Storage and Solidification of MAW/LAW in Underground Cavities (Phase 2): Three-Dimensional Heat Transport Analysis

摘要

The effect of the three-dimensionality of heat transport on the one hand and the effect of the charging strategy on the temperature distribution in the cavern and in the ambient salt on the other hand were studied. The main objectives in this process were to determine the maximum product temperature and the surface temperatures in order to be able to make a statement concerning results obtained with respect to material transport in the cavern atmosphere due to the convection which develops. In addition, initial rough values were obtained for the order of magnitude of the maximum temperature gradients in the salt. The essential results can be summarized as follows: (1) surface temperature differences which develop and which can be regarded as one of the driving thermodynamic forces for the formation of the convection processes are so small that the convection processes will only be very slight; (2) maximum product temperature when the cavern is continuously filled is to be expected to be approximately 55 to 60 exp 0 C and thus lies significantly below the previously indicated values; (3) temperature distribution in the area of the uppermost product layers (recently stored) is independent of the stored volume above a certain boundary value; (4) for the temperature gradient from the salt in the immediate vicinity of the product, the order of magnitude is expected to be in time approximately 0.1 exp 0 C/hr. (ERA citation 06:031747)