Candu Reactor Fuel Bundle

This article was originally written and submitted as part of a Canada 150 Project, the Innovation Storybook, to crowdsource stories of Canadian innovation with partners across Canada. The content has since been migrated to Ingenium’s Channel, a digital hub featuring curated content related to science, technology and innovation.

The 100,000th fuel bundle produced for a CANDU reactor. Source: Tom Alföldi; Ingenium 1989.0002

This CANDU fuel bundle commemorates a milestone in Canada’s nuclear-power industry: produced in 1975, it is the 100,000th bundle made in Canada. CANDU is a nuclear-powered electricity generation system developed in Canada after the Second World War. Standing for CANada Deuterium Uranium, CANDU reactors use deuterium oxide — heavy water — to moderate the high-energy nuclear reactions produced by fission within these uranium fuel rods. The heat generated by these reactions produces high-pressure steam, which then drives turbines that generate electricity. CANDU reactors are in use around the world.

The first CANDU-type reactor came into use in Rolphton, Ontario, in 1962.


How much uranium would it take to power your house for an entire year? How is uranium used in a nuclear reactor to produce energy? Join the Canada Science and Technology Museum and Canadian Nuclear Laboratories to find out how Canada is a leading producer of nuclear reactors and how this energy gets to your house.

For more information on Canadian nuclear energy and technologies, visit:

Find out more about the CANDU reactors here:

Profile picture for user Ingenium
Ingenium – Canada's Museums of Science and Innovation

Ingenium represents a collaborative space where the past meets the future in a celebration of creativity, discovery, and human ingenuity.

Telling the stories of people who think differently and test the limits, Ingenium honours people and communities who have shaped history — and inspire the next generation.