Jet Pump Riser Brace Clamp Vibration Control

The patent replaces the welding process with a mechanical clamp assembly system. The clamp applies compression force to the riser brace and inlet riser interface, creating a mechanically secured connection without thermal cycles or weld metal that could be susceptible to stress corrosion cracking. This substitution eliminates the harmful effects of welding while maintaining connection integrity through pure mechanical means.

The patent changes the connection method from chemical/bonding (welding) to mechanical (clamping). By altering the fundamental parameter of connection mechanism, the system achieves both strong connection and improved reliability against stress corrosion cracking, as the mechanical clamp does not create the same metallurgical vulnerabilities as welds.

The patent divides the reinforcement system into separate modular components: the clamp body, compression elements, and mounting fixtures. This segmentation allows for pre-fabrication of components outside the reactor, quick assembly around the riser brace, and rapid installation without the time-consuming welding process. The modular nature enables fast deployment while achieving the required vibration resistance.

The clamp components are prepared and positioned in advance outside the reactor vessel. The compression elements are pre-loaded or designed for quick actuation, allowing the reinforcement to be installed rapidly during maintenance windows. This preliminary preparation minimizes the time workers are exposed to radioactivity while ensuring the vibration resistance is achieved through pre-engineered mechanical features.

The patent employs a dynamic clamp design where the compression force can accommodate movement and deformation. The clamp maintains sufficient friction and mechanical pressure to damp vibrations while allowing the clamped components to expand and contract thermally. This is achieved through features like adjustable compression, flexible mounting, or design that permits controlled movement without compromising the vibration damping function.

The patent adjusts the compression parameter of the clamp to optimize both vibration damping and thermal adaptability. By controlling the magnitude and distribution of compressive force, the system achieves adequate vibration suppression while leaving enough clearance or compliance to accommodate thermal expansion. The compression level is tuned to balance these two competing requirements.