Fuel Clad Chemical Interaction (FCCI) is one of the life limiting issues in the MOX fuel pins of fast breeder reactors. Clad wastage due to FCCI coupled with stress arising from fission gas pressure and Fuel Clad Mechanical Interaction (FCMI) due to fuel swelling can lead to fuel pin failure. Non-destructive evaluation (NDE) techniques such as Gamma Scanning, Eddy current testing and Neutron Radiography have been successfully used on MOX fuel pins of a test sub-assembly irradiated in Fast Breeder Test Reactor (FBTR) to a burn-up of 112 GW d/t to detect signatures of FCCI. The results obtained by the various NDE techniques have been correlated and verified through metallographic examination on fuel pin cross-sections. The measured clad wastage of 85 μm agrees well with a model developed for MOX fuel with high Pu content. The results of examinations have enabled validation of the model and given confidence to the designer that PFBR MOX fuel can safely attain the target burn-up of 100 GW d/t.

燃料包覆化学相互作用（FCCI）是快速增殖反应堆MOX燃料销中的寿命限制问题之一。由于FCCI造成的包层浪费，以及裂变气体压力引起的应力，以及由于燃料溶胀而引起的燃料包层机械相互作用（FCMI）可能导致燃料销故障。无损评估（NDE）技术（例如伽马扫描，涡流测试和中子射线照相技术）已成功应用于在快速繁殖试验堆（FBTR）中辐照至112 GW燃耗的测试组件的MOX燃料销上。 d / t检测FCCI的签名。通过各种NDE技术获得的结果已经通过燃料销横截面的金相检查进行了关联和验证。测得的包层损耗为85μm，与为高Pu含量的MOX燃料开发的模型非常吻合。