초록 ▼

A spring set within a control rod guide tube in a nuclear reactor biases a control rod for movement into the reactor core. The spring set includes at least three springs in series, two being under compression and one in tension. The control rod may be displaced downwardly in a direction away from th

A spring set within a control rod guide tube in a nuclear reactor biases a control rod for movement into the reactor core. The spring set includes at least three springs in series, two being under compression and one in tension. The control rod may be displaced downwardly in a direction away from the core by a cable connected at one end to the control rod support element and at its opposite end to a drum. By winding the cable on the drum, energy is stored in the spring set. During a SCRAM, the drum is released, enabling the spring set to rapidly displace the control rod fully into the core.

대표청구항 ▼

[ What is claimed is:] [1.]1. An assembly for selectively positioning a control rod along a vertical axis in a nuclear reactor core disposed inside a reactor pressure vessel, comprising:a control rod guide tube;a control rod support within said tube for supporting the control rod and movable along s

[ What is claimed is:] [1.]1. An assembly for selectively positioning a control rod along a vertical axis in a nuclear reactor core disposed inside a reactor pressure vessel, comprising:a control rod guide tube;a control rod support within said tube for supporting the control rod and movable along said tube, said support including a support element and a spring within said tube biasing said support element for movement in a vertical direction along said axis toward the reactor core;a cable received within said tube and coupled to said support element;a cable control device including a drive for retracting and releasing the cable; anda control connected to said drive for selectively retracting the cable and said support element within the tube to move the control rod support element in a direction away from the core against the bias of said spring and releasing the cable enabling the spring to displace the control rod into the core.