Vattenfall and Uniper own the Ringhals sites, located south of Gothenburg in the Varberg Municipality. Vattenfall announced that both Ringhals Units 1; a Boiling Water Reactor (BWR), and 2; a Pressurized Water Reactor (PWR) shall cease operations in 2020 and 2019, following an economic review. Vattenfall commissioned SNCL to undertake an in-depth verification of the current decommissioning baseline and in doing so generate a Cost Estimate Summary Report, supported by a new detailed preliminary schedule that could be evolved into the first fully executable plan for the site. To execute these works, Vattenfall and SNCL entered into a collaborative framework, creating an environment of sharing, challenge and collective knowledge to realize the benefits of site knowledge in combination with global experience. SNCL deployed subject matter experts from both the United Kingdom and United States to deliver this commission.