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Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects

Combining global experience, comprehensive aging knowledge, and predictive methodologies provides ideal prerequisites for the long-term operation strategy (LTO) of a nuclear power plant (NPP). Applying management strategies with an understanding of the ways in which structures relevant for the plant...

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Autores principales: Cancemi, Salvatore Angelo, Lo Frano, Rosa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038101/
https://www.ncbi.nlm.nih.gov/pubmed/33808376
http://dx.doi.org/10.3390/ma14071703
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author Cancemi, Salvatore Angelo
Lo Frano, Rosa
author_facet Cancemi, Salvatore Angelo
Lo Frano, Rosa
author_sort Cancemi, Salvatore Angelo
collection PubMed
description Combining global experience, comprehensive aging knowledge, and predictive methodologies provides ideal prerequisites for the long-term operation strategy (LTO) of a nuclear power plant (NPP). Applying management strategies with an understanding of the ways in which structures relevant for the plant safety perform and interact in their operating environments is of meaningful importance for operating the plant beyond its originally licensed service life. In performing aging studies on the nuclear systems, structure, and components (SSCs), the results are crucial for demonstrating the safety and reliability of the NPP beyond 30 years of nominal operation. In this study, the synergistic effect of a creep mechanism with the alteration suffered by piping material is analyzed by means of MSC©MARC finite element code. Nonlinear analyses were performed to calculate the effects of the long operational period on a primary pipe, assess its degradation, and determine its residual functionality. In these analyses, both homogeneous and inhomogeneous pipe wall thinning are considered, as well as the operating or expected thermal–mechanical loads. The obtained results indicate that thermo–mechanical loads are responsible for pipe deformation, which develops and increases as the transient progresses. Furthermore, an excessive (general or local) wall thinning may determine a dimensional change of the pipe, even causing bending or buckling.
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spelling pubmed-80381012021-04-12 Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects Cancemi, Salvatore Angelo Lo Frano, Rosa Materials (Basel) Article Combining global experience, comprehensive aging knowledge, and predictive methodologies provides ideal prerequisites for the long-term operation strategy (LTO) of a nuclear power plant (NPP). Applying management strategies with an understanding of the ways in which structures relevant for the plant safety perform and interact in their operating environments is of meaningful importance for operating the plant beyond its originally licensed service life. In performing aging studies on the nuclear systems, structure, and components (SSCs), the results are crucial for demonstrating the safety and reliability of the NPP beyond 30 years of nominal operation. In this study, the synergistic effect of a creep mechanism with the alteration suffered by piping material is analyzed by means of MSC©MARC finite element code. Nonlinear analyses were performed to calculate the effects of the long operational period on a primary pipe, assess its degradation, and determine its residual functionality. In these analyses, both homogeneous and inhomogeneous pipe wall thinning are considered, as well as the operating or expected thermal–mechanical loads. The obtained results indicate that thermo–mechanical loads are responsible for pipe deformation, which develops and increases as the transient progresses. Furthermore, an excessive (general or local) wall thinning may determine a dimensional change of the pipe, even causing bending or buckling. MDPI 2021-03-30 /pmc/articles/PMC8038101/ /pubmed/33808376 http://dx.doi.org/10.3390/ma14071703 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cancemi, Salvatore Angelo
Lo Frano, Rosa
Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title_full Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title_fullStr Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title_full_unstemmed Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title_short Preliminary Analysis of Long-Term Performance of a Piping: Aging and Creep Effects
title_sort preliminary analysis of long-term performance of a piping: aging and creep effects
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038101/
https://www.ncbi.nlm.nih.gov/pubmed/33808376
http://dx.doi.org/10.3390/ma14071703
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