EXPERIMENTAL STUDY ON PROPERTIES OF IMPACT RESISTANCE FOR VIBRATION-ABSORPTION FACILITIES IN PLANTS

A fall of transportation containers contained spent nuclear fuel would cause serious impact damage to the spent nuclear fuel receiving and storage facilities. To study the properties of impact resistance for different vibration-absorption facilities, the drop-hammer impact tester was used to perform impact tests on 10 different vibration-absorption facilities, in which time-history curves of impacts and impact depths on vibration-absorption facilities in different impact areas taking material strength, thickness of the vibration-absorption layers, material combination types and cross sections of hammers as variables. The test results showed that under the action of impact loads, the specimens exhibited an increase in impact reaction forces and a decrease in deformation of the vibration-absorption layer and impact contact time with the increase of material strength and cross sections of hammers. Laying XPS boards above and below the vibration damping blocks could effectively reduce the peak value of impact reaction, and the XPS board was laid under the block, the specimens exhibited an decrease in impact reaction force in the bottom and a promotion in vibration reduction effect; the dynamic amplification factor γ of the impact dynamic strength ranged from 0.83 to 1.19, and the depth correction factor α of the hammer head was between 0.61 and 0.98.To meet the needs of engineering design, a set of simplified design formulas for vibration reduction facilities was proposed based on the data analysis.