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  • Methodology for Assessing Pipe Failure Rates in Advanced Water Cooled Reactor (WCRs)

    Closed for proposals

    Project Type

    Coordinated Research Project

    Project Code

    I31030

    CRP

    2171

    Approved Date

    13 July 2017

    Status

    Closed

    Start Date

    9 February 2018

    Expected End Date

    8 February 2022

    Completed Date

    22 December 2022

    Participating Countries

    Canada
    Germany
    Lithuania
    Malaysia
    Republic of Korea
    Russian Federation
    Tunisia
    United States of America

    Description

    The successful deployment of advanced WCR technologies includes the development of design certification probabilistic safety assessment (PSA) studies that among other aspects must also address piping reliability in multiple contexts. Based on five decades of extensive and documented national operating experiences on the pipe failure rates in current Water Cooled Reactors (WCRs) fleet, a new methodology to predict pipe failure rates in advanced WCRs will be suggested. In the absence of operating experience data of the advanced WCRs there is not yet a consensus technical approach of how to predict pipe failure rates in advanced WCRs. ?This CRP will provide Member States with an open access to a strong technical basis for establishing plant piping reliability parameters in support of design certification PSA studies, in-service inspection programme development, and operational support. It this way it will bring together the current state-of-knowledge on piping degradation and failures, and will address important area of the predictions of pipe failure rates in suggesting a new methodology consistent with?required standards and relevant to deployable advanced WCRs where coordination by the Agency will provide significant added value. Although the focus is on statistical models of piping reliability on the basis of operating experience data in the current WCRs fleet, other approaches to piping reliability parameter estimation, such as probabilistic fracture mechanics approaches, are not precluded from consideration. Additionally, this CRP will enable objective evaluation and the benchmark studies by the participating Member States. ?The research activities supported by this CRP will foster national excellence and international cooperation, promote sharing of newly developed knowledge and contribute to capacity building in developing countries.

    Objectives

    Assist the IAEA Member States in assessment of pipe failure rates in advanced WCRs for improved safety design, promote?international cooperation among IAEA Member States through the sharing of expertise and?participation in the common benchmark calculation.

    Specific objectives

    Develop course syllabi for training early-career engineers and scientists, and establish the opportunities for PhD dissertations.

    Collect data and analyze the best practices of the existing piping reliability analysis methodologies across the Member States.

    Successfully complete the benchmark sets and document lessons learned.

    Develop new methodology to predict pipe failure rates in advanced WCRs.

    Impact

    The successful deployment of advanced water cooled reactor technologies includes the development of design certification probabilistic safety assessment studies and reliability and integrity management programmes for ageing management and in-service inspection. Considerations of piping reliability are essential elements of both. A well-recognized technical challenge in the development of probabilistic pipe failure metrics applicable to advanced water cooled reactors is the scarcity, or lack of relevant operating experience data on which to base or inform the piping reliability parameter assessment. Therefore to assist Member States in applying adequate methodologies to pipe failure rates analysis in advanced water cooled reactors, this CRP project entitled Methodology for Assessing Pipe Failure Rates in Advanced Water Cooled Reactors (2018-2021), developed new knowledge on technical insights from benchmarking different methods for predicting pipe failure rates in water cooled reactors and provided a comprehensive review of adequate methodology and good practices for the assessment of piping reliability parameters for advanced water cooled reactors.

    Relevance

    This CRP comprised a coordinated set of activities in successfully and adequately fulfilled the objectives and responded to the Member States needs to screen for correct application of methodology in assessing pipe failure rates in advanced water cooled reactors (that may lead to various accidents) based on existing plant data and state-of-the-art knowledge relevant to applicability of various methodologies. TECDOC and NES reflects and explain the technical background, methodologies and best practices of direct use by the technology vendors and designers.

    CRP Publications

    Type

    Journal Publication

    Year

    2019

    Publication URL

    https://www.sciencedirect.com/science/article/pii/S0149197019302069?via%3Dihub

    Description

    Review and categorization of existing studies on the estimation of probabilistic failure metrics for Reactor Coolant Pressure Boundary piping and steam generator tubes in Nuclear Power Plants, Progress in Nuclear Energy 118 (2020) 103105

    Country/Organization

    Austria

    Type

    Journal paper

    Year

    2021

    Publication URL

    https://www.sciencedirect.com/science/article/pii/S0308016121000867?via%3Dihub

    Description

    Comparison of sensitivity measures in probabilistic fracture mechanics, Journal of Pressure Vessels and Piping

    Country/Organization

    Austria

    Type

    Journal paper

    Year

    2022

    Publication URL

    https://www.sciencedirect.com/science/article/pii/S0029549322003417

    Description

    Estimation of pipe failure frequencies in the absence of operational experience data: A pilot study, Nuclear Engineering and Design

    Country/Organization

    Austria

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