초록 ▼

An improved guide plate of the type used in the guide tubes of a nuclear reactor and having a central orifice for conducting coolant, and circular guide holes interconnected by slots for guidingly conducting the movement of control rodlets and control rod vanes through the guide tube is disclosed. T

An improved guide plate of the type used in the guide tubes of a nuclear reactor and having a central orifice for conducting coolant, and circular guide holes interconnected by slots for guidingly conducting the movement of control rodlets and control rod vanes through the guide tube is disclosed. The improvement comprises a plurality of vent openings in the form of vent holes uniformly disposed between the slots of the plate and vent gaps disposed between the outer periphery of the guide plate and the inner wall of the guide tube for reducing turbulence in the flow of coolant through the central orifice, thereby advantageously reducing both fretting and frictional engagement between the control rodlets and the guide holes. The resulting turbulence reduction further advantageously reduces the rodlet drop time through the guide tube, thereby enhancing reactor safety. Additionally, the guide holes of the improved guide plate are chrome plated to further reduce frictional engagement between the control rodlets and the plate.

대표청구항 ▼

An improved guide plate of the type used in the guide tubes of a pressurized water type nuclear reactor and having a central orifice for conducting coolant, and guide holes interconnected by slots for guidingly conducting the movement of control rodlets and control rod vanes through its respective g

An improved guide plate of the type used in the guide tubes of a pressurized water type nuclear reactor and having a central orifice for conducting coolant, and guide holes interconnected by slots for guidingly conducting the movement of control rodlets and control rod vanes through its respective guide tube, wherein the improvement comprises at least one vent opening in said guide plate for reducing both fretting and frictional contact between the control rodlets and said guide holes by lowering the pressure differential and the amount of turbulent flow across the plate.