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research-article

GUIDED WAVES AS AN ONLINE MONITORING TECHNOLOGY FOR LONG TERM OPERATION IN NUCLEAR POWER PLANTS: EXPERIMENTAL RESULTS ON A STEAM DISCHARGE PIPE

[+] Author and Article Information
Mauro Cappelli

ENEA FSN-FUSPHY-SCM - Frascati Research Center, via E. Fermi, 45 - 00044 Frascati - Italy
mauro.cappelli@enea.it

Francesco Cordella

ENEA FSN-FUSPHY-SAD - Frascati Research Center, via E. Fermi, 45 - 00044 Frascati - Italy
francesco.cordella@enea.it

Francesco Bertoncini

DESTEC - University of Pisa, l.go Lucio Lazzarino - 56122 Pisa - Italy
francesco.bertoncini@gmail.com

Marco Raugi

DESTEC - University of Pisa, l.go Lucio Lazzarino - 56122 Pisa - Italy
marco.raugi@dsea.unipi.it

1Corresponding author.

ASME doi:10.1115/1.4041193 History: Received October 30, 2017; Revised August 10, 2018

Abstract

Guided Wave (GW) testing is regularly used for finding defect locations through long range screening using low-frequency waves (from 5 to 250 kHz). By using magnetostrictive sensors some issues, which usually limit the application to Nuclear Power Plants (NPP), can be fixed. The authors have already shown the basic theoretical background and simulation results concerning a real steel pipe, used for steam discharge, with a complex structure. On the basis of such theoretical framework, a new campaign has been designed and developed on the same pipe, and the obtained experimental results are now here presented as a useful benchmark for the application of GWs as Non Destructive Techniques (NDT). Experimental measures using a symmetrical probe and a local probe in different configurations (pulse-echo and pitch-catch) indicate that GW testing with magnetostrictive sensors can be reliably applied to long-term monitoring of NPP components.

Copyright (c) 2018 by ASME
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