Abstract: A hydraulic time delay valve includes a hydraulic timer valve having a valve pressure port, a valve return port, a valve cylinder port and a porting device for porting hydraulic fluid from the valve pressure port to the valve cylinder port. A cylinder is coupled to the timer valve and has a cylinder return port and an opening port at the bottom. A piston in the cylinder is axially movable from a depressed position in which the piston blocks the opening of the cylinder to an extended position in which the piston frees the opening. A control applies hydraulic fluid under pressure to the opening. The control includes a fluid restricting device for restricting fluid flowing to the opening. Thus, hydraulic fluid applied under pressure to the valve pressure port depresses the piston to its depressed position and hydraulic fluid applied under pressure via the control is restricted by the fluid restricting device for a period of time determined by a desired time delay.

Abstract: A permanent locking device for a nuclear waste container which, in combination with a lid and a box, utilizes a dee-shaped ring held by a wide, flat hinge and a protruding narrow malleable metal retaining strap. The ring can rotate or slide up and down within the hinge, as well as slide side to side. The hinge has a slot in its top for temporarily holding the ring in an up position while the lid is open and the box is being loaded with nuclear waste. When the lid is closed and the ring is disengaged from the slot, the ring can be quickly dropped to a down position permitting the retaining strap to extend through the ring. The retaining strap can then be readily bent down and over the circular (bottom) portion of the ring, to form a permanent seal. A deformable rubber gasket is positioned between the lid and the top edges of the box to form an air tight seal.