Browsing by Author "Martínez Torrents, Albert"

Now showing items 1-14 of 14

    • Actinide mobility at hyperalkaline and oxidant media. Use of spectrosphotometrical techniques 

      Martínez Torrents, Albert (Universitat Politècnica de Catalunya, 2010-06)
      Master thesis
      Restricted access - author's decision
      Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS) has been used to study the speciation of uranium(VI) at very alkaline pH. The hydroxocomplex UO2(OH)3 has been reported to be responsible for all uranium ...

    • Chlorine concentration modelling and supervision in water distribution systems 

      Pérez Magrané, Ramon; Martínez Torrents, Albert; Martínez del Álamo, Manuel; Grau Torrent, Sergi; Vinardell Magre, Laura; Tomàs Puig, Ricard; Martínez Lladó, Xavier; Jubany Güell, Irene (Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-26)
      Article
      Open Access
      The quality of the drinking water distributed through the networks has become the main concern of most operators. This work focuses on one of the most important variables of the drinking water distribution networks (WDN) ...

    • Contribution of phases segregated from the UO2 matrix to the release of radionuclides from spent nuclear fuel and duration of the Instant Release Fraction (IRF) 

      Espriu Gascon, Alexandra; Martínez Torrents, Albert; Serrano Purroy, Daniel; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi (Elsevier, 2020-04-15)
      Article
      Open Access
      During the dissolution of the spent nuclear fuel (SNF) some radionuclides are released to the solution simultaneously from different sources in the fuel. This is of particular importance to some radionuclides that contribute ...

    • Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH 

      Meca, S.; Martínez Torrents, Albert; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (2011)
      Article
      Open Access
      The formation of uranyl-peroxide complexes was studied at alkaline media by using UV-Visible spectrophotometry and the STAR code. Two different complexes were found at a H2O2/U(VI) ratio lower than 2. A graphical method ...

    • Dissolution of high burn-up spent nuclear fuel at high-pH 

      Iglesias Pérez, Luis; Kokinda, Jakub; Serrano Purroy, Daniel; Martínez Torrents, Albert; Casas Pons, Ignasi; Pablo Ribas, Joan de; Clarens Blanco, Frederic; Giménez Izquierdo, Francisco Javier (De Gruyter, 2023-10-09)
      Article
      Open Access
      The release of radionuclides from high-burnup spent nuclear fuel (SNF) segments was studied at pH = 13.2 as well as the effect of the presence of calcium and silicon. The aim was to ascertain the dissolution of SNF in ...

    • Effect of alkaline conditions on near-field processes of a spent nuclear fuel geological repository 

      Martínez Torrents, Albert (Universitat Politècnica de Catalunya, 2015-03-17)
      Doctoral thesis
      Open Access
      The contact ofthe spent nuclear fuel (SNF) with water dueto a failure in the canister would be a conservative but still plausible hypothesis in the safety assesment of a deep geologic repository (DGR). Concrete and ...

    • Incorporation of selenium(IV) and selenium(VI) on uranyl peroxide 

      Martínez Torrents, Albert; Giménez Izquierdo, Francisco Javier; Martínez Lledó, Xavier; Casas Pons, Ignasi; De pablo, J. (2015-01-01)
      Article
      Restricted access - publisher's policy
      © 2014, Akadémiai Kiadó, Budapest, Hungary. The sorption of Se(IV) and Se(VI) on uranium peroxide has been studied considering the sorption kinetics, the sorption isotherms and the effect of pH. Selenium sorption on studtite ...

    • Influence of the interpellet space to the Instant Release Fraction determination of a commercial UO2 Boiling Water Reactor Spent Nuclear Fuel 

      Martínez Torrents, Albert; Serrano Purroy, Daniel; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2018-02)
      Article
      Open Access
      The contact of the coolant with the fuel pin during irradiation produces a gradient of temperature in the fuel pellet that segregates the radionuclides (RN) depending on its volatility and reactivity. This segregation ...

    • Instant release fraction corrosion studies of commercial UO2 BWR spent nuclear fuel 

      Martínez Torrents, Albert; Serrano Purroy, Daniel; Sureda, R.; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2017-05-01)
      Article
      Open Access
      The instant release fraction of a spent nuclear fuel is a matter of concern in the performance assessment of a deep geological repository since it increases the radiological risk. Corrosion studies of two different spent ...

    • Modelling the release of Mo, Tc, Ru and Rh from high burnup spent nuclear fuel at alkaline and hyperalkaline pH 

      Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; García Gómez, Sonia; Serrano Purroy, Daniel; Iglesias Pérez, Luis; Clarens Blanco, Frederic; Martínez Torrents, Albert (Cambridge University Press, 2023-12-30)
      Article
      Open Access
      The present work shows experimental data on the release of some radionuclides that are forming the so-called e particles in the spent nuclear fuel (SNF): Mo, Tc, Ru and Rh. The leaching experiments were carried out with a ...

    • Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pH 

      García Gómez, Sonia; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Llorca Piqué, Jordi; Pablo Ribas, Joan de; Martínez Torrents, Albert; Clarens Blanco, Frederic; Kokinda, Jakub; Iglesias Pérez, Luis; Serrano Purroy, Daniel (Elsevier, 2023-01-01)
      Article
      Open Access
      This work presents experimental data and modelling of the release of Mo from high-burnup spent nuclear fuel (63 MWd/kgU) at two different pH values, 8.4 and 13.2 in air. The release of Mo from SF to the solution is around ...

    • Release of Cs, Sr and Rb from two high–burnup spent nuclear fuels: Effect of the dishing and the internal grain boundaries 

      Martínez Torrents, Albert; Serrano Purroy, Daniel; Kokinda, Jakub; Iglesias Pérez, Luis; Clarens Blanco, Frederic; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de (Elsevier, 2024-09-01)
      Article
      Restricted access - publisher's policy
      This work presents the results of the release of Cs, Sr and Rb from two different spent nuclear fuels (BWR fuel with a burnup of 58 GWd(tU)-1 and a PWR fuel with a burnup of 63 GWd(tU)-1). Dishing effect was observable in ...

    • UO2 as new filling material for cesium retention in high-level nuclear waste repositories 

      Martínez Torrents, Albert; Gimenez, Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi (2015-10-01)
      Article
      Open Access
      Depleted uranium dioxide has been proposed as an inert material to fill spent nuclear fuel canisters in geological repositories. Sorption capacity of this material to retain radionuclides released from the fuel was determined. ...

    • Uranium speciation studies at alkaline pH and in the presence of hydrogen peroxide using time-resolved laser-induced fluorescence spectroscopy 

      Martínez Torrents, Albert; Meca, Sandra; Baumann, Nils; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi (2013-05)
      Article
      Restricted access - publisher's policy
      Time-resolved laser-induced fluorescence spectroscopy (TRLFS) was used to study the speciation of uranium(VI) at very alkaline pH (11–13), at room temperature and in the absence of CO2. In this case, at pH = 11, two different ...