Water chemistry during hot functional testing of WWER reactors

Martin Bojinov, Timo Saario

    Research output: Book/ReportReportProfessional

    Abstract

    In contrast to the major sets of PWR chemistry guidelines, which follow similar water chemistry' control principles, the position with WWER guidelines is that there is no single document that describes the rationales for controlling individual chemical species and the limit values recommended. There are standards produced by design and research organizations, but no document has been prepared by a wider chemistry community that includes plant chemists from different WWER operating countries, which addresses operational chemistry optimization issues and is available to WWER operators in all countries. Thus sources of information concerning the water chemistry during HFT of WWERs are sparse and a systematization of the available information on the process is needed. In the present report, the main principles of the controlled primary water chemistry applied during the hot functional tests are reviewed and importance of the water chemistry, technological and other relevant parameters is emphasized regarding the quality of the passive layer formed on the primary system surfaces. The first perational experience obtained in recently commissioned WWER units is presented with respect to the corrosion products in the coolant and surface activities. Effect of the initial passivation performed during hot functional tests and the primary water chemistry on corrosion products radioactivity level and radiation situation is discussed.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages16
    Publication statusPublished - 2015
    MoE publication typeD4 Published development or research report or study

    Publication series

    NameResearch Report
    PublisherVTT
    VolumeVTT-R-02915-15

    Fingerprint

    Water
    Testing
    Corrosion
    Radioactivity
    Passivation
    Coolants
    Mathematical operators
    Radiation

    Keywords

    • WWER
    • HFT
    • passivation
    • oxide film
    • stainless steel

    Cite this

    Bojinov, M., & Saario, T. (2015). Water chemistry during hot functional testing of WWER reactors. VTT Technical Research Centre of Finland. VTT Research Report, Vol.. VTT-R-02915-15
    Bojinov, Martin ; Saario, Timo. / Water chemistry during hot functional testing of WWER reactors. VTT Technical Research Centre of Finland, 2015. 16 p. (VTT Research Report, Vol. VTT-R-02915-15).
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    keywords = "WWER, HFT, passivation, oxide film, stainless steel",
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    Bojinov, M & Saario, T 2015, Water chemistry during hot functional testing of WWER reactors. VTT Research Report, vol. VTT-R-02915-15, VTT Technical Research Centre of Finland.

    Water chemistry during hot functional testing of WWER reactors. / Bojinov, Martin; Saario, Timo.

    VTT Technical Research Centre of Finland, 2015. 16 p. (VTT Research Report, Vol. VTT-R-02915-15).

    Research output: Book/ReportReportProfessional

    TY - BOOK

    T1 - Water chemistry during hot functional testing of WWER reactors

    AU - Bojinov, Martin

    AU - Saario, Timo

    N1 - Project code: 101928

    PY - 2015

    Y1 - 2015

    N2 - In contrast to the major sets of PWR chemistry guidelines, which follow similar water chemistry' control principles, the position with WWER guidelines is that there is no single document that describes the rationales for controlling individual chemical species and the limit values recommended. There are standards produced by design and research organizations, but no document has been prepared by a wider chemistry community that includes plant chemists from different WWER operating countries, which addresses operational chemistry optimization issues and is available to WWER operators in all countries. Thus sources of information concerning the water chemistry during HFT of WWERs are sparse and a systematization of the available information on the process is needed. In the present report, the main principles of the controlled primary water chemistry applied during the hot functional tests are reviewed and importance of the water chemistry, technological and other relevant parameters is emphasized regarding the quality of the passive layer formed on the primary system surfaces. The first perational experience obtained in recently commissioned WWER units is presented with respect to the corrosion products in the coolant and surface activities. Effect of the initial passivation performed during hot functional tests and the primary water chemistry on corrosion products radioactivity level and radiation situation is discussed.

    AB - In contrast to the major sets of PWR chemistry guidelines, which follow similar water chemistry' control principles, the position with WWER guidelines is that there is no single document that describes the rationales for controlling individual chemical species and the limit values recommended. There are standards produced by design and research organizations, but no document has been prepared by a wider chemistry community that includes plant chemists from different WWER operating countries, which addresses operational chemistry optimization issues and is available to WWER operators in all countries. Thus sources of information concerning the water chemistry during HFT of WWERs are sparse and a systematization of the available information on the process is needed. In the present report, the main principles of the controlled primary water chemistry applied during the hot functional tests are reviewed and importance of the water chemistry, technological and other relevant parameters is emphasized regarding the quality of the passive layer formed on the primary system surfaces. The first perational experience obtained in recently commissioned WWER units is presented with respect to the corrosion products in the coolant and surface activities. Effect of the initial passivation performed during hot functional tests and the primary water chemistry on corrosion products radioactivity level and radiation situation is discussed.

    KW - WWER

    KW - HFT

    KW - passivation

    KW - oxide film

    KW - stainless steel

    M3 - Report

    T3 - Research Report

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    ER -

    Bojinov M, Saario T. Water chemistry during hot functional testing of WWER reactors. VTT Technical Research Centre of Finland, 2015. 16 p. (VTT Research Report, Vol. VTT-R-02915-15).