Update on the Remediation of Low-Level Radioactive Waste in Port Hope, Ontario

Canadian Nuclear Laboratories (CNL) recently announced that it has completed the excavation and transfer of historic low-level radioactive waste away from the Lake Ontario shoreline in Southeast Clarington.

The placement of the last truckloads of waste in the aboveground mound at the new long-term waste management facility, located about 700 metres north of the shoreline site, marks a milestone for the Port Granby community and the Port Hope Area Initiative (PHAI). CNL is implementing the PHAI on behalf of Atomic Energy of Canada Limited (AECL), a federal Crown corporation.

“The safe and successful completion of this remediation is the culmination of years of hard work and planning carried out by CNL’s Port Hope Area Initiative team, and fulfills a key commitment by the Government of Canada to restore these lands for the local community,” said Joe McBrearty, CNL President and CEO. “This milestone represents continued progress in one of the largest and most complex environmental clean-up missions ever undertaken in Canada.”

Remediation of the legacy waste management site began in 2016 and was undertaken in stages, with each section of the site undergoing a stringent testing process to confirm that all contaminated material had been removed. Verified areas were then backfilled with clean soil and restored by hydroseeding and planting vegetation. As the cleanup neared completion, internal roads and other infrastructure were removed.

Capping and closing of the engineered storage mound at the new facility is underway and expected to be completed in summer 2021, with final landscaping targeted for summer 2022.

Dedicated systems are being installed within the mound and around the perimeter of the new facility to closely monitor the safety and performance of the facility for hundreds of years into the future.

“I want to thank the residents of Port Granby for their support and patience during the decades of community consultation, followed by the remediation and restoration of land in the heart of their rural community,” said Richard Sexton, President and CEO of AECL. “I am very pleased that CNL and its contractors have fulfilled the Government of Canada’s commitment to clean up the lakefront site so generations to come will enjoy the benefits of a cleaner environment.”

The Port Granby Project involves the relocation of approximately 1.3 million tonnes of historic low-level radioactive waste from the legacy storage site on the shoreline of Lake Ontario in Southeast Clarington, to a new, engineered aboveground mound. Ongoing maintenance and monitoring will continue for hundreds of years after the facility is capped and closed. The historic waste resulted from radium and uranium refining operations of the former Crown corporation Eldorado Nuclear and its private sector predecessors, which operated from the 1930s to 1988.

The Port Hope Area Initiative (PHAI) represents the federal government’s commitment to respond to the community-recommended solutions for the cleanup and local, long-term, safe management of historic low-level radioactive waste in the municipalities of Port Hope and Clarington. Through its Historic Waste Program Management Office (HWP MO), Canadian Nuclear Laboratories is implementing the PHAI on behalf of Atomic Energy of Canada Limited, a federal Crown corporation.

Source: CNL

Fukushima: Lessons learned from soil decontamination after nuclear accident

Following the accident at the Fukushima nuclear power plant in March 2011, the Japanese authorities carried out major decontamination works in the affected area, which covered more than 9,000 square kilometres ( 3,470 square miles). On Dec. 12, 2019, with most of this work having been completed, researchers provided an overview of the decontamination strategies used and their effectiveness in the Scientific Journal Soil.

Of primary concern after the Fukushima nuclear incident was the release of radioactive cesium in the environment because this radioisotope was emitted in large quantities during the accident,  it has a half-life of 30 years, and it constitutes the highest risk to the local population in the medium and long term.

This analysis in the journal provides new scientific lessons on decontamination strategies and techniques implemented in the municipalities affected by the radioactive fallout from the Fukushima accident. This synthesis indicates that removing the surface layer of the soil to a thickness of 5 cm, the main method used by the Japanese authorities to clean up cultivated land, has reduced cesium concentrations by about 80% in treated areas.

The removal of the uppermost part of the topsoil, which has proved effective in treating cultivated land, has cost the Japanese state about $35 billion (Cdn.).  This technique generates a significant amount of waste, which is difficult to treat, to transport and to store for several decades in the vicinity of the power plant, a step that is necessary before it is shipped to final disposal sites located outside Fukushima district by 2050. By early 2019, Fukushima’s decontamination efforts had generated about 20 million cubic metres of waste.

Decontamination activities have mainly targeted agricultural landscapes and residential areas. The review points out that the forests have not been cleaned up -because of the difficulty and very high costs that these operations would represent – as they cover 75% of the surface area located within the radioactive fallout zone.


Nano-Scale Selective Ion Exchange used to Remove Radioactive Contamination from Water

Researchers from the University of Helsinki in Finland recently reported that they have developed a new method to remove radioactive contamination from water.  They claim their method of nano-scale selective ion exchange is faster than the conventional method and more environmentally-friendly as less radioactive solid waste is produced.

Risto Koivula, researcher at the University of Helsinki

The new method of selective ion exchange uses electrospun sodium titanate.  Electrospinning is a fibre production method which uses electric force to draw charged threads of polymer solutions or polymer melts up to fiber diameters in the order of some hundred nanometers  “The advantages of electrospun materials are due to the kinetics, i.e. reaction speed, of ion exchange,” says Risto Koivula, a scientist in the research group Ion Exchange for Nuclear Waste Treatment and for Recycling at the Department of Chemistry at the University of Helsinki.

One conventional method of removing radioactive ions from water is using granular sodium titanate as an ion exchange medium.  It is currently used to treat the 120,000 cubic meters of radioactive wastewater generated as a result of the Fukushima, Japan nuclear accident.  As radioactive wastewater is run through the ion exchanger, the radio-active ions are exchanged with the sodium in the sodium titantate.  The radioactive pollutants remain bound by the granules in the ion exchange unit.

Sodium Titanate fibres

The advantage of sodium titanate over other ion exchange media is that it is selective, which means that it is picks out only the radioactive ions from the water.  One disadvantage of ion exchange is that a water pollution problem is being transferred into a waste management problem.  When the ion exchange capacity is filled, the filtering material has to be switched out.  This leaves solid radio-active waste which must be managed.

The utilization of electrospun sodium titanate results in nano-scale spindles.  The result is an ion exchange solution that occupies less space but provides an equal treatment capability.  “Since less electrospun material is needed from the start of the process, the radio-active waste requiring a permanent repository will also fit in a smaller space,” says Koivula.

The electrospinning equipment at the University of Helsinki was developed and built in the Centre of Excellence for Atomic Layer Deposition, led by Mikko Ritala. The researchers successfully tried this quite simple method for working sodium titanate into fibre.  Koivula’s team studied the ion exchange features of fibre produced this way and found it worked like the commercially produced ones.

The utilization of this selective ion exchange method could be applied to the sites with groundwater contaminated with radioactive ions.

In Canada, the Town of Port Hope (located approximately 100 km east to Toronto) has over 1 million cubic metres of low-level radioactive waste as well as radioactive waste in treatment ponds.  The source of the radioactive contamination is the historic operation of the former radium and uranium refining activities of Eldorado Nuclear.  The wastewater treatment facility at Port Hope is a two-stage process that removes salts, heavy metals, and contaminants such as radium and arsenic.  The process involves chemical precipitation with clarification followed by reverse osmosis.