Papers by Vincenzo Romanello
SSRN Electronic Journal
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Science and Technology of Nuclear Installations, 2009
Bookmarks Related papers MentionsView impact
ABSTRACT The paper deals with the use of a symbiotic cycle in order to minimize the LWR waste rad... more ABSTRACT The paper deals with the use of a symbiotic cycle in order to minimize the LWR waste radiotoxicity, improving, on the same line, previous work. The obtained results could be considered rather positive. We will show what is possible to do in this field using new original symbiotic cycles, remarkably improving the previous results. To reach this goal, we investigated innovative fuel cycles by using the gas cooled reactors (both thermal and fast). Their very favourable neutronic economy, supported by an appropriated spectrum, allows to transmute/fission actinides, in particular transuranic ones. In this frame, we developed a strategy based on an original symbiotic fuel cycle. We assume to begin using, as normal, enriched uranium in LWRs. The second step deals with burning all the actinides recovered from LWRs spent fuel in HTRs. One of the major innovative results after this irradiation consists in the strong reduction of the neptunium which represents one of the greatest concerns in long term disposal. The last one consists in adding, as fuel in GCFRs, depleted uranium together with all the residual actinides of HTR spent fuel. As final result we obtain a reduction of the Level Of Mine Balancing Time (LOMBT) from 250000 (LWR once through) to about 200 years (proposed symbiotic cycle). This research has to be considered in progress and needs of further confirmation mainly by technological point of view.
Bookmarks Related papers MentionsView impact
We suggest that a change in the lifetime of the α decay of Th ( = 1.9127(5) yr) may be detected a... more We suggest that a change in the lifetime of the α decay of Th ( = 1.9127(5) yr) may be detected at static pressures as high as 1 Mbar, a regime nowadays achievable in the laboratory by means of diamond anvil cells. The effect is due to the perturbation of the nuclear Coulomb potential and decay Q-value by the electron environment, and is enhanced, in this case, by the high compressibility of Th. The Thomas-Fermi model, within the frame of the Feynman-Metropolis-Teller treatment of the equation of state, has been used for calculations. It is found that at a compression factor of 2 on the volume of the Wigner-Seitz cell, the fractional variation in the lifetime of Th is about -2 x (conservative estimate). Detailed experimental procedures to measure this effect by compressing Th metal in a diamond anvil cell are presented, where diagnostics is based on activity-vs-time recording on suitable lines of the decay γ-spectrum, e.g. the 2.614-MeV peak stemming from the disintegration of the d...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ECS Meeting Abstracts
Bookmarks Related papers MentionsView impact
Journal of Nuclear Engineering and Radiation Science
This paper focuses on the TRACE code assessment for helium-cooled systems thermal-hydraulic analy... more This paper focuses on the TRACE code assessment for helium-cooled systems thermal-hydraulic analysis. In the frame of the GoFastR (gas cooled fast reactor) European Collaborative Project, ENEA has offered some selected experimental data for the organization of a benchmark exercise aimed at the validation of the system and CFD codes for the gas reactor transient analyses. One of the Research Center Řež teams participated in it with a CFD code application. Now, the experimental data are used in order to assess the TRACE code for the ongoing high-temperature helium loop (HTHL-2) licensing process. The results of the TRACE calculations agreed very well with the experimental measurements (often within the experimental uncertainties) data provided by the He-FUS3 facility, indicating that the code, despite developed for water coolant applications, if an appropriately tuned input is adopted, it can also be suitable for reasonably accurate gas technology thermo-hydraulic simulations.
Bookmarks Related papers MentionsView impact
Fusion Science and Technology
Bookmarks Related papers MentionsView impact
Fusion Science and Technology
Bookmarks Related papers MentionsView impact
Transactions of the Institute of Metal Finishing, Jun 30, 2006
ABSTRACT This paper deals with a study of the adsorption behaviour of three molecules which can b... more ABSTRACT This paper deals with a study of the adsorption behaviour of three molecules which can be employed as levellers in Cu electrochemical plating from acidic sulphate solutions: 4cyanopyridine (4CP), 3-diethylamino-7-(4-dimethylaminophenylazo)-5-phenylphenazinium chloride (Janus Green B, JGB) and a benzyl-phenyl modified polyethyleneimine (BPPEI). This investigation was carried out by in situ surface enhanced Raman spectroscopy (SERS) during electroplating and by in situ electroreflectance spectroscopy (ERS) on electrodeposited Cu layers. Variations of SERS effect with potential and potentiostatic polarisation time were studied. Cathodic reactivity of JGB and BPPEI was highlighted by the analysis of spectral changes as a function of applied potential and by time resolved spectroscopy. The formation of surface electronic states related to the formation of chemisorption bonds between the levellers and the Cu electrode was revealed by ERS.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Uploads
Papers by Vincenzo Romanello