Nucleoeléctrica builds a new spent fuel storage system for Atucha II
With the goal of ensuring the long-term operation of Atucha II and strengthening the sustainable management of nuclear fuel, Nucleoeléctrica Argentina is building a new dry storage facility that incorporates state-of-the-art technology and raises the industry's safety standards.
Monday 20 October 2025
Nucleoeléctrica Argentina is advancing with the construction of the Spent Fuel Dry Storage Facility II (ASECG II), a key project to ensure the safe and long-term management of the fuel used in the electricity generation process and to guarantee the continuous operation of the Atucha II Nuclear Power Plant.
Throughout the operational life of nuclear power plants, spent fuel elements are initially stored in pools of demineralized water, known as decay pools, located in radiologically controlled areas within the nuclear buildings. In these pools, the elements remain cooled and safely contained underwater.
However, the capacity of these pools is limited. For this reason, the current international standard in nuclear fuel management is dry storage — a safe, efficient, and sustainable system already adopted in most countries with nuclear development.
In the case of Atucha II, it is estimated that by December 2027 the decay pools will reach their maximum storage capacity. To address this need, Nucleoeléctrica is carrying out the construction of ASECG II, a project designed under the highest international safety standards. This new facility will make it possible to safely store the spent fuel elements.
The project is currently showing significant progress. Major civil works have already been completed, including the high-strength concrete base where the storage silos will be placed. Work is also advancing on the manufacture of key components of the storage system, such as containers, shielded lids, and metal structures that ensure proper containment of the material.
The design of ASECG II includes a passive ventilation system that maintains the temperature of the elements within safe ranges without requiring electricity or human intervention, enhancing its long-term reliability and safety.
With this project, Nucleoeléctrica reaffirms its commitment to technological innovation and the responsible management of the nuclear fuel cycle, aligned with the best international practices and aimed at continuing to ensure safe, efficient, and sustainable power generation for the country.
