[en] This report presents results of reactor internals vibration tests and measurements conducted in prototype BWR/4 plants of 251 inch, 218 inch, and 183 inch vessel sizes. Results are also presented for supplemental tests of certain internal design features of later BWR/4 plants. All results are shown to be within acceptable limits. Visual inspections of internals following flow testing showed no evidence of vibration. Plans are outlined for additional vibration measurements in BWR/4 and BWR/5 plants containing new design features. Confirmatory test plans for subsequent similar BWR/4 and BWR/5 plants are discussed