At Oak Ridge National Laboratory (ORNL) in Tennessee, a unique solution was needed to maintain position integrity on a series of massive shutters, used to control the flow of neutrons of the Spallation Neutron Source (SNS). This neutron delivery system consists of eighteen 30T and 50T shutters, raised and lowered vertically, 20” and 30” respec- tively, by stainless steel hydraulic cylinders. The cylinders operate on tap water, at 2200 psi, tha

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