PSI - Issue 23

Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect ScienceDirect

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 23 (2019) 227–232

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Pip line sy tem failures confirm th t spec al attention must be paid to the main components f nuclear p wer plants n particular. One of the significa t degradation factors in terms of integrity and residual life of these components is ero ion-corro ion in piping syst ms and cr ep in hi h pressure pipelines of thermal pow r plants. This articl deals with analysis of a set of steel samples with iffere t deg es of degrad tion using acou tic emis ion ethod based on detection of elastic-st ss waves in a m t rial. Time domain and frequency domain characteristics of oustic emission signals ge erated by diff rent creep mechanisms are analyzed. The main task s to find a relationship between crack reation and propagation and acoustic emission response. Part of t e solution is also the design and implementation of a diagnostic m thod for operation m itoring of the eteriora ion of the high- ressure piping systems a igh temperature. The benef t shou d b a significant reduction in h i k of damage to important components and reduction of the probability of damaging pipe wall integrity potentially sensitive to erosion-corrosion. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Acoustic Emission Response to Erosion-Corrosion and Creep Damage in Pipeline Systems Libor Nohal a , Pavel Mazal a , Frantisek Vlasic a *, Marie Svobodova b a Brno University of Technology, Faculty of Mechanical Engineering, Technicka 2, Brno, 616 69, Czech Republic b UJP Praha, a.s., Nad Kaminkou 1345, Prague, 156 10, Czech Republic 9th International Conference on Materials Structure and Micromechanics of Fracture Acoustic Emission Response to Erosion-Corrosion and Creep Damage in Pipeline Systems Libor Nohal a , Pavel Mazal a , Frantisek Vlasic a *, Marie Svobodova b a Brno University of Technology, Faculty of Mechanical Engineering, Technicka 2, Brno, 616 69, Czech Republic b UJP Praha, a.s., Nad Kaminkou 1345, Prague, 156 10, Czech Republic Abstract Abstract Pipeline system failures confirm that special attention must be paid to the main components of nuclear power plants in particular. One of the significant degradation factors in terms of integrity and residual life of these components is erosion-corrosion in piping systems and creep in high pressure pipelines of thermal power plants. This article deals with analysis of a set of steel samples with different degrees of degradation using acoustic emission method based on detection of elastic-stress waves in a material. Time domain and frequency domain characteristics of acoustic emission signals generated by different creep mechanisms are analyzed. The main task is to find a relationship between crack creation and propagation and acoustic emission response. Part of the solution is also the design and implementation of a diagnostic method for operation monitoring of the deterioration of the high-pressure piping systems at high temperature. The benefit should be a significant reduction in the risk of damage to important components and reduction of the probability of damaging pipe wall integrity potentially sensitive to erosion-corrosion.

Keywords: acoustic emission method; creep; crack; steam piping material Keywords: acoustic emission method; creep; crack; steam piping material

1. Introduction 1. Introduction

Secondary circuit failures in nuclear power plants confirm that there is a need to pay due attention to the main components of this part of the nuclear power plant. One of the major degradation factors in terms of integrity and Secondary circuit failures in nuclear power plants confirm that there is need to pay due attention to the main components of this part of the nuclear power plant. One of the major degradation factors in terms of integrity and

* Corresponding author. Tel.: +420-541-143-240 . E-mail address: vlasic@fme.vutbr.cz * Corresponding author. Tel.: +420-541-143-240 . E-mail address: vlasic@fme.vutbr.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.091