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Research Papers

Analysis Method for Impact and Dispersion Behavior of Water-Filled Tank

[+] Author and Article Information
Hidekazu Takazawa

Research and Development Group,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi 319-1292, Ibaraki, Japan
e-mail: Hidekazu.takazawa.te@hitachi.com

Kazuma Hirosaka

Research and Development Group,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi, Ibaraki, 319-1292, Japan
e-mail: kazuma.hirosaka.zp@hitachi.com

Katsumasa Miyazaki

Research and Development Group,
Hitachi, Ltd.,
7-1-1, Omika,
Hitachi 319-1292, Ibaraki, Japan
e-mail: katsumasa.miyazaki.xs@hitachi.com

Norihide Tohyama

Hitachi Works,
Hitachi-GE Nuclear Energy, Ltd.,
3-1-1, Saiwai,
Hitachi 317-0073, Ibaraki, Japan
e-mail: norihide.tohyama.tp@hitachi.com

Naomi Matsumoto

Hitachi Works,
Hitachi-GE Nuclear Energy, Ltd.,
3-1-1, Saiwai,
Hitachi 317-0073, Ibaraki, Japan
e-mail: naomi.matsumoto.sv@hitachi.com

Manuscript received October 30, 2017; final manuscript received May 16, 2018; published online September 10, 2018. Assoc. Editor: Xu Cheng.

ASME J of Nuclear Rad Sci 4(4), 041004 (Sep 10, 2018) (7 pages) Paper No: NERS-17-1246; doi: 10.1115/1.4040432 History: Received October 30, 2017; Revised May 16, 2018

A new Japanese nuclear regulation involves estimating the possible damage to plant structures due to intentional aircraft impact. The effect of aircraft impact needs to be considered in the existing nuclear power plants. The structural damage and fuel dispersion behavior after aircraft impact into plant structures can be evaluated using finite element analysis (FEA). FEA needs validated experimental data to determine the reliability of the results. In this study, an analysis method was validated using a simple model such as a cylindrical tank. Numerical simulations were conducted to evaluate the impact and dispersion behavior of a water-filled cylindrical tank. The simulated results were compared with the test results of the VTT Technical Research Centre of Finland (VTT). The simulations were carried out using a multipurpose FEA code LS-DYNA®. The cylindrical tank was modeled using a shell element, and the tank water was modeled using smoothed particle hydrodynamics (SPH) elements. First, two analysis models were used to evaluate the effect of the number of SPH elements. One had about 300,000 SPH elements and the other had 37,000 SPH elements. The cylindrical tank ruptured in the longitudinal direction after crashing into a rigid wall, and the filled water dispersed. There were few differences in the simulated results when using different numbers of SPH elements. The VTT impact test was simulated with an arbitrary Lagrangian-Eulerian (ALE) element to consider the air drag. The analytical dispersion pattern and history of dispersion velocity ratio agreed well with the impact test results.

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Figures

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Fig. 1

Schematic of water-filled tank (unit: mm) [9]

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Fig. 2

FE mesh division of analytical model (unit: mm)

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Fig. 3

Relation between stress and plastic strain

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Fig. 4

Schematics of analysis object for water-filled tank: (a) case 1 and case 2 and (b) case 3 (unit: mm)

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Fig. 5

Analysis results of dispersion behavior of water-filled tank (case 1)

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Fig. 6

Contour plot of dispersion velocity comparing cases 1 and 2: (a) 1.0 ms after impact and (b) 3.0 ms after impact

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Fig. 7

Frequency distribution of dispersion velocity of SPH elements: (a) 3.0 ms after impact and (b) 7.9 ms after impact

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Fig. 8

Contour plot of internal pressure distribution comparing pressure at 0.1 ms: (a) case 1 and (b) case 2

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Fig. 9

Dispersion behavior at 1.2 ms with and without air drag effect

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Fig. 10

History of dispersion velocity ratio comparing cases 2 and 3

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Fig. 11

Filled water dispersion pattern around cylindrical tank: (a) observed dispersion pattern [7] and (b) simulated dispersion pattern

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Fig. 12

Filled water dispersion area: (a) observed dispersion area [7] and (b) simulated dispersion area 3900ms after impact

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Fig. 13

History of dispersion velocity ratio of filled water

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