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Title: Radiation-Induced Degradation of Concrete in NPPs

Abstract

Nuclear power plants life extensions to 60 and potentially 80 years of operation have renewed interest in long-term material degradation. One material being considered is concrete. Swelling of aggregates driven by radiation induced displacements of atoms is currently considered to be the most probable leading contributor to the radiation induced degradation of concrete mechanical properties. In the biological shields of nuclear plants atom displacements are dominated by neutron contributions while gamma-ray contributions are negligible. For a number of minerals, which are common constituents of aggregates, in concrete it was shown that ~95% of the dpa is generated by neutrons with energies above 0.1 MeV. Neutrons with energies above 1 MeV contribute only ~20 to 25% to the dpa. Therefore, if neutron fluence is used as correlation parameter for the concrete degradation, the neutron fluence energy cut-off of 0.1 MeV should be used. Based on the projected neutron fluence values (E > 0.1 MeV) in the concrete biological shields of the US pressurized water reactor fleet and the available data on radiation effects on concrete, some decrease in mechanical properties of concrete cannot be ruled out during extended operation beyond 60 years.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1486970
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: ASTM 16th International Symposium on Reactor Dosimetry (ISRD-16) - Sante Fe, New Mexico, United States of America - 5/7/2017 8:00:00 AM-5/12/2017 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Remec, Igor, Rosseel, T. M., Field, Kevin G., and Le Pape, Yann. Radiation-Induced Degradation of Concrete in NPPs. United States: N. p., 2018. Web. doi:10.1520/STP160820170059.
Remec, Igor, Rosseel, T. M., Field, Kevin G., & Le Pape, Yann. Radiation-Induced Degradation of Concrete in NPPs. United States. doi:10.1520/STP160820170059.
Remec, Igor, Rosseel, T. M., Field, Kevin G., and Le Pape, Yann. Thu . "Radiation-Induced Degradation of Concrete in NPPs". United States. doi:10.1520/STP160820170059. https://www.osti.gov/servlets/purl/1486970.
@article{osti_1486970,
title = {Radiation-Induced Degradation of Concrete in NPPs},
author = {Remec, Igor and Rosseel, T. M. and Field, Kevin G. and Le Pape, Yann},
abstractNote = {Nuclear power plants life extensions to 60 and potentially 80 years of operation have renewed interest in long-term material degradation. One material being considered is concrete. Swelling of aggregates driven by radiation induced displacements of atoms is currently considered to be the most probable leading contributor to the radiation induced degradation of concrete mechanical properties. In the biological shields of nuclear plants atom displacements are dominated by neutron contributions while gamma-ray contributions are negligible. For a number of minerals, which are common constituents of aggregates, in concrete it was shown that ~95% of the dpa is generated by neutrons with energies above 0.1 MeV. Neutrons with energies above 1 MeV contribute only ~20 to 25% to the dpa. Therefore, if neutron fluence is used as correlation parameter for the concrete degradation, the neutron fluence energy cut-off of 0.1 MeV should be used. Based on the projected neutron fluence values (E > 0.1 MeV) in the concrete biological shields of the US pressurized water reactor fleet and the available data on radiation effects on concrete, some decrease in mechanical properties of concrete cannot be ruled out during extended operation beyond 60 years.},
doi = {10.1520/STP160820170059},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

Conference:
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