Status report on project MICRIN, Mitigation of Crack Initiation

    Research output: Book/ReportReport

    Abstract

    Environmentally assisted cracking, EAC, is one of the major degradation modes in nuclear power plants. Good knowledge has been achieved on parameters influencing EAC crack growth, and disposition curves for EAC crack growth rates in especially BWR and BWRIHWC conditions are available for low alloy steels, stainless steels and many Ni-based alloys. EAC is the result of a combination of a susceptible material, environment and stress. Multitudes of affecting parameters are known and their influence on crack growth rate has been quantified. A white paper on crack initiation of structural materials in LWRs was written within the NULl FE project in 2011, after which a EU project proposal was prepared. This proposal was, however not approved for funding, and the decision was made between the partners to start an in-kind project, MICRIN, mitigation of crack initiation. Simultaneously, investigations on initiation susceptibility have been performed in the SAFIR2014 ENVIS project on nickel-based materials. The MICRIN project suits thus well within the scope of ENVIS. The main objective of the MICRIN project is to develop an accelerated test method for stress corrosion cracking initiation. The accelerated test should be able to find stress thresholds for crack initiation for some relevant corrosion systems and ways to mitigate the crack initiation. The accelerated test technique proposed is the use of a tapered specimen. Tailored, Sidoped stainless steel, also used in the PERFORM60 project is available at SCK-CEN. This report gives the status of the MICRIN project, the time schedule of which has been delayed due to delays in specimen manufacturing.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages7
    Publication statusPublished - 2014
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesHelsinki University of Technology: Systems Analysis Laboratory. A: Research Reports
    NumberVTT-R-05439-14

    Fingerprint

    Crack initiation
    Crack propagation
    Stainless steel
    Stress corrosion cracking
    High strength steel
    Nuclear power plants
    Nickel
    Corrosion
    Degradation

    Keywords

    • staineless steel
    • initiation testing
    • project plan

    Cite this

    Ehrnsten, U. (2014). Status report on project MICRIN, Mitigation of Crack Initiation. VTT Technical Research Centre of Finland. Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports, No. VTT-R-05439-14
    Ehrnsten, Ulla. / Status report on project MICRIN, Mitigation of Crack Initiation. VTT Technical Research Centre of Finland, 2014. 7 p. (Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports; No. VTT-R-05439-14).
    @book{a7d1497b5c62472199323c4f0c86e8f0,
    title = "Status report on project MICRIN, Mitigation of Crack Initiation",
    abstract = "Environmentally assisted cracking, EAC, is one of the major degradation modes in nuclear power plants. Good knowledge has been achieved on parameters influencing EAC crack growth, and disposition curves for EAC crack growth rates in especially BWR and BWRIHWC conditions are available for low alloy steels, stainless steels and many Ni-based alloys. EAC is the result of a combination of a susceptible material, environment and stress. Multitudes of affecting parameters are known and their influence on crack growth rate has been quantified. A white paper on crack initiation of structural materials in LWRs was written within the NULl FE project in 2011, after which a EU project proposal was prepared. This proposal was, however not approved for funding, and the decision was made between the partners to start an in-kind project, MICRIN, mitigation of crack initiation. Simultaneously, investigations on initiation susceptibility have been performed in the SAFIR2014 ENVIS project on nickel-based materials. The MICRIN project suits thus well within the scope of ENVIS. The main objective of the MICRIN project is to develop an accelerated test method for stress corrosion cracking initiation. The accelerated test should be able to find stress thresholds for crack initiation for some relevant corrosion systems and ways to mitigate the crack initiation. The accelerated test technique proposed is the use of a tapered specimen. Tailored, Sidoped stainless steel, also used in the PERFORM60 project is available at SCK-CEN. This report gives the status of the MICRIN project, the time schedule of which has been delayed due to delays in specimen manufacturing.",
    keywords = "staineless steel, initiation testing, project plan",
    author = "Ulla Ehrnsten",
    note = "Project code: 85616",
    year = "2014",
    language = "English",
    series = "Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports",
    publisher = "VTT Technical Research Centre of Finland",
    number = "VTT-R-05439-14",
    address = "Finland",

    }

    Ehrnsten, U 2014, Status report on project MICRIN, Mitigation of Crack Initiation. Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports, no. VTT-R-05439-14, VTT Technical Research Centre of Finland.

    Status report on project MICRIN, Mitigation of Crack Initiation. / Ehrnsten, Ulla.

    VTT Technical Research Centre of Finland, 2014. 7 p. (Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports; No. VTT-R-05439-14).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Status report on project MICRIN, Mitigation of Crack Initiation

    AU - Ehrnsten, Ulla

    N1 - Project code: 85616

    PY - 2014

    Y1 - 2014

    N2 - Environmentally assisted cracking, EAC, is one of the major degradation modes in nuclear power plants. Good knowledge has been achieved on parameters influencing EAC crack growth, and disposition curves for EAC crack growth rates in especially BWR and BWRIHWC conditions are available for low alloy steels, stainless steels and many Ni-based alloys. EAC is the result of a combination of a susceptible material, environment and stress. Multitudes of affecting parameters are known and their influence on crack growth rate has been quantified. A white paper on crack initiation of structural materials in LWRs was written within the NULl FE project in 2011, after which a EU project proposal was prepared. This proposal was, however not approved for funding, and the decision was made between the partners to start an in-kind project, MICRIN, mitigation of crack initiation. Simultaneously, investigations on initiation susceptibility have been performed in the SAFIR2014 ENVIS project on nickel-based materials. The MICRIN project suits thus well within the scope of ENVIS. The main objective of the MICRIN project is to develop an accelerated test method for stress corrosion cracking initiation. The accelerated test should be able to find stress thresholds for crack initiation for some relevant corrosion systems and ways to mitigate the crack initiation. The accelerated test technique proposed is the use of a tapered specimen. Tailored, Sidoped stainless steel, also used in the PERFORM60 project is available at SCK-CEN. This report gives the status of the MICRIN project, the time schedule of which has been delayed due to delays in specimen manufacturing.

    AB - Environmentally assisted cracking, EAC, is one of the major degradation modes in nuclear power plants. Good knowledge has been achieved on parameters influencing EAC crack growth, and disposition curves for EAC crack growth rates in especially BWR and BWRIHWC conditions are available for low alloy steels, stainless steels and many Ni-based alloys. EAC is the result of a combination of a susceptible material, environment and stress. Multitudes of affecting parameters are known and their influence on crack growth rate has been quantified. A white paper on crack initiation of structural materials in LWRs was written within the NULl FE project in 2011, after which a EU project proposal was prepared. This proposal was, however not approved for funding, and the decision was made between the partners to start an in-kind project, MICRIN, mitigation of crack initiation. Simultaneously, investigations on initiation susceptibility have been performed in the SAFIR2014 ENVIS project on nickel-based materials. The MICRIN project suits thus well within the scope of ENVIS. The main objective of the MICRIN project is to develop an accelerated test method for stress corrosion cracking initiation. The accelerated test should be able to find stress thresholds for crack initiation for some relevant corrosion systems and ways to mitigate the crack initiation. The accelerated test technique proposed is the use of a tapered specimen. Tailored, Sidoped stainless steel, also used in the PERFORM60 project is available at SCK-CEN. This report gives the status of the MICRIN project, the time schedule of which has been delayed due to delays in specimen manufacturing.

    KW - staineless steel

    KW - initiation testing

    KW - project plan

    M3 - Report

    T3 - Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports

    BT - Status report on project MICRIN, Mitigation of Crack Initiation

    PB - VTT Technical Research Centre of Finland

    ER -

    Ehrnsten U. Status report on project MICRIN, Mitigation of Crack Initiation. VTT Technical Research Centre of Finland, 2014. 7 p. (Helsinki University of Technology: Systems Analysis Laboratory. A: Research Reports; No. VTT-R-05439-14).