Out-of-Reactor Study on External-Pressure Creep of Zircaloy-2 Fuel Cladding Tubes
| Autor: | Hideo Maki, Teruo Hara |
|---|---|
| Rok vydání: | 1975 |
| Předmět: | |
| Zdroj: | Journal of Nuclear Science and Technology. 12:43-52 |
| ISSN: | 1881-1248 0022-3131 |
| Popis: | An out-of-reactor experiment was conducted for the purpose of studying the external- pressure creep behavior of zircaloy-2 fuel cladding tubes. The hour-glass shape of UO2 pellets acquired by thermal distortion was simulated by flanges machined out at both ends of stainless steel pellets 21 mm long. The mock-up specimens thus formed were pressurized externally in a furnace, and the changes brought upon the tube diameter were measured at intervals. The external-pressure creep deformation was observed to proceed in three steps- diametral decrease, elliptical deformation and final collapse. In the case of hollow tubes tested devoid of the pellets, elliptical deformation was observed, which accelerated with time until abrupt final collapse. Elliptical deformation was not observed on the pellet-filled tubes. Empirical equations were derived from the experimental results as functions of time, of hoop stress and of temperature, to express the external-pressure creep strain behavior of the stress-relieved tube, p... |
| Databáze: | OpenAIRE |
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