Inspection Services

ILD has identified multiple applications for the Evisive microwave scanning technology in power plants. Evisive scan technology is a patented nondestructive method for characterizing the internal structure of a bulk dielectric material through the use of microwave energy. This technology is currently the only qualified method for volumetrically examining rubber expansion joints in nuclear power plants. Additionally, it has been demonstrated to be highly effective in examination of High Density Polyethylene (HDPE) pipe butt-fusion and electro-fusion joints.

Rubber Expansion Joint Condition Assessment

Prior to now, there has been no method to volumetrically examine the rubber expansion joints commonly used in nuclear power plants. These important components have simply been replaced on an as-needed basis, regardless of condition. The Evisive scan system offers a method that can effectively determine the actual condition of a rubber expansion joint and detect defects that could otherwise lead to catastrophic failure of these joints. The Evisive inspection method has been effectively used in more than 10 nuclear power plants to test circulating water expansion joints as well as condenser dogbone expansion joints. A regular inspection program of these joints has been established and replacements are now scheduled based on condition, saving outage time and maintenance costs.

Cold Fusion Detection

A desire throughout the industry to transition from traditional steel piping to corrosion resistant High Density Polyethylene piping, particularly in Service Water applications, has driven the requirement for thorough inspection of the butt fusion joints commonly used in HDPE. The Evisive Scan system has proven to be capable of detecting defects in butt fusion joints, including “cold fused” joints. The Evisive scan detection technique works on different physical principles than the more traditional ultrasonic techniques, such as TOFD. This allows the inspector to determine the quality of joints based on ductility in the fused area rather than just the presence of voids, which do not exist in cold fused joints. This makes the method ideal for inspecting both safety related and non-safety related piping, including Service Water Systems. The new nuclear plants currently under construction (the first in 35 years) are planning to use HDPE piping in critical applications and the Evisive Scan inspection system will enable the condition of the piping joints to be determined before the system is placed into service. This list below is applicable to the overall method, not just rubber expansion joints or HDPE Pipe Inspections:

  • Scan can be performed while equipment is in service
  • Promotes condition based maintenance program in place of calendar based program
  • Detects defects such as water intrusion, oil contamination, delaminations, voids, lack of fusion, changes in thickness, mechanical damage, etc.
  • Scanning system is small and portable
  • Immediate results available through line scan
  • Detailed results of suspect areas will highlight the defects