134.HLW地層処分場における熱輸送

抄録

This report expresses the numerical results of heat transfer phenomena around a high-level radioactive waste repository. The purposes are the mutual influence of ground water flow and heat transfer, and the influence of latent heat for vaporization on the temperature distribution. The 2-dimensional F.E.M. code 'CONVEC' is used for the investigation of the mutual influence of flow and heat, axisymmetric F.E.M. code 'HEAT' is used for the influence of latent heat. The mutual influence is discussed in near and far field. The results of analysis in the near field indicate that heat conduction through rock media is greater than heat transport by water flow. Thus, it is inferred that temperature distribution can be obtained by heat conduction analysis based on Fourier's law. In the far field, the results of analysis indicate that convection flow by radio-genic heat is significant in the case of major fractured rock. Finally, latent heat affects the temperature distribution slightly and desirably. Therefore, the influence of latent heat can be ignored.