Steam generators are heat exchangers that convert the heat in the primary heat transport (PHT) system into the steam that drives the turbines. They typically include thousands of tubes and operate in challenging conditions of heat and stress. Their efficiency is dependent on the maintenance of the integrity of the boundary between the hotter and colder sides of the heat exchanger.

The main components where leakage can occur are the tubes themselves, the divider plate that separates the hot inlet PHT water and the cooled outlet water, and the tube sheet that holds the tubes and separates the PHT water from the secondary water before the PHT enters the tubes.

Inspections are challenging because of the limited access points, the small bore and tight spacing of the tubes, and the high radiation fields, so custom-designed tools are needed.

Our suite of steam generator tools enables fast, cost-effective inspections of the tubes and the detection of leaks. The tools include the tiny rotating ultrasonic tube inspection equipment (TRUSTIE™), the acoustic leak inspection system (ALIS), and the dew point leak detection (DPLD) system.

Why Us?

  • Adaptable Inspection Tooling

    Our tooling is capable of inspecting tubes that have inside diameters as small as 8 mm with up to 150 microns of oxide and tube lengths reaching up to 15 m. It has ultrasonic inspection frequencies from 5 to 25 MHz and rotation speeds up to 1,000 rpm.

  • Data Collection Speeds

    Boasts a 120 mm/min @ 0.2 mm spatial resolution, 600 mm/min @ 1.0 mm spatial resolution, and a U-bend inspection on 66 mm bend radius for 10 mm inside diameter tubes.

  • Probe Types

    Two probes are used by TRUSTIE. The first has a normal beam probe for establishing wall thickness, inside diameter profilometry, volumetric flaw characterization and sizing. The second is a shear wave probe for axial crack detection, circumferential crack detection, and crack characterization.

  • Analytical Methods

    TRUSTIE uses a variety of analytical methods including A-scans, B-scans, C-scans, full waveforms scans, line plots, color plots, isometric data representations, echodynamics and integrated signal processing.