Abstract
The primary cover gas space in a breeder reactor is an inert gas blanket between the hot liquid sodium pool and the roof structure. Due to the temperature gradients across the cover gas, sodium evaporates into the cavity, where it may condense and form an aerosol. Important parameters of the cover gas system were studied in the experimental research programme NACOWA. In 15 test series the following items were investigated: sodium mass concentration in the cover gas; sodium aerosol particle size, radiative heat transfer across the cover gas, total heat transfer across the cover gas, sodium deposition on the cover plate, temperature profiles across the cover gas, phenomena occurring when the argon cover gas is replaced by helium, enrichment of cesium, iodine and zinc in the aerosol and in the deposits
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