摘要(英) |
Spent nuclear fuel is high temperature as well as highly radioactive and requires remote handling and shielding. The international consensus is that deep geological repository in a stable host rock deep underground is the most reliable method.
In order to ensure the safety of repository, prior analysis is extremely critical. The high temperature generated by the decay heat may deteriorate the material inside the disposal hole, resulting in the material not being able to isolate radionuclides. In addition, when the buffer is fully saturated, Spent Nuclear Fuel in contact with the groundwater causes radionuclides to be released from the canister. This study mainly discusses the time of resaturation and peak temperature of the repository. Each analysis is modelled by the finite element software ABAQUS.
First, the existence of fractures in the repository, causing groundwater to flow rapidly through the cracks, accelerating the time of resaturation. In this study, rock fracture has been modelled with different cases. All cases refer to Swedish Nuclear Fuel and Waste Management Company (SKB). Results of temperature and resaturation time have been compared with SKB.
Secondly, in the in-situ experiment, artificial heater and filters were used to simulate the effects of spent nuclear fuel and groundwater. The experiment has been modelled temperature and saturation history by SKB. In this study, the model has established the same conditions as SKB for parallel verification.
Finally, near field of the repository has been modelled by different research teams in the BMT1B of DECOVALEX III project. In this study, results of this study will be compared with the temperature and the time of resaturation of each team.
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