In the nuclear industry, flow induced vibrations are assessed early in the design process and the results are incorporated in the design procedures. This report is a general survey of experimental and calculational methods in this area of structural mechanics. It was written by Dr. R.J. Gibert of CEA, France. Contents: 1. Introduction; 2. Scope; 3. Fluidelastic phenomena: General description; 4. Methods used for the prediction of LMFBR vibrations; 5. Impact on the design; 6. Measurement and vibrational monitoring; 7. Conclusions and recommendations; References.