Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants: Model extension to more general conditions

Jarmo Lehikoinen, Markus Olin

Research output: Book/ReportReport

Abstract

In this study, the role of the porous oxide film, deposited on top of the primary passive (compact) film, to control activity incorporation on the primary circuit surfaces of nuclear power plants (NPPs) is investigated. To serve this purpose, a computerized steady-state transport model, previously developed for a simplified BWR case, has been extended to take into consideration more general high-temperature aqueous and oxide compositions. In practical terms, computationally laborious multi-species reactions for ions, aqueous complexes, precipitates and dissolved gases as well as three types of boundary conditions at the compact film/porous film interface can now be included in the revised model. The model is rendered flexible enough to enable comparison of the effects of various NPP operating conditions, including those prevailing in PWRs. In this report, results calculated with the revised transport model for a BWR system are presented and discussed. The results allow, among other things, a qualitative evaluation of the fate of soluble, radioactive minority species within the pore fluid of the porous film à priori. A further elaboration of this system was highly warranted in that it serves as a template when moving to computationally more demanding PWR conditions. An outline of a technique to incorporate adsorption by way of mechanistic surface complexation into the transport model is also given.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages24
ISBN (Print)951-38-5955-X
Publication statusPublished - 2002
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Tiedotteita - Meddelanden - Research Notes
Number2131
ISSN1235-0605

Fingerprint

Nuclear power plants
Oxide films
Complexation
Oxides
Precipitates
Gases
Boundary conditions
Ions
Adsorption
Fluids
Networks (circuits)
Chemical analysis
Temperature

Keywords

  • nuclear power plants
  • iron
  • corrosion
  • oxide films
  • high temperature
  • adsorption
  • complex formation
  • transport modelling
  • water chemistry
  • hematite

Cite this

Lehikoinen, J., & Olin, M. (2002). Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants: Model extension to more general conditions. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 2131
Lehikoinen, Jarmo ; Olin, Markus. / Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants : Model extension to more general conditions. Espoo : VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2131).
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Lehikoinen, J & Olin, M 2002, Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants: Model extension to more general conditions. VTT Tiedotteita - Meddelanden - Research Notes, no. 2131, VTT Technical Research Centre of Finland, Espoo.

Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants : Model extension to more general conditions. / Lehikoinen, Jarmo; Olin, Markus.

Espoo : VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2131).

Research output: Book/ReportReport

TY - BOOK

T1 - Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants

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AU - Lehikoinen, Jarmo

AU - Olin, Markus

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N2 - In this study, the role of the porous oxide film, deposited on top of the primary passive (compact) film, to control activity incorporation on the primary circuit surfaces of nuclear power plants (NPPs) is investigated. To serve this purpose, a computerized steady-state transport model, previously developed for a simplified BWR case, has been extended to take into consideration more general high-temperature aqueous and oxide compositions. In practical terms, computationally laborious multi-species reactions for ions, aqueous complexes, precipitates and dissolved gases as well as three types of boundary conditions at the compact film/porous film interface can now be included in the revised model. The model is rendered flexible enough to enable comparison of the effects of various NPP operating conditions, including those prevailing in PWRs. In this report, results calculated with the revised transport model for a BWR system are presented and discussed. The results allow, among other things, a qualitative evaluation of the fate of soluble, radioactive minority species within the pore fluid of the porous film à priori. A further elaboration of this system was highly warranted in that it serves as a template when moving to computationally more demanding PWR conditions. An outline of a technique to incorporate adsorption by way of mechanistic surface complexation into the transport model is also given.

AB - In this study, the role of the porous oxide film, deposited on top of the primary passive (compact) film, to control activity incorporation on the primary circuit surfaces of nuclear power plants (NPPs) is investigated. To serve this purpose, a computerized steady-state transport model, previously developed for a simplified BWR case, has been extended to take into consideration more general high-temperature aqueous and oxide compositions. In practical terms, computationally laborious multi-species reactions for ions, aqueous complexes, precipitates and dissolved gases as well as three types of boundary conditions at the compact film/porous film interface can now be included in the revised model. The model is rendered flexible enough to enable comparison of the effects of various NPP operating conditions, including those prevailing in PWRs. In this report, results calculated with the revised transport model for a BWR system are presented and discussed. The results allow, among other things, a qualitative evaluation of the fate of soluble, radioactive minority species within the pore fluid of the porous film à priori. A further elaboration of this system was highly warranted in that it serves as a template when moving to computationally more demanding PWR conditions. An outline of a technique to incorporate adsorption by way of mechanistic surface complexation into the transport model is also given.

KW - nuclear power plants

KW - iron

KW - corrosion

KW - oxide films

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KW - adsorption

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KW - water chemistry

KW - hematite

M3 - Report

SN - 951-38-5955-X

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PB - VTT Technical Research Centre of Finland

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Lehikoinen J, Olin M. Modelling the transport in the porous layer of oxide films formed on material surfaces in nuclear power plants: Model extension to more general conditions. Espoo: VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2131).