Remote-filed based tomographic evaluation of two-phase flows aiming at a countermeasure against a loss of coolant accidents
| Project/Area Number |
15H04237
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
Yusa Noritaka 東北大学, 工学研究科, 准教授 (60466779)
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| Co-Investigator(Kenkyū-buntansha) |
江原 真司 東北大学, 工学研究科, 准教授 (30325485)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2015: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Keywords | システム設計・安全工学 / 事故対応・保全技術 / リモートセンシング / トモグラフィー / 断層撮影 / 電磁非破壊評価 / 事項対応・保全技術 |
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| Outline of Final Research Achievements |
This study attempted the application of remote field eddy current technique to the evaluation of two-phase flows from outside the pipe, especially for the purpose of confirming presence of coolants in the case of a loss of coolant accident. Detailed three-dimensional finite element simulations and experiments revealed, however, high frequency excitation necessary to distinguish water and air makes it difficult to realize remote field phenomena in case of pipes carrying the fluids are made from metals. Furthermore, even the pipes are made from composite materials whose electrical conductivity is much smaller than that of the metals, it was difficult to obtain tomographic images of the two-phase flows with a high spatial and time resolutions as originally expected.
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| Academic Significance and Societal Importance of the Research Achievements |
時間変動電磁場を用いた対象内部の電磁気的分布の断層撮影技術に関し、高導電性材料内部に低導電性材料が存在する場合について詳細な検討を行った結果、リモートフィールド現象を利用したとしても低導電性材料の詳細な評価を行うことは困難であることを確認した。これにより、冷却水喪失を伴い得るプラント事故においては電磁現象を利用して非侵襲的に配管内部の冷却水流動状態を確認することは現実的ではなく、他の手段による必要があることが明らかとなった。
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Report
(5 results)
Research Products
(3 results)
