide Gd₂O₃ is added. Then fuel pellets are roughly fabricated, then sintered in a hydrogen atmosphere containing 0,2 to 5% of water vapor. This process has an application in the field of PWR reactors

No abstract available

[en] The rare earth silicate has the following formula: (Ln_1-x-y-zLn'_xCe_yTb_z)_9.33 (SiO₄)₆O₂ where Ln and Ln' are different and represent La, Gd, Yb and Lu, x, y and z are chosen with 0< x<1, 0< y<0.05, 0< z<0.05, 0< y + z<0.1 and 0< x + y + z<1. The monocrystal is used as scintillator associated to a photodetector for X and/or gamma rays detection

[en] The microscopic study of uranium dioxide sintered in hydrogen, together with density measurements, shows on the one hand that the large scale appearance of pores trapped at the grain boundaries in the course of sintering has the effect of practically stopping densification, and on the other hand that this particular microstructure is stable over a wide range of time and temperature. (author)

No abstract available

[en] A process is described for sintering a powder of metallic oxides particularly UO₂, PuO₂. The powder is oxidized to obtain on its surface a layer of hydrated oxide of the metal. If the oxides are UO₂, PuO₂, their mixture or ThO₂, the treated powder can be used for nuclear fuel pellet fabrication by cold compression and subsequent sintering

No abstract available

[en] In the French context, a comparative study is made between PWR line and heavy water line (Candu type). Following criteria have been taken into account: kWh cost, technology, industrial environment required, uranium supply, safety. As a conclusion, the study considers that heavy water line, as it is easy to implement and uranium-saving and because of its good operating results, should be a valuable waiting line before fast breeder reactors implementation