Kinectrics Inc. | Custom Circumferential Wet Scrape Tool (CWEST) Design & Supply

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Kinectrics Inc.
800 Kipling Avenue
Toronto Ontario M8Z 6C4

416-207-6000
info@kinectrics.com

https://www.kinectrics.com/projects/updated-design-supply-of-a-custom-circumferential-wet-scrape-tool

During operation, the pressure tubes (PT) of CANDU reactors are known to absorb deuterium. Over time, the accumulation of deuterium can threaten PT integrity. Specifically, a high PT deuterium concentration increases the risk of Delayed Hydride Cracking initiation from severe flaws, which reduces the PT fracture toughness and can result in the formation of hydride blisters. Therefore, the monitoring of deuterium uptake in PTs is important for the continued operation of ageing CANDU reactors.Monitoring of the deuterium requires that samples are taken from the tubes at key locations using a custom designed tool known as a the Circumferential Wet Scrape Tool or CWEST*. This tool interfaces with the Rapid Delivery Machine (RDM) to collect samples from fuel channels under shutdown conditions. The samples are then transferred from the tool to a flask by means of a retrieval system, so that they can be taken for deuterium content analysis.With some challenges to the historic tools Ontario Power Generation required an improved design and the supply of new tools.