Measurement of nuclear fuel assembly's bow from visual inspection's video record

Plašienka Dušan; Knotek Jaroslav; Kopeć Marcin; Malá Martina; Blažek Jan

doi:10.1016/j.net.2022.12.033

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자료유형: 학술저널

저자정보: Plašienka Dušan (Profinit) Knotek Jaroslav (Institute of Information Theory and Automation of the CAS) Kopeć Marcin (Research Centre Řež) Malá Martina (Research Centre Řež) Blažek Jan (Institute of Information Theory and Automation of the CAS)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제4호

발행연도: 2023.4

수록면: 1,485 - 1,494 (10page)

DOI: 10.1016/j.net.2022.12.033

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The bow of the nuclear fuel assembly is a well-known phenomenon. One of the vital criteria during the history of nuclear fuel development has been fuel assembly’s mechanical stability. Once present, the fuel assembly bow can lead to safety issues like excessive water gap and power redistribution or even incomplete rod insertion (IRI). The extensive bow can result in assembly handling and loading problems. This is why the fuel assembly’s bow is one of the most often controlled geometrical factors during periodic fuel inspections for VVER when compared e.g. to on-site fuel rod gap measurements or other instrumental measurements performed on-site. Our proposed screening method uses existing video records for fuel inspection. We establish video frames normalization and aggregation for the purposes of bow measurement. The whole process is done by digital image processing algorithms which analyze rotations of video frames, extract angles whose source is the fuel set torsion, and reconstruct torsion schema. This approach provides results comparable to the commonly utilized method. We tested this new approach in real operation on 19 fuel assemblies with different campaign numbers and designs, where the average deviation from other methods was less than 2 % on average. Due to the fact, that the method has not yet been validated during full scale measurements of the fuel inspection, the preliminary results stand for that we recommend this method as a complementary part of standard bow measurement procedures to increase measurement robustness, lower time consumption and preserve or increase accuracy. After completed validation it is expected that the proposed method allows standalone fuel assembly bow measurements.

#Fuel assembly #Assembly quality #Assembly bow #Image processing

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