Assessment of inservice conditions of safety-related nuclear plant structures

Ashar, H.; Bagchi, G.

doi:10.2172/96857

Cited by 10 publications

(4 citation statements)

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“…As NPP concrete structures age, concrete can degrade due to factors such as hydrogen stress cracking, (microbiological) corrosion, sustained temperature cycles and fatigue, high humidity, retention or spills of water or borated water, carbonation, chemical reactions such as alkali–silica reaction, machine vibrations, and irradiation. − These age-related degradations of structural materials have been increasingly reported . Although degradation of concrete structures due to environmental causes has been reported, deterioration caused by direct radiation has not been observed in decommissioned NPPs that have operated for less than 40 years.…”

Section: Introductionmentioning

confidence: 99%

Radiation-Induced Changes in Quartz, A Mineral Analog of Nuclear Power Plant Concrete Aggregates

2018

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Quartz single-crystal samples consisting of α-quartz crystal structure were neutron irradiated to fluences of 5 × 10, 4 × 10, and 2 × 10 n/cm (E > 0.1 MeV) at two temperatures (52 and 95 °C). The changes in the α-quartz phase as a function of these two conditions (temperature and fluence) were studied using X-ray powder diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM), and the results acquired using these complementary techniques are presented in a single place for the first time. XRD studies showed that the lattice parameters of α-quartz increased with increasing neutron flux. The lattice growth was larger for the samples that were neutron irradiated at 52 °C than at 95 °C. Moreover, an amorphous content was determined in the quartz samples neutron irradiated at 4 × 10 n/cm, with the greater amount being in the 52 °C irradiated sample. Complete amorphization of quartz was observed at a fluence of 2 × 10 n/cm (E > 0.1 MeV) using XRD and confirmed by TEM characterization and Raman spectroscopic studies. The cause for α-quartz lattice expansion and sample amorphization was also explored using XRD and Raman spectroscopic studies.

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Section: Introductionmentioning

confidence: 99%

Radiation-Induced Changes in Quartz, A Mineral Analog of Nuclear Power Plant Concrete Aggregates

2018

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“…Most structural degradations can be found in literature that involved results from special inspection efforts. For example, NUREG-1522 covers data obtained from walkdowns conducted at six older vintage plants [6].…”

Section: Results Assessmentmentioning

confidence: 99%

Identification and Assessment of Aging-Related Degradation Occurrences in Nuclear Power Plants

Choi¹,

Choun²,

Kim³

et al. 2012

Nuclear Engineering and Technology

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“…Initially, degradation of NPP concrete structures in the U.S. occurred early in their life and has been corrected [37][38][39]. Causes were primarily related either to improper material selection and construction/design deficiencies, or environmental effects.…”

Section: Operating Experiencementioning

confidence: 99%

“…Although continuing the service of a NPP past the initial operating license period is not expected to be limited by the concrete structures, several incidences of age-related degradation have been reported [39][40][41][42][43][44]. Examples of some of these problems include corrosion of steel reinforcement in water intake structures, corrosion of post-tensioning tendon wires, leaching of tendon gallery concrete, low prestressing forces, and leakage of corrosion inhibitors from tendon sheaths.…”

Section: Operating Experiencementioning

confidence: 99%

Overview of activities in the U.S. related to continued service of nuclear power plant concrete structures

Naus

2011

EPJ Web of Conferences

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Abstract. Safety-related nuclear power plant concrete structures are described and commentary on continued service assessments of these structures is provided. In-service inspection and testing requirements in the U.S. are summarized. The license renewal process in the U.S. is outlined and its current status noted. A summary of operating experience related to U.S. nuclear power plant concrete structures is presented. Several candidate areas are identified where additional research would be of benefit to aging management of NPP concrete structures. Finally current ORNL activities related to aging-management of concrete structures are outlined: development of operating experience database, application of structural reliability theory, and compilation of elevated temperature concrete material property data and information.

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Assessment of inservice conditions of safety-related nuclear plant structures

Cited by 10 publications

References 0 publications

Radiation-Induced Changes in Quartz, A Mineral Analog of Nuclear Power Plant Concrete Aggregates

Radiation-Induced Changes in Quartz, A Mineral Analog of Nuclear Power Plant Concrete Aggregates

Identification and Assessment of Aging-Related Degradation Occurrences in Nuclear Power Plants

Overview of activities in the U.S. related to continued service of nuclear power plant concrete structures

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