Browse > Article
http://dx.doi.org/10.20466/KPVP.2018.14.1.038

Development of FEA-based Metal Sphere Signal Map for Nuclear Power Plant Structure  

Moon, Seongin (한국원자력연구원)
Kang, To (한국원자력연구원)
Han, Soonwoo (한국원자력연구원)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.14, no.1, 2018 , pp. 38-47 More about this Journal
Abstract
For safe operation of nuclear power plants, a loose-part monitoring system (LPMS) is used to detect and locate loose-parts within the reactor coolant system, and to estimate their mass and damage potential. There are several methods to estimate mass, such as the center frequency method based on the Hertz's impact theory, a frequency ratio method and so on, but it is known that these methods cannot provide accurate information on impact response for identifying the impact source. Thanks to increasing computing power, finite element analysis (FEA) method recently become an available option to calculate reliably impact response behavior. In this paper, a finite element analysis model to simulate the propagation behavior of the bending wave, generated by a metal ball impact, is validated by performing a series of impact tests and the corresponding finite element analyses for flat plate and shell structures. Also, a FEA-based metal sphere signal map is developed, and then blind tests are performed to verify the map. This study provides an accurate simulation method for predicting the metal impact behavior and for building a metal sphere signal map, which can be used to estimate the mass of loose-parts on site in nuclear power plants.
Keywords
Loose Part; Bending Wave; Mass Estimation; Metal Sphere Signal Map;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Rhodes, W.D., et al, 2012, Export Control Guide: Loose Parts Monitoring Systems for Nuclear Power Plants, Oak Ridge National Laboratory, ORNL/TM-2012/601.
2 Mayo, C.W., et al, 1988, Loose-Parts Monitoring System Improvements, Electric Power Research Institute, EPRI NP-5743.
3 Park, J.H., 2006, An Impact Source Localization using Wigner-Ville Distribution on Nuclear Power Plant Pressure Boundary Structures, Korea Advanced Institute of Science and Technology, Ph. D. Thesis.
4 Shin, S.H., 2011, "Mass Estimation of Impacting Objects against a Structure Using an Artificial Neural Network without Consideration of Background Noise," Nuclear Engineering and Technology, Vol. 43, No. 4, pp. 343-354.   DOI
5 Kim, J.S., et al., 2002, "Development of automatic algorithm for localizing loose parts with a steam generator," Nuclear Engineering and Design, Vol. 219, pp. 269-276.
6 Olma, B.J., 1985, "Source Location and Mass Estimation in Loose Parts Monitoring of LWR's," Progress in Nuclear Energy, Vol. 15, pp. 583-594.   DOI
7 Ziola, S.M., 1991, "Source location in thin plates using cross-correlation," Progress in Nuclear Energy, Naval Postgraduate School, Ph. Dl. Thesis.
8 Mayo, C.W., 1999, "Loose-Part Mass and Energy Estimation," Progress in Nuclear Energy, Vol. 34, No. 3, pp. 263-282.   DOI
9 Tsunoda, T., et al., 1985, "Studies on the Loose Part Evaluation Technique," Progress in Nuclear Energy, Vol. 15, pp. 569-579   DOI
10 Lee, S.I., et al., 2016, "Steel Ball Impact-mass Index Construction for the Reactor Scale Models," Annual Spring Conference of the Korean Society for Noise and Vibration Engineering, p. 108.
11 Rose, J.L., 1999, Ultrasonic Waves in Solid Media, Cambridge University Press.
12 Cremer, L., et al., 1973, Structure-Borne Sound, Springer
13 Lee, J.H., et al., 2016, "Comparison of the Wave Propagation Group Velocity in Plate and Shell," Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 26, No. 4, pp. 483-491   DOI
14 Ross, D., 1987, Mechanics of Underwater Noise, Peninsula Publishing.
15 Park, J.H., et al., 2006, "An Impact Source Localization on a Spherical Shell by Using Smoothed Wigner-Ville Distributions," Key Engineering Materials, Vols. 321-323, pp. 1274-1279.   DOI
16 Drozdz, M.B., 2008, Efficient Finite Element Modeling of Ultrasound Waves in Elastic Media, Imperial College of Science Technology and Medicine, Ph. D. Thesis.
17 Juluri, N., 2008, Inspection of Complex Structures Using Guide Waves, Imperial College of Science Technology and Medicine, Ph. D. Thesis.
18 Park, J.H., et al., 2006, "An Impact Source Localization on an Elastic Plate in Noisy Environment," Measurement and Science and Technology, Vol. 17, pp. 2757-2766.   DOI