Investigations on the availability of second shutdown system of Indian FBR

Based on the design review of second shutdown system, in-house and international experiences, investigations related to the electromagnetic coupling, flow induced vibrations, subassembly bowing and the deterioration of electromagnet parting plane were carried out as part of the current experimental programme. Various innovative methods/schemes were adopted in the studies. These investigations helped in identifying the design vulnerabilities and thus in improving the system design, qualifying respective analytical/numerical studies, providing direction for further enhancement in system performance, demonstrating the margins available in the system design and more importantly much needed insights into various phenomenons to attend any unforeseen availability related issues of second shutdown system during their operation in reactor. Alternative design concepts were also discussed.