Pressure pulse method and system for removing debris from nuclear fuel assemblies

This patent describes a system for removing debris from a nuclear fuel assembly of the type having a plurality of fuel rods, each of which is engaged by spring retaining means within a grid. It comprises means for securing the fuel assembly within a pool of water; means for isolating the water surrounding the fuel assembly in the securing means, and at least one pressure pulse source in communication with the water isolated within the isolation means for discharging a series of pulses of pressurized gas within the isolated water that create shock waves for exerting momentary forces on the fuel rods sufficient to dislodge debris but insufficient to cause any of the fuel rods to momentarily disengage the spring retaining means