The vessel is pressurized using rapid pressurization to achieve a high strain rate to assist in the final closure of voids within the workpiece, with the increase in the strain rate lowering the flow stress requirements for the workpiece, thereby making the workpiece more susceptible to plastic deformation. The pressure in the vessel is ramped to an operating pressure and held for approximately 10-120 seconds. The workpiece is loaded into a pressure vessel. In the process, a workpiece is heated prior to the forging process, such as from a previous processing step. , each filler plate being arranged between a pair of said second side pieces and the cladding plates of two adjacent fuel units, the filler plates having the same thickness as the second side pieces the method further comprising enclosing the entire assembly in an envelope evacuating the interior of the entire assembly through said envelope applying inert gas under a pressure of about 10,000 psi to the outside of said envelope while at the same time heating the assembly to a temperature above the flow point of the cladding metal but below the melting point of any material of the assembly, whereby the envelope is pressed against the assembly and integral bonds are formed between plates, sheets, first side pieces, and end pieces and between the sheets and the second side pieces slowly cooling the assembly to room temperature removing the envelope and dissolving the filler plates without attacking the cladding metal.Ī pneumatic isostatic forging process for densification of near net shape workpieces is disclosed. A method of making a fuel-containing structure for nuclear reactors, comprising providing an assembly comprising a plurality of fuel units each fuel unit consisting of a core plate containing thermal-neutron-fissionable material, sheets of cladding metal on its bottom and top surfaces, said cladding sheets being of greater width and length than said core plates whereby recesses are formed at the ends and sides of said core plate, and end pieces and first side pieces of cladding metal of the same thickness as the core plate positioned in said recesses, the assembly further comprising a plurality of second side pieces of cladding metal engaging the cladding sheets so as to space the fuel units from one another, and a plurality of filler plates of an acid-dissolvable nonresilient material whose melting point is above 2000. 3646 Enchanted Lake Ct NW, Conyers, GA 30012ģ9099 Leading Creek Rd, Middleport, OH 45760ġ19 Springwood Rd, South Portland, ME 04106ģ5 Fisher Mobile Home Park, Cottageville, WV 25239ġ.
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