Irradiation Effects on Concrete Structures

Kontani, Osamu; Ichikawa, Yoshikazu; Ishizawa, A.; Takizawa, Masayuki; Sato, Osamu

doi:10.1002/9781118536254.ch27

Cited by 33 publications

(42 citation statements)

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“…This result is almost consistent with the results of Dubrovskii et al (1966Dubrovskii et al ( , 1967Dubrovskii et al ( , 1968Dubrovskii et al ( , 1970, which concluded that compressive strength might be affected above a total fluence of ~5 × 10 19 n/cm 2 . On the contrary, Fujiwara et al (2009) and Kontani et al (2010) pointed out that Hilsdorf et al's (1978) experimental results included concrete or mortar that are not suitable for LWRs. Therefore, Maruyama et al (2013) summarized the relationship between neutron fluence and relative compressive strength ratio (Fc/Fco, ratio of the compressive strength of irradiated concrete to that of the reference concrete) for concrete or mortar applicable to concrete members in LWRs.…”

Section: Introductionmentioning

confidence: 96%

“…Several studies (Dubrovskii et al 1967;Elluech et al 1971;Pedersen 1971;Hilsdorf et al 1978;Kontani et al 2010;Maruyama et al 2012;Field et al 2015) have suggested that the mechanism of concrete deterioration due to irradiation is aggregate expansion that originates from metamictization or amorphization of silicious rock minerals due to irradiation (Primak et al 1955;Primak 1958;Elluech et al 1971;Eby et al 1992;Bonnet et al 1994;Douillard and Duraud 1996;Bolse 1999;Ewing et al 2000). Due to aggregate expansion, the mortar matrix in concrete is damaged, resulting in deterioration of concrete's physical properties, such as compressive strength and Young's modulus, such as in the case of alkali-silica reaction in concrete (Giorla et al 2015;.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Maruyama

Haba²,

Sato

et al. 2016

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For performance evaluation of existing reinforced concrete members under irradiation conditions, a numerical code called "DEVICE" (Damage EValuation for Irradiated ConcretE), which takes into account the heat, moisture, and radiation transport coupled with cement hydration, is proposed. This code is composed of the established computational cement-based material (CCBM) model and the one-dimensional deterministic transport Sn code "ANISN". In the proposed model, temperature-dependent irradiation-induced expansion of aggregate minerals and resultant strength deterioration of concrete are introduced. Currently, the knowledge and modeling of irradiation-induced expansion of aggregate mineral is limited only for α-quartz. DEVICE was used for evaluating the strength distribution of the decommissioned plant Japan Power Demonstration Reactor (JPDR). Compressive strength distribution in a concrete biological shielding (CBS) wall of the JPDR was obtained by core sampling, and the compressive loading test results were compared with the calculation results. This comparison proved the practicality potential of DEVICE to predict the concrete strength distribution in a CBS. In addition, concrete strength change and its distribution in a CBS of an anonymous two-loop pressurized water reactor was simulated by DEVICE. The contributing factors for the change in the distribution of concrete strength at the inner surface of the CBS are discussed. Furthermore, the ways of integrity evaluation other than the existing allowable fast neutron fluence method are proposed and discussed as follows: 1) mineral composition-based allowable fast neutron fluence; 2) strength prediction at the inner surface based on the expansion of mineral composition of aggregates and the lower limit curve of the ratio of compressive strength of the specimen after irradiation (Fc) to that of the reference specimen (Fco) as a function of concrete expansion; and 3) direct numerical calculation for seismic performance by considering irradiation-induced volume expansion and degradation of concrete.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Maruyama

Haba²,

Sato

et al. 2016

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“…However, in a national project organized by the Japan Nuclear Energy Safety Organization (partly a former organization in the NRA), the Hilsdorf compiled data were found to be unsuitable for this purpose because they did not cover the type of concrete used in LWRs (Kontani et al 2010). A national project has been launched to elucidate the effects of radiation on concrete properties and to develop a system for evaluating the integrity of concrete affected by radiation (Maruyama et al 2012).…”

Section: Japanese Conditions Issues and Concernsmentioning

confidence: 99%

“…In PLM and the inspection for extending the operation period, the integrity of concrete affected by radiation is evaluated with reference levels taken from data reported in Hilsdorf et al (1978) and interpreted by Kontani et al (2010): 1 × 10 20 n/cm 2 for fast neutrons and 2 × 10 5 kGy for gamma rays. However, in a national project organized by the Japan Nuclear Energy Safety Organization (partly a former organization in the NRA), the Hilsdorf compiled data were found to be unsuitable for this purpose because they did not cover the type of concrete used in LWRs (Kontani et al 2010).…”

Section: Japanese Conditions Issues and Concernsmentioning

confidence: 99%

“…Moreover, in 2010, Kontani et al (2010) recognized that reference levels based on data reported in Hilsdorf et al (1978) and used to establish reference 1 Oak Ridge National Laboratory, Oak Ridge, USA. *Corresponding author, E-mail: rosseeltm@ornl.gov & lepapeym@ornl.gov levels for concrete integrity might not be suitable because data were not representative of concrete mixtures, temperatures, and radiation fields typically seen in LWRs.…”

Section: Introductionmentioning

confidence: 99%

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Review of the Current State of Knowledge on the Effects of Radiation on Concrete

Rosseel

Maruyama

Pape

et al. 2016

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A review of the current state of knowledge on the effects of radiation on concrete in nuclear power production applications is presented. Emphasis is placed on the effects of radiation damage, as reflected by changes in engineering properties of concrete, in the evaluation of the long-term operation and for plant life or aging management of nuclear power plants (NPPs) in Japan, Spain, and the United States. National issues and concerns are described for Japan and the United States followed by a discussion of the fundamental understanding of the effects of radiation on concrete. Specifically, the effects of temperature, moisture content, and irradiation on ordinary Portland cement paste and the role of temperature and neutron energy spectra on radiation-induced volumetric expansion (RIVE) of aggregate-forming minerals are described. This is followed by a discussion of the bounding conditions for extended operation; the significance of accelerated irradiation conditions; the role of temperature and creep; and how these issues are being incorporated into numerical and meso-scale models. From these insights on radiation damage, analyses of these effects on concrete structures are reviewed, and the current status of work in Japan and the United States is described. Also discussed is the recent formation of a new international scientific and technical organization, the International Committee on Irradiated Concrete, to provide a forum for timely information exchanges among organizations pursuing the identification, quantification, and modeling of the effects of radiation on concrete in commercial nuclear applications. The paper concludes with a discussion of research gaps, including (1) interpreting test-reactor data, (2) evaluating service-irradiated concrete for aging management and to inform radiation damage models with the Zorita NPP (Spain) serving as the first comprehensive test case, (3) irradiated-assisted alkali-silica reactions, and (4) RIVE under constrained conditions.

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Current Concerns on Durability of Concrete Used in Nuclear Power Plants and Radioactive Waste Repositories

Phung

Maes

Jacques

2017

Lecture Notes in Civil Engineering

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Irradiation Effects on Concrete Structures

Cited by 33 publications

References 1 publication

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

A Numerical Model for Concrete Strength Change under Neutron and Gamma-ray Irradiation

Review of the Current State of Knowledge on the Effects of Radiation on Concrete

Current Concerns on Durability of Concrete Used in Nuclear Power Plants and Radioactive Waste Repositories

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