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 Servicing the in-bundle region of steam generators with a manual process poses some serious risks to operating personnel. Brooks has developed a better way for Utilities to perform this important process.
Introducing a flexible delivery system that can deploy a variety of service tooling options and eliminate needless operator risk. The Manual In-bundle Guidetube System (MIGS) continues the company’s tradition of developing unique, industry-advancing solutions for the energy industry.
Safety is one of the key driving forces behind the design of MIGS. Using the system, operating personnel never need to penetrate the plane of the access opening. Typically, MIGS reduces
radiation exposure by 50 percent compared to manual in-bundle services.
MIGS is specifically designed for the secondary side in-bundle services at the top of the support plate and tube elevations. Use it to deploy a wide variety of service tooling:
- Inspection probes with working channels
- Retrieval tooling
- Abrasive cutting tool
- Future tooling
The system can also visually inspect new fuel assemblies before shipping.
MIGS is designed to operate in square and triangular pitched steam generators. It can be operated through 2-8 inch inspection ports and handhole openings. The system has precise column indexing with sight location feedback to ensure accuracy. And it has a radiation-tolerant camera assembly.
Brooks personnel use MIGS to create a video-recorded inspection of the lanes between tube columns or between the tube rows, depending on the need. First, the MIGS unit is mounted to the steam generator handhole or access port. Next, the guidetube is indexed to the area of interest using the location template inscribed on the system. The video recorder is deployed through the MIGS system into the secondary side tube bundle of the generator. The system is advanced to the end of the tube lane or until an obstruction blocks the advance. The inspection is performed while slowly pulling the system back.
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