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@ARTICLE{Soler:907621,
      author       = {Soler, J. M. and Neretnieks, I. and Moreno, L. and Liu, L.
                      and Meng, S. and Svensson, U. and Iraola, A. and Ebrahimi,
                      H. and Trinchero, P. and Molinero, J. and Vidstrand, P. and
                      Deissmann, G. and Říha, J. and Hokr, M. and Vetešník, A.
                      and Vopálka, D. and Gvoždík, L. and Polák, M. and
                      Trpkošová, D. and Havlová, V. and Park, D.-K. and Ji,
                      S.-H. and Tachi, Y. and Ito, T. and Gylling, B. and Lanyon,
                      G. W.},
      title        = {{P}redictive {M}odeling of a {S}imple {F}ield {M}atrix
                      {D}iffusion {E}xperiment {A}ddressing {R}adionuclide
                      {T}ransport in {F}ractured {R}ock. {I}s {I}t {S}o
                      {S}traightforward?},
      journal      = {Nuclear technology},
      volume       = {208},
      number       = {6},
      issn         = {0029-5450},
      reportid     = {FZJ-2022-02110},
      pages        = {1059 - 1073},
      year         = {2022},
      abstract     = {The SKB GroundWater Flow and Transport of Solutes Task
                      Force is an international forum in the area of conceptual
                      and numerical modeling of groundwater flow and solute
                      transport in fractured rocksrelevant for the deep geological
                      disposal of radioactive waste. Two in situ matrix diffusion
                      experiments in crystalline rock (gneiss) were performed at
                      POSIVA’s ONKALO underground facility in Finland.
                      Syntheticgroundwater containing several conservative and
                      sorbing radiotracers was injected at one end of a borehole
                      interval and flowed along a thin annulus toward the opposite
                      end. Several teams performed predictivemodeling of the
                      tracer breakthrough curves using “conventional” modeling
                      approaches (constant diffusion and sorption in the rock, no
                      or minimum rock heterogeneity). Supporting information,
                      derived from small-scalelaboratory experiments, was
                      provided. The teams were free to implement different
                      concepts, use different codes, and apply the transport and
                      retention parameters that they considered to be most suited
                      (i.e., not a benchmark exercise). The main goal was the
                      comparison of the different sets of results and the analysis
                      of the possible differences for this relatively simple
                      experimental setup with a well-defined geometry. Even though
                      theexperiment was designed to study matrix diffusion, the
                      calculated peaks of the breakthrough curves were very
                      sensitive to the assumed magnitude of dispersion in the
                      borehole annulus. However, given the verydifferent
                      timescales for advection and matrix diffusion, the tails of
                      the curves provided information concerning diffusion and
                      retention in the rock matrix regardless of the magnitude of
                      dispersion. In addition, although the task was designed to
                      be a blind modeling exercise, the model results have also
                      been compared to the measured experimental breakthroughs.
                      Experimental results tend to show relatively small
                      activities, wide breakthroughs,and early first arrivals,
                      which are somewhat similar to model results using large
                      dispersivity values.},
      cin          = {IEK-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141)},
      pid          = {G:(DE-HGF)POF4-1411},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000728479700001},
      doi          = {10.1080/00295450.2021.1988822},
      url          = {https://juser.fz-juelich.de/record/907621},
}