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Research Papers

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,
Frascati 00044, Italy
e-mail: mauro.cappelli@enea.it

Francesco Cordella

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

Francesco Bertoncini

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

Marco Raugi

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

1Corresponding author.

Manuscript received October 30, 2017; final manuscript received August 10, 2018; published online January 24, 2019. Editor: Igor Pioro.

ASME J of Nuclear Rad Sci 5(1), 011016 (Jan 24, 2019) (7 pages) Paper No: NERS-17-1240; doi: 10.1115/1.4041193 History: Received October 30, 2017; Revised August 10, 2018

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 (NPPs), 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 nondestructive techniques. 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 NPPs components.

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References

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Kwun, H. , Kim, S. Y. , and Light, G. M. , 2011, “Magnetostrictive Sensor Technology for Long-Range Guided Wave Inspection and Monitoring of Pipe,” NDT Tech., 10(2), pp. 6–9.
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Bertoncini, F. , Cappelli, M. , Cordella, F. , and Raugi, M. , 2016, “Non-Invasive On-Line Monitoring for Nuclear Power Plants Using Guided Waves Propagating in Steel Pipes With Different Types of Structural Complexity,” ASME Paper No. ICONE24-60885.
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Figures

Grahic Jump Location
Fig. 1

Coil placed over the pipe

Grahic Jump Location
Fig. 2

Group velocity between 64 and 128 kHz of: (a) torsional modes T(0,1) and T(0,2), (b) longitudinal modes L(0,1), L(0,2), and L(0,3), (c) flexural modes F(1,i) with i = 1,…,5 for a 363.2 × 10−3 m internal diameter, 21.4 × 10−3 m thick steel pipe with no attenuation: cL = 5960 m/s, cT = 3260 m/s, and ρ = 8000 kg/m3

Grahic Jump Location
Fig. 3

Strip and coil placed over the pipe

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Fig. 4

Detail of the complex pipe structure used as a test

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Fig. 5

Sixteen inches schedule 80 steam discharge pipe. The positions of the magnetostrictive transducers are identified with PM1 and PM2. Capital letters are used to identify the elements in the positive direction (small letters are used for negative direction).

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Fig. 6

PM1 experimental results for a frequency of 64 kHz. With reference to Table 1, capital letters are used to identify the elements in the positive direction (small letters are used for negative direction).

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Fig. 7

PM1: different frequencies reflections from I1 and W1

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Fig. 8

PM1: geometry of the measure with the local probe and distribution of sectors s1, … s12

Grahic Jump Location
Fig. 9

(a) PM1: measures with local probe applied along the sectors: 1–3 for a frequency of 64 kHz, (b) PM1: measures with local probe applied along the sectors: 4–6 for a frequency of64 kHz, (c) PM1: measures with local probe applied along the sectors: 7–9 for a frequency of 64 kHz, and (d) PM1: measures with local probe applied along the sectors: 10–12 for a frequency of 64 kHz

Grahic Jump Location
Fig. 10

PM2: experimental results for a frequency of 64 kHz. With reference to Table 2, capital letters are used to identify the elements in the positive direction (small letters are used for negative direction).

Grahic Jump Location
Fig. 11

PM2: difference between 64 and 128 kHz (solid line: no gain, dashed: 10% coarse gain) on weld w1 response

Tables

Errata

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