Changes in Concrete Subjected to Neutron Irradiation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F23%3AN0000081" target="_blank" >RIV/26722445:_____/23:N0000081 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/chapter/10.1007/978-3-031-44603-0_9" target="_blank" >https://link.springer.com/chapter/10.1007/978-3-031-44603-0_9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-031-44603-0_9" target="_blank" >10.1007/978-3-031-44603-0_9</a>

Result language

angličtina

Original language name

Changes in Concrete Subjected to Neutron Irradiation

Original language description

Nuclear energy has several difficulties connected to the production or storage of the radioactive waste. Long-term operation is a process that may prolong the serviceability of the power plant by 10, 20 or more years. Nevertheless, crucial components as the reactor pressure vessel or its surrounding must be proved before enabling this process. Fast-neutron radiation can have several effects on the concrete biological shield around a nuclear reactor. It can cause changes in the lattice structure of some rock forming minerals, resulting in an increase in volume of several percent and this may lead to cracks between the hardened cement paste and the coarse aggregate grain. Fast neutron radiation is converted in concrete to thermal neutrons which generate secondary gamma radiation and heat whereas gamma generates heat as well. Heat followed by drying causes additional shrinkage of the hardened cement paste. All these affects can be observed via digital images processing after the images have been subjected to segmentation, preprocessing, registration and normalization of the illumination. Twelve small holes were drilled in the concrete slab 50 × 50 × 5 cm and the resulting cores of a diameter 4 cm were removed. They were cleaned and polished then inserted into the LVR-15 Research Nuclear Reactor for one year of irradiation with exposure to a flux of 6 ÷ 7e11 neutrons·cm-2.s-1. The samples were measured and photographed using the Vertex measuring system before and after irradiation and they were examined to find evidence of any visual changes. The work on digital image processing began in April 2023 and the first outcomes should be available at the end of the year 2023.

Czech name

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Czech description

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Type

C - Chapter in a specialist book

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

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Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Book/collection name

Modern Building Materials, Structures and Techniques

ISBN

978-3-031-44605-4

Number of pages of the result

10

Pages from-to

99-108

Number of pages of the book

677

Publisher name

Springer

Place of publication

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UT code for WoS chapter

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