Marsein is a long-standing player in Spain’s nuclear sector, having contributed to the development of the country’s nuclear capabilities for nearly 40 years. Today, the company provides maintenance services across multiple facilities and was involved in Spain’s first nuclear reactor decommissioning operations. Marsein offers a comprehensive suite of services—including mechanical maintenance, radiological protection, decontamination, industrial cleaning, scaffolding, and civil engineering.  

Nuvia Soletanche Freyssinet’s (VINCI Construction) subsidiary in the nuclear sector, has been active in sensitive and highly regulated industrial sites worldwide for more than 60 years. Leveraging its experience in the nuclear sector, Nuvia supports customers throughout their facilities' life cycle in demanding environments. The company operates in 17 countries and various sectors including nuclear energy, civil and military defense, nuclear medicine, and environmental services. It provides a comprehensive range of services, engineering solutions and products for the design, construction, operation, and decommissioning of nuclear facilities.  

VINCI Construction is one of the world's leading construction companies, providing solutions for transport infrastructure, buildings, networks, and urban development. The company relies on a network of local business units, specialized networks, and strong expertise in major infrastructure projects. It is involved throughout the entire life cycle of a project – from design and construction to maintenance.