The effect of geometry on radionuclide transport in a bedrock fracture

Karita Kajanto

Research output: Book/ReportReport

Abstract

a) Background b) What should be done? c) Methods and tool a) Estimating the long term safety of a geological nuclear waste repository is a complicated computational problem. Numerous scenarios of system failure must be taken into account. Released radionuclides can be transported long distances along the groundwater of rock fractures. Sorption into the bedrock may also take place. In the case of a release of radionuclides to the groundwater, transport properties in fractures must be well known. A common approximation of rock fracture flow is flow between parallel plates. The shape of natural fractures, however, is uneven and irregular. Varying shape and size causes dispersion that affects transport. b) Study the effect of dispersion caused by variable aperture fractures to the transport and flow properties. Build models of a single rock fracture in different credible geometries. Calculate the flow field and transport of a pulse of radionuclides trough the fractures. Also, calculate the retention of nuclides caused by matrix diffusion. Compare the results to the parallelplate case. c) Numerical methods: FEM with time integration. COMSOL Multiphysics 4.2a, CAD Import Module, Subsurface Flow Module, Chemical Reaction Engineering Module.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages34
ISBN (Electronic)978-951-38-8055-2
Publication statusPublished - 2013
MoE publication typeNot Eligible

Publication series

SeriesVTT Technology
Number128
ISSN2242-1211

Fingerprint

radionuclide
bedrock
geometry
rock
fracture flow
fracture aperture
groundwater
computer aided design
subsurface flow
repository
chemical reaction
radioactive waste
numerical method
flow field
import
trough
sorption
effect
safety
engineering

Keywords

  • radionuclide transport
  • bedrock fracture
  • matrix diffusion
  • parallel plate approximation

Cite this

Kajanto, K. (2013). The effect of geometry on radionuclide transport in a bedrock fracture. Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 128
Kajanto, Karita. / The effect of geometry on radionuclide transport in a bedrock fracture. Espoo : VTT Technical Research Centre of Finland, 2013. 34 p. (VTT Technology; No. 128).
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Kajanto, K 2013, The effect of geometry on radionuclide transport in a bedrock fracture. VTT Technology, no. 128, VTT Technical Research Centre of Finland, Espoo.

The effect of geometry on radionuclide transport in a bedrock fracture. / Kajanto, Karita.

Espoo : VTT Technical Research Centre of Finland, 2013. 34 p. (VTT Technology; No. 128).

Research output: Book/ReportReport

TY - BOOK

T1 - The effect of geometry on radionuclide transport in a bedrock fracture

AU - Kajanto, Karita

N1 - Project code: 77468

PY - 2013

Y1 - 2013

N2 - a) Background b) What should be done? c) Methods and tool a) Estimating the long term safety of a geological nuclear waste repository is a complicated computational problem. Numerous scenarios of system failure must be taken into account. Released radionuclides can be transported long distances along the groundwater of rock fractures. Sorption into the bedrock may also take place. In the case of a release of radionuclides to the groundwater, transport properties in fractures must be well known. A common approximation of rock fracture flow is flow between parallel plates. The shape of natural fractures, however, is uneven and irregular. Varying shape and size causes dispersion that affects transport. b) Study the effect of dispersion caused by variable aperture fractures to the transport and flow properties. Build models of a single rock fracture in different credible geometries. Calculate the flow field and transport of a pulse of radionuclides trough the fractures. Also, calculate the retention of nuclides caused by matrix diffusion. Compare the results to the parallelplate case. c) Numerical methods: FEM with time integration. COMSOL Multiphysics 4.2a, CAD Import Module, Subsurface Flow Module, Chemical Reaction Engineering Module.

AB - a) Background b) What should be done? c) Methods and tool a) Estimating the long term safety of a geological nuclear waste repository is a complicated computational problem. Numerous scenarios of system failure must be taken into account. Released radionuclides can be transported long distances along the groundwater of rock fractures. Sorption into the bedrock may also take place. In the case of a release of radionuclides to the groundwater, transport properties in fractures must be well known. A common approximation of rock fracture flow is flow between parallel plates. The shape of natural fractures, however, is uneven and irregular. Varying shape and size causes dispersion that affects transport. b) Study the effect of dispersion caused by variable aperture fractures to the transport and flow properties. Build models of a single rock fracture in different credible geometries. Calculate the flow field and transport of a pulse of radionuclides trough the fractures. Also, calculate the retention of nuclides caused by matrix diffusion. Compare the results to the parallelplate case. c) Numerical methods: FEM with time integration. COMSOL Multiphysics 4.2a, CAD Import Module, Subsurface Flow Module, Chemical Reaction Engineering Module.

KW - radionuclide transport

KW - bedrock fracture

KW - matrix diffusion

KW - parallel plate approximation

M3 - Report

T3 - VTT Technology

BT - The effect of geometry on radionuclide transport in a bedrock fracture

PB - VTT Technical Research Centre of Finland

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ER -

Kajanto K. The effect of geometry on radionuclide transport in a bedrock fracture. Espoo: VTT Technical Research Centre of Finland, 2013. 34 p. (VTT Technology; No. 128).