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  • 1 Central Institute of Nuclear Research Rossendorf P.O. Box 19 D-0-8051 Dresden (Germany)
  • 2 Kernkraftwerk Greifswald D-0-2200 Greifswald (Germany)
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Rough techniques for pinpointing defective fuel pins during actual reactor operation were developed for nuclear power plants. These techniques are based on various fission product concentration ratios. Here, a new cesium concentration ratio,134Cs/136Cs, was tested in combination with the more usual cesium ratio134Cs/137Cs. This new cesium ratio confirmed the conclusions drawn from the ratio134Cs/137Cs and provided some additional information on the location of the defective fuel rods. Application of this second cesium ratio improves the reliability of the rough localization method.