Mock-up wall for non-destructive testing and evaluation of thick reinforced concrete structures in nuclear power plants

Fahim Al-Neshawy, Teemu Ojala, Miguel Ferreira, Jari Puttonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The reinforced concrete structures in nuclear power plants (NPP) are deteriorated due to aging or environmental stressor effects during the lifetime of the power plant. To assess the construction quality and long-term performance of the reinforced concrete structures, different non-destructive testing (NDT) and evaluation (NDE) methods are used. Some of the challenges for assessing the performance of these structures are (i) The assessment could be performed only during the annual overhauls when testing is time-limited, (ii) the accuracy and reliability of the available NDT testing devices, (iii) uncertainty of the international uniformity of the methods used for NDT tests, and (iv) the creditability of results and analyses. To overcome those challenges, a mock-up wall that is representative of NPP containment concrete cross sections is constructed for the critical investigation of NDT&E methods and techniques. Simulated defects are applied to the mock-up wall. These defects are representing the most common types of defects in concrete structures such as: dimensional errors; finishing errors; honeycombing; cracking, delamination due to structure stresses or deterioration mechanisms; embedded foreign objects in the concrete; voids adjacent to liner and voids in grouted tendon ducts for the post-tensioned structures. The aim of this paper is to present to discuss the conceptual design of the mock-up, which includes (i) the concrete properties, (ii) reinforcement, (ii) tendon ducts, (iii) types of the simulated defects. The paper also introduces the NDT&E methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. The mock-up wall for NPP thick-walled reinforced concrete structures will enable the assessment of NDT&E methods and experts experience, and provide an important and very much need education perspective for future NDE experts.
Original languageEnglish
Number of pages8
JournalThe e-Journal of Nondestructive Testing & Ultrasonics
Volume23
Issue number8
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed
Event12th European Conference on Non-Destructive Testing, ECNDT 2018 - Gothenburg, Sweden
Duration: 11 Jun 201815 Jun 2018

Fingerprint

Nondestructive examination
Concrete construction
Nuclear power plants
Reinforced concrete
Defects
Tendons
Concretes
Ducts
Testing
Conceptual design
Delamination
Environmental impact
Deterioration
Reinforcement
Power plants
Aging of materials
Education

Cite this

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title = "Mock-up wall for non-destructive testing and evaluation of thick reinforced concrete structures in nuclear power plants",
abstract = "The reinforced concrete structures in nuclear power plants (NPP) are deteriorated due to aging or environmental stressor effects during the lifetime of the power plant. To assess the construction quality and long-term performance of the reinforced concrete structures, different non-destructive testing (NDT) and evaluation (NDE) methods are used. Some of the challenges for assessing the performance of these structures are (i) The assessment could be performed only during the annual overhauls when testing is time-limited, (ii) the accuracy and reliability of the available NDT testing devices, (iii) uncertainty of the international uniformity of the methods used for NDT tests, and (iv) the creditability of results and analyses. To overcome those challenges, a mock-up wall that is representative of NPP containment concrete cross sections is constructed for the critical investigation of NDT&E methods and techniques. Simulated defects are applied to the mock-up wall. These defects are representing the most common types of defects in concrete structures such as: dimensional errors; finishing errors; honeycombing; cracking, delamination due to structure stresses or deterioration mechanisms; embedded foreign objects in the concrete; voids adjacent to liner and voids in grouted tendon ducts for the post-tensioned structures. The aim of this paper is to present to discuss the conceptual design of the mock-up, which includes (i) the concrete properties, (ii) reinforcement, (ii) tendon ducts, (iii) types of the simulated defects. The paper also introduces the NDT&E methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. The mock-up wall for NPP thick-walled reinforced concrete structures will enable the assessment of NDT&E methods and experts experience, and provide an important and very much need education perspective for future NDE experts.",
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Mock-up wall for non-destructive testing and evaluation of thick reinforced concrete structures in nuclear power plants. / Al-Neshawy, Fahim; Ojala, Teemu; Ferreira, Miguel; Puttonen, Jari.

In: The e-Journal of Nondestructive Testing & Ultrasonics, Vol. 23, No. 8, 2018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Al-Neshawy, Fahim

AU - Ojala, Teemu

AU - Ferreira, Miguel

AU - Puttonen, Jari

PY - 2018

Y1 - 2018

N2 - The reinforced concrete structures in nuclear power plants (NPP) are deteriorated due to aging or environmental stressor effects during the lifetime of the power plant. To assess the construction quality and long-term performance of the reinforced concrete structures, different non-destructive testing (NDT) and evaluation (NDE) methods are used. Some of the challenges for assessing the performance of these structures are (i) The assessment could be performed only during the annual overhauls when testing is time-limited, (ii) the accuracy and reliability of the available NDT testing devices, (iii) uncertainty of the international uniformity of the methods used for NDT tests, and (iv) the creditability of results and analyses. To overcome those challenges, a mock-up wall that is representative of NPP containment concrete cross sections is constructed for the critical investigation of NDT&E methods and techniques. Simulated defects are applied to the mock-up wall. These defects are representing the most common types of defects in concrete structures such as: dimensional errors; finishing errors; honeycombing; cracking, delamination due to structure stresses or deterioration mechanisms; embedded foreign objects in the concrete; voids adjacent to liner and voids in grouted tendon ducts for the post-tensioned structures. The aim of this paper is to present to discuss the conceptual design of the mock-up, which includes (i) the concrete properties, (ii) reinforcement, (ii) tendon ducts, (iii) types of the simulated defects. The paper also introduces the NDT&E methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. The mock-up wall for NPP thick-walled reinforced concrete structures will enable the assessment of NDT&E methods and experts experience, and provide an important and very much need education perspective for future NDE experts.

AB - The reinforced concrete structures in nuclear power plants (NPP) are deteriorated due to aging or environmental stressor effects during the lifetime of the power plant. To assess the construction quality and long-term performance of the reinforced concrete structures, different non-destructive testing (NDT) and evaluation (NDE) methods are used. Some of the challenges for assessing the performance of these structures are (i) The assessment could be performed only during the annual overhauls when testing is time-limited, (ii) the accuracy and reliability of the available NDT testing devices, (iii) uncertainty of the international uniformity of the methods used for NDT tests, and (iv) the creditability of results and analyses. To overcome those challenges, a mock-up wall that is representative of NPP containment concrete cross sections is constructed for the critical investigation of NDT&E methods and techniques. Simulated defects are applied to the mock-up wall. These defects are representing the most common types of defects in concrete structures such as: dimensional errors; finishing errors; honeycombing; cracking, delamination due to structure stresses or deterioration mechanisms; embedded foreign objects in the concrete; voids adjacent to liner and voids in grouted tendon ducts for the post-tensioned structures. The aim of this paper is to present to discuss the conceptual design of the mock-up, which includes (i) the concrete properties, (ii) reinforcement, (ii) tendon ducts, (iii) types of the simulated defects. The paper also introduces the NDT&E methods and techniques that are suitable for assessing the condition of the mock-up wall under the real environmental conditions. The mock-up wall for NPP thick-walled reinforced concrete structures will enable the assessment of NDT&E methods and experts experience, and provide an important and very much need education perspective for future NDE experts.

M3 - Article

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JO - The e-Journal of Nondestructive Testing & Ultrasonics

JF - The e-Journal of Nondestructive Testing & Ultrasonics

SN - 1435-4934

IS - 8

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