Remotely operable modular shear system for shearing nuclear reactor spent fuel conceptual design. Final summary report

摘要

A unique feature of the shear system is the requirement for a removable master tool module and tool submodule assembly. Each tooling submodule is designed specifically to meet the compaction, gagging, and shearing requirements for specific spent fuel assemblies. These submodules are interchangeable within a common master tool module housing. The cross section of the spent fuel assemblies range from a 4.575-in. hexagonal shrouded to a 8.75-in. square grid-unshrouded. A number of interrelated initial design problems had to be solved: a hydraulic force system arrangement with minimum spacing between cylinders; readily removable couplings between the force system and associated tooling submodule; couplings with maximum stiffness and minimum geometry; a roller bearing system for each tool submodule and hydraulic stem assembly; and long life tool operation under high loads, wear, high temperaure, and corrosive conditions. It was established that the cylinder arrangement should consist of three 200-ton, 10-in. dia tandem cylinders, and one 100-ton, 10-in. dia standard cylinder at 3000 psi operating pressure. The shear would be operated by two - 200 ton tandem cylinders in a vertical straddle mode about the horizontal center line of the tooling arrangement. The compactor would be operated by one - 200 ton tandem cylinder at the center line of the fuel assembly and tooling arrangement. The gag would be operated by one - 100 ton standard cylinder at the center line of the compacted fuel assembly and tooling arrangement.