X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C
Two types of dedicated Tristructural isotropic (TRISO) nuclear fuel particles, PyC-1 (Kernel/Buffer/PyC) and PyC-2 (Kernel/Buffer/SiC/PyC) from PYCASSO (Pyrocarbon irradiation for creep and swelling/shrinkage of objects) neutron irradiation experiments, were studied. For unirradiated particles, crus...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-02-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519308202 |
| _version_ | 1819136274805555200 |
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| author | Dong Liu Steven Knol Jon Ell Harold Barnard Mark Davies Jan A. Vreeling Robert O. Ritchie |
| author_facet | Dong Liu Steven Knol Jon Ell Harold Barnard Mark Davies Jan A. Vreeling Robert O. Ritchie |
| author_sort | Dong Liu |
| collection | DOAJ |
| description | Two types of dedicated Tristructural isotropic (TRISO) nuclear fuel particles, PyC-1 (Kernel/Buffer/PyC) and PyC-2 (Kernel/Buffer/SiC/PyC) from PYCASSO (Pyrocarbon irradiation for creep and swelling/shrinkage of objects) neutron irradiation experiments, were studied. For unirradiated particles, crushing experiments using a unique hot cell, combined with in situ X-ray computed micro-tomography (XCT) imaging, were conducted at room temperature (RT) and at 1000 °C. Although the SiC layer on the particles is presumed to provide ‘mechanical stability’ to the TRISO particles, results showed a remarkable reduction (~45%) in the crushing strength of the PyC-2 particles at 1000 °C compared to RT. The fracture patterns of the two types of particles, both at the contact zone and on subsequent propagation, differ significantly at RT and 1000 °C. Further, irradiated particles (irradiation temperature: 1000 ± 20 °C; irradiation doses: 1.08–1.23 dpa and 1.49–1.51 dpa) were imaged by XCT; 250 PyC-1 particles and 223 PyC-2 particles were studied in total and the change in radius/layer thickness in each type was examined. It was found that the buffer densification was lower in PyC-1 particles compared to PyC-2 particles, and the PyC layer shrank in the PyC-I particles, whereas it expanded in PyC-2. Results are discussed in terms of how the residual stresses can impact the high-temperature and post-irradiation behavior of these particles. Keywords: TRISO, PYCASSO, High-temperature X-ray computed micro-tomography, Irradiation induced dimensional change, Uniaxial compression, Contact crushing |
| first_indexed | 2024-12-22T10:32:23Z |
| format | Article |
| id | doaj.art-53b0f6ac92514dfb9437eed3a8e66549 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-22T10:32:23Z |
| publishDate | 2020-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-53b0f6ac92514dfb9437eed3a8e665492022-12-21T18:29:17ZengElsevierMaterials & Design0264-12752020-02-01187X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °CDong Liu0Steven Knol1Jon Ell2Harold Barnard3Mark Davies4Jan A. Vreeling5Robert O. Ritchie6School of Physics, University of Bristol, UK; Corresponding author.NRG, Petten, the NetherlandsMaterials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USAAdvanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, USAUSNC, Seattle, USANRG, Petten, the NetherlandsDepartment of Materials Science & Engineering, University of California, Berkeley, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USATwo types of dedicated Tristructural isotropic (TRISO) nuclear fuel particles, PyC-1 (Kernel/Buffer/PyC) and PyC-2 (Kernel/Buffer/SiC/PyC) from PYCASSO (Pyrocarbon irradiation for creep and swelling/shrinkage of objects) neutron irradiation experiments, were studied. For unirradiated particles, crushing experiments using a unique hot cell, combined with in situ X-ray computed micro-tomography (XCT) imaging, were conducted at room temperature (RT) and at 1000 °C. Although the SiC layer on the particles is presumed to provide ‘mechanical stability’ to the TRISO particles, results showed a remarkable reduction (~45%) in the crushing strength of the PyC-2 particles at 1000 °C compared to RT. The fracture patterns of the two types of particles, both at the contact zone and on subsequent propagation, differ significantly at RT and 1000 °C. Further, irradiated particles (irradiation temperature: 1000 ± 20 °C; irradiation doses: 1.08–1.23 dpa and 1.49–1.51 dpa) were imaged by XCT; 250 PyC-1 particles and 223 PyC-2 particles were studied in total and the change in radius/layer thickness in each type was examined. It was found that the buffer densification was lower in PyC-1 particles compared to PyC-2 particles, and the PyC layer shrank in the PyC-I particles, whereas it expanded in PyC-2. Results are discussed in terms of how the residual stresses can impact the high-temperature and post-irradiation behavior of these particles. Keywords: TRISO, PYCASSO, High-temperature X-ray computed micro-tomography, Irradiation induced dimensional change, Uniaxial compression, Contact crushinghttp://www.sciencedirect.com/science/article/pii/S0264127519308202 |
| spellingShingle | Dong Liu Steven Knol Jon Ell Harold Barnard Mark Davies Jan A. Vreeling Robert O. Ritchie X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C Materials & Design |
| title | X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C |
| title_full | X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C |
| title_fullStr | X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C |
| title_full_unstemmed | X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C |
| title_short | X-ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °C |
| title_sort | x ray tomography study on the crushing strength and irradiation behaviour of dedicated tristructural isotropic nuclear fuel particles at 1000 °c |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519308202 |
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