The reactors with loose fit design of garter spring spacers require their relocation to improve the service life of the coolant channels. Systems have been developed for extending service life of coolant channels by carrying out the task of repositioning of garter springs in new as well as operating reactors.

In order to relocate the GS in irradiated coolant channel, an alternative system called the INtegrated Garter spring REpositioning System (INGRES) had been developed indigenously. This system can perform following functions:

(a) Eddy current based Garter Spring Detection Probe (GSDP).

(b) Eddy current based Concentricity Detection Probe (CDP) for ensuring PT-CT concentricity.

(c) Hydraulically operated PT Flexing Tool (PTFT), for un-pinching the target GS.

(d) Linear induction motor principle based Garter Spring Relocation Device (GSRD) for relocating the garter springs.