Characterization of local hydride re-orientation in high burn-up PWR fuel rods induced by high pressure at high temperatures
| Autor: | Z. Burns, Yanfa Yan, T. S. Smith, B. Bevard |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydride Mechanical Engineering Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Rod 010305 fluids & plasmas Cooling rate Mechanics of Materials High pressure 0103 physical sciences Cylinder stress General Materials Science Irradiation Hydrogen concentration Composite material 0210 nano-technology Ductility |
| Zdroj: | MRS Advances. 2:591-596 |
| ISSN: | 2059-8521 |
| Popis: | Hydride re-orientation in high burn-up PWR fuel rods was induced by high pressure at high temperatures. The high-burnup specimens were sectioned from PWR rods taken from a 15 × 15 assembly of the H.B. Robinson (HBR) Unit 2 reactor. Out-of cell benchmark tests performed on unirradiated hydrided Zircaloy-4 specimens were conducted to determine the appropriate temperature, pressure, cooling rate, and number of cooling cycles for the reorientation of the irradiated in-cell specimens. The in-cell hydride reorientation tests were performed using high-burnup fuel specimens under a hoop stress ≈ 145 MPa at 400°C. The specimens were heated to the target temperature of 400°C, held for 3 hours, cooled at l°C/min to 170°C,and then heated at l°C/min to the target temperature again for five cycles. Post test metallographic examinations showed that a significant amount of radial hydrides were induced in the HBR fuel rods. The length of radial hydride was up to 60 μm. For unirradiated materials, the ductility of the radial hydride treated specimens is significantly reduced as compared to the as-hydrided specimens having the same hydrogen concentration (≈300 wppm in this work). The mechanical testing on irradiated fueled samples with hydride reorientation experiments have been performed, and will be reported separately in the near future. |
| Databáze: | OpenAIRE |
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