Deteriorating Radioactive Barrels in Atlantic Pose Dilemma for Researchers

A decade-long research project has revealed that hundreds of thousands of radioactive waste barrels, dumped in the Atlantic Ocean off the coast of Galicia, Spain, are in a critical state of deterioration. The findings from the NODSSUM project, a collaboration involving French scientific missions, highlight a growing environmental concern with no easy solutions.

Deep Sea Dumping Grounds

From 1946 to the early 1990s, several European countries, including the UK, Netherlands, Belgium, and France, disposed of low and medium-activity radioactive waste in a designated area of the Atlantic seabed, approximately 500 kilometers off Cape Finisterre. This vast underwater “graveyard” covers about 10,000 square kilometers at depths of 4,000 to 5,000 meters. It is considered the third-largest known repository of canned nuclear waste globally.

The waste consists of civilian and military radioactive materials, including sludge, laboratory equipment, medical waste, resins, and contaminated scrap metal, encapsulated in cement or tar. Initial documentation of these disposals was minimal, with less than 1% of the total waste cataloged.

Alarm Raised by Fishermen and Activists

The issue first came to public attention in 1981 when a Galician fishing vessel, the Xurelo, reported suspicious dumping activities. Environmental groups, including Greenpeace, actively protested these practices, leading to a moratorium on further waste disposal, which remains in effect.

The NODSSUM project, initiated a decade ago, has been systematically mapping the dumping site. Their expeditions have identified approximately 3,350 barrels within a mapped area of 140 square kilometers, indicating a density of about 20 barrels per square kilometer.

Critical State of Deterioration

Recent missions, utilizing the manned submersible Nautile, have provided direct visual evidence of the barrels’ condition at great depths. Researchers from the Centre National de la Recherche Scientifique (CNRS) have concluded that the barrels are in an “advanced state of deterioration.” Observations include corroded surfaces, colonization by deep-sea anemones, visible cracks in the metal, and leakage of encapsulating material like tar and cement.

While laboratory analysis of sediment and water samples has not yet revealed significant anomalies, radionuclide levels detected in some samples exceed previous estimations, despite remaining below legal limits.

The Dilemma of Retrieval

The primary objective of current research is to understand and contain the potential threat posed by these decaying barrels. The question of whether to retrieve the estimated 200,000 barrels from the seabed presents significant challenges. Technically feasible, the process is fraught with political, economic, and safety risks.

The Spanish Nuclear Safety Council (Consejo de Seguridad Nuclear) has stated that radioactivity levels in Spanish coastal waters remain below regulatory limits. Furthermore, Spain bears no responsibility for the dumping, as it did not contribute waste to this specific site.

A significant concern is that many barrels are so degraded that they might disintegrate during the retrieval process, potentially releasing their contents. Researchers are actively investigating the long-term implications of this ongoing decay, including potential bioaccumulation in the deep-sea food chain and its impact on the unique abyssal ecosystem.

Key Facts

The findings underscore the long-term environmental consequences of historical waste disposal practices. For AI and technology audiences, this situation highlights the complexities of managing legacy industrial waste and the critical role of advanced robotics and deep-sea monitoring technologies in assessing and potentially mitigating environmental risks. The ongoing research, utilizing sophisticated submersibles and analytical tools, pushes the boundaries of our understanding of deep-sea environments and the challenges of addressing human-made contamination in these remote locations.

Source: Tras 40 años en el mar gallego, los bidones radioactivos sufren un estado crítico de deterioro. La solución puede ser peor que dejarlo estar – Xataka: https://www.xataka.com/magnet/40-anos-mar-gallego-bidones-radioactivos-sufren-estado-critico-deterioro-solucion-puede-ser-peor-que-dejarlo-estar