| 摘要 |
Fuel rods of fuel assemblies of a boiling water reactor are tested for leaks. A plurality of fuel assemblies are each arranged adjacent to one another in a cell of the upper core grid of the boiling water reactor. A hood is placed above the fuel assemblies of a plurality of cells, which form a division for simultaneously heating the fuel assemblies of this division. At least one water sample is taken from each cell of this division, and the water samples from a plurality of cells forming a group are combined and tested for the presence of radioactive fission products contained in the water sample. A plurality of groups are analyzed simultaneously and independently of one another in a number, which number corresponds to the number of groups, of measurement channels of an analysis device. Where a result of a group is positive, the water samples from the cells which are located in this group are fed separately to the analysis device and are analyzed separately in a corresponding number of measurement channels. Those fuel assemblies of a cell that are found positive are tested individually outside the hood.
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