David L. Major is a prominent inventor based in Wilmington, NC (US), known for his significant contributions to nuclear reactor technology. With a total of 10 patents to his name, Major has developed innovative methods that enhance the safety and efficiency of control systems in nuclear reactors.

Latest Patents

Among his latest patents, Major has introduced groundbreaking methods for moving an induction coil to control elements within a nuclear reactor. His patent on control rod drives describes a system where linearly-moveable control elements operate inside an isolation barrier. These control rod drives utilize secured magnetic elements that are influenced by magnetic fields. The induction coils generate these magnetic fields and can be moved across the full stroke length of the control element in the reactor. A motor is employed to spin a linear screw, which facilitates the movement of the induction coils on a vertical travel nut. The control rod assembly is designed to house the magnetic elements and can directly and removably connect to the control element. This assembly locks with magnetic overtravel latches inside the isolation barrier to maintain an overtravel position. Additionally, overtravel release coils located outside the isolation barrier can release the latches, allowing the system to exit the overtravel position. The operation includes moving the induction coils with a linear screw to drive the control element to desired insertion points, including full insertion by gravity after de-energization. Importantly, no direct connection penetrates the isolation barrier.

Another notable patent focuses on stationary isolated rod couplings for use in nuclear reactor control rod drives. This invention also features linearly-moveable control elements within an isolation barrier, utilizing secured magnetic elements influenced by magnetic fields. The induction coils generate these magnetic fields across the full stroke length of the control element. A closed coolant loop is incorporated to cool the induction coils, which are situated in a vacuum outside the isolation barrier. The control rod assembly in this patent similarly houses the magnetic elements and connects to the control element. The assembly locks with magnetic overtravel latches to maintain an overtravel position, with release coils outside the barrier to facilitate movement. Methods of operation include selectively energizing or de-energizing induction coils to drive the control element to desired insertion points, ensuring safety and efficiency.

Career Highlights

David L. Major is currently employed at GE-Hitachi Nuclear Energy Americas LLC, where he continues to innovate in the field of

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