DEVELOPMENT OF UNCONVENTIONAL TUBULAR LINEAR INDUCTION MOTORS FOR NUCLEAR REACTOR LIFE EXTENSION APPLICATIONS

摘要

The three phase Garter Spring Repositioning Devices incorporated in INGRES (INtegrated Garter spring REpositioning System) tools have been successfully used in repositioning the garter spring spacers in highly radioactive coolant channels of Madras Atomic Power Station during the year 1995 (8 Channels of Unit-2), 1998 (5 channels of Unit -1), 2000 (28 channels of unit-1) and 2002 (29 Channels of unit-1). These devices have helped in extending the life of said coolant channels. Recently, these devices have been used at RAPS Unit-1 for life extension of 67 coolant channels. The performance qualification trials on wet-cum-dry version of three phase GSRD have been completed. This device has been incorporated in wet version of INGRES tool. It may be noted that the wet INGRES is meant for garter spring repositioning in wet coolant channels of PHWRs, viz. the coolant channels filled with heavy water under pressurised conditions (between 2 to 3 kg/sq. cms). The BGSSD development has been completed. A prototype has been fabricated and its qualification trials have been completed. This device (BGSSD) will be implemented shortly in the latest version of INGRES tools in order to tackle bunched garter spring problems.