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Investigation of Conjugate Heat Transfer in Interim Storage of High Level Radioactive Waste


 Solidified high level radioactive wastes generate decay heat that must be taken into account during interim storage in engineered facilities prior to geological disposal. The continual heat generation within the canisters necessitates reliable heat removal to avoid overheating of the stored material and the surrounding safety barriers. This paper is concerned with the modelling and computation of heat transfer in one of the storage cells, based on the conceptual design study for natural convection cooled high level radioactive waste storage. All internal features of the storage cell have been explicitly modelled to analyse the internal heat transfer process by conduction and natural convection coupled with thermal radiation. One of the major objectives of the current study was to assess the contribution of radiation heat transfer in altering temperature profiles in the storage cell. Furthermore the model has been used to predict the effects of surface radiative properties, canister filling material conductivities and waste loading on the temperature and velocity fields. A variation in the enclosed air gap width and also cooling air channel width has also been performed to see their potential effect on temperature profiles of the storage cell.