A Canadian icon celebrates an anniversary: 60 years of scientific discovery at the NRU

On November 3, 2017 the National Research Universal (NRU) research reactor, one of Canada’s most productive and impactful science facilities will reach the unprecedented milestone of 60 years in operation.

Based around the Chalk River Laboratories (CRL), in a quiet corner of the province of Ontario adjacent to the Ottawa River, the team at Atomic Energy of Canada (now Canadian Nuclear Laboratories (CNL)) has had made a real difference in the lives of people across Canada and around the globe. Serving as the cornerstone for much of that research for that past 60 years is the NRU reactor. Though designed in the nuclear ‘hey days’ of the 1940’s and early 50’s, the low-temperature, low pressure, 135 MWth (originally 200 MWth) NRU enabled great advances across a wide swath of globally important industrial sectors.


NRU was used to prove out many concepts that later appeared in the Canada Deuterium Uranium (CANDU) heavy-water reactor design; this marvel in engineering has gone on to serve safely and reliably in countries around the globe. Notable among these concepts was “on-power refuelling”, a hallmark of the current CANDU fleet and a feat first accomplished in NRU. As a clean energy source, nuclear technology, proven in NRU, has powered the lives of millions while avoiding billions of tons of greenhouse gas emissions.

NRU and the people at CRL spawned a global medical radioisotope industry. While much of the spotlight today shines on the critical role this reactor played in the production of molybdenum-99, truth be told, NRU served to advance a number of radiopharmaceuticals including iodine-131, an isotope used mainly in therapy, imaging and diagnosis; iodine-125, used in prostate cancer treatment (brachytherapy), in-vitro diagnostic kits (radio immunoassays), bone densitometry devices and protein iodination; xenon-133, a medical diagnosis tool, especially for scanning lungs; high specific activity (SA) cobalt-60, primarily used in cancer treatment applications; and most recently enabling production of yttrium-90, for treatment of liver cancer. Over the past 60 years of operation, this reactor has enabled medical treatments for well over 500 million patients globally.

NRU has provided the neutron source to conduct research across a wide spectrum of sciences, both applied and basic. Neutrons from NRU have been used to examine pieces of space shuttles to answer key questions on materials performance; they have shined new light into planes, trains and automobiles (pun intended) in the ongoing search for lighter, stronger and higher performance materials and manufacturing techniques; they have helped us answer key questions around human health and biological function; helped us discover new innovative approaches to drug delivery; and examined root systems to help address global food production issues as a result of climate change.

NRU has indeed made a difference in the world, and on the 60th anniversary of its first start-up, it is an opportunity to pause, reflect and celebrate.

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