Mock-up wall for NDT&E of NPP thick-walled reinforced concrete structures

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

Researchers

Research units

  • VTT Technical Research Centre of Finland

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.

Details

Original languageEnglish
Title of host publication12th European Conference on Non-Destructive Testing (ECNDT 2018)
Publication statusPublished - 1 Aug 2018
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Non-Destructive Testing - Gothenburg, Sweden
Duration: 11 Jun 201815 Jun 2018
Conference number: 12

Publication series

NameThe e-Journal of Nondestructive Testing
PublisherNDT.net
Number8
Volume23
ISSN (Electronic)1435-4934

Conference

ConferenceEuropean Conference on Non-Destructive Testing
Abbreviated titleECNDT 2018
CountrySweden
CityGothenburg
Period11/06/201815/06/2018

    Research areas

  • NDE, concrete, thick-walled, defects, deterioration, reinforcement

ID: 27811842