The SLAR (Spacer Location and Repositioning) Tool

Abstract

The SLAR Tool is a multifunction device for locating and repositioning pressure tube to calandria tube spacers in a CANDU nuclear reactor. Eddy current and ultrasonic probes are used to detect the location of the spacers, measure the pressure tube to calandria tube gap, determine the tilt of the spacers, and inspect the pressure tube for indications of cracked hydride blisters. Hydraulic jacks are used to unload the spacers, and electromagnetic devices are used to move the spacers. The Tool has been extensively tested in a mock-up of a CANDU reactor. A demonstration of the Tool was performed on a single fuel channel at the Pickering Nuclear Generating Station.