The SÜS vibration monitoring system detects changes in the vibration behavior of primary circuit components, reactor pressure vessel internals and reactor coolant pumps in pressurized water reactors at an early stage by frequency and amplitude monitoring of the mechanical component vibrations. It meets the specifications and requirements laid down in KTA 3201.4, KTA 3204, DIN 25475/2, VDI 2059, ISO 7919, ISO 10816 and IEC 61502.

A change in the vibration behavior of a component is one of the most sensitive indicators for changes in its mechanical condition, e.g.

• elaxation of tensioning of the flow skirt fixing bolts,
• relaxation of the stiffness of core barrel holddown springs,
• damage to the journal bearing of a reactor coolant pump,
• contact between primary circuit components and building,
• incipient crack in the shaft of a reactor coolant pump.