Cup bearings in nuclear reactors

Cup Bearings in Nuclear Reactors


In nuclear reactors, various types of bearings are used to support the rotating components and ensure smooth operation. One such type is cup bearings, which play a critical role in maintaining the stability and efficiency of these reactors. In this article, we will explore the significance of cup bearings in nuclear reactors and their various applications.

Understanding Cup Bearings

Cup bearings, also known as tapered roller bearings, are a type of rolling element bearing that can support high radial and axial loads. They consist of an inner ring (cup) and an outer ring (cone), with tapered raceways on their surfaces. The tapered design allows for efficient distribution of the load, reducing friction and enhancing the bearing’s ability to withstand heavy loads.

Applications in Nuclear Reactors

Cup bearings find extensive use in nuclear reactors due to their unique characteristics. Let’s explore some of the key applications:

1. Reactor Coolant Pump

In nuclear reactors, cup bearings are commonly used in reactor coolant pumps. These pumps circulate coolant through the reactor core to remove heat and maintain the desired temperature. Cup bearings provide reliable and smooth operation, even in high-speed and high-temperature environments.

2. Control Rod Drive Mechanism

The control rod drive mechanism is vital for controlling the reactor’s power output. Cup bearings are employed in this mechanism to support the movement of control rods. Their ability to handle both radial and axial loads ensures proper functioning and precise positioning of the control rods.

3. Turbine Generator

In nuclear power plants, cup bearings are utilized in turbine generators, which play a crucial role in electricity generation. These bearings support the rotating components of the turbine, such as the shaft and rotor, allowing for smooth and efficient power generation.

4. Reactor Coolant System Valves

Cup bearings are also used in various valves within the reactor coolant system. These valves control the flow of coolant and ensure the safe operation of the reactor. The high load-carrying capacity and durability of cup bearings make them suitable for withstanding the demanding conditions in these valves.


Cup bearings are indispensable components in nuclear reactors, providing reliable support and smooth operation for critical systems. Their applications encompass reactor coolant pumps, control rod drive mechanisms, turbine generators, and coolant system valves, among others. As a leading supplier in the Chinese bearings market, our company offers a wide range of high-quality products, including cup bearings, cage bearings, shielded bearings, track bearings, plastic rollers with bearings, ball bearing rollers, sliding bearings, and more. With our state-of-the-art manufacturing facilities and dedicated customer service, we strive to deliver exceptional products at competitive prices. Contact us today for customized solutions tailored to your specific requirements.

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