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In this case just test of the whole number of FAs is correct. But the test of the whole number of FAs leads to the unjustified prolongation of outage. 2. Existing methodology of in cask CLTI has sufficient drawback in determination of large cladding defects. It is evident that the great part of gaseous and volatile fission products is bringing out from the fuel rod with serious defect while reactor is cooling down and pressure is dropped before outage procedures. Thus FAs that have fuel rods with serious defects may not be detected during the standard CLTI method in Cask test.

Displaceable modules: The function is to transport the eddy current modules, television cameras, lights, etc. to any position along the length of the fuel assembly. The mechanical equipment is designed and manufactured taking into account the high levels of radiation to which it will be exposed and the fact that it will operate under water. An overview of the SICOM equipment handling a dummy assembly during the qualification test at TECNATOM is shown in figure 2. 35 FIGURE 2. 2. Visual and dimensional inspection system Dimensional measurement aims to measure variation in overall fuel assemblies geometry, namely that caused by the irradiation induced growth of the components, and the general distortion of the assembly.

3 Qualification tests performed on neutron radiographs from an irradiated fuel rod Quality inspection of neutron radiographs (Fig. 3, 4): The cellulose nitrate film and dysprosium foil techniques were both applied in neutron radiography of an irradiated fuel rod from a fuel assembly irradiated in the HBWR4. For assessment of the neutron radiography quality, it is necessary to use indicators that expose the resolution and sharpness of details of the neutron radiographs. Known features, such as the fuel rod instrumentation — in the example a bellows pressure transducer (PF), can be used as a quality indicator.

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