Design, construction, and NDT of a mock-up for reinforced concrete walls in NPP

Fahim Al-Neshawy, Rui Miguel Ferreira, Edgar Bohner, Teemu Ojala, Ville Sjöblom, Ernst Niederleithinger, Ute Effner, Jari Puttonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Construction methods, environmental stressors, and aging factors are the main causes for defects of reinforced concrete in nuclear power plants (NPP). These defects are typically occurred as corrosion of reinforcement steel, delamination, cracks, malfunction of post-tensioning or steel composite systems etc. Some of the challenges for assessing the performance of these structures by nondestructive testing methods (NDT) are that the assessment could be performed only during the annual overhauls when testing is time-limited and uncertainty of the accuracy and reliability of the available NDT testing devices combined with the lack of the international uniformity of the methods used for NDT tests.
    To overcome these challenges, a mock-up wall representing a section of the concrete containment of the NPP. The mock-up wall included simulated defects, which mimic the most common types of defects in NPP concrete structures such as dimensional errors, honeycombing, delamination, defects adjacent to the steel liner and voids in grouted tendon ducts for the posttensioned
    structures. This paper introduce the design and construction of the wall including the concrete properties, reinforcement, tendon ducts and the types of the simulated defects. The paper also introduces the NDT methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. These techniques include mechanical
    methods as rebound hammer, ultrasonic and electromagnetic methods. This mock-up wall will enable to investigate reliably available NDT methods and experts’ skills providing also an important and very much need educational platform for future NDE experts.
    Original languageEnglish
    Title of host publicationSMiRT 25, August 4-9, 2019, Charlotte, NC, USA
    Subtitle of host publicationDivision IX
    PublisherInternational Association for Structural Mechanics in Reactor Technology IASMiRT
    Number of pages12
    Publication statusPublished - 2019
    MoE publication typeA4 Article in a conference publication
    Event25th International Conference on Structural Mechanics in Reactor Technology, SMiRT 25 - Charlotte, United States
    Duration: 4 Aug 20199 Aug 2019
    Conference number: 25


    Conference25th International Conference on Structural Mechanics in Reactor Technology, SMiRT 25
    Abbreviated titleSMiRT
    Country/TerritoryUnited States


    • NDE
    • concrete
    • thick-walled
    • defects
    • deterioration
    • steel liner


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