Are you saying they use raw sodium as the coolant? I thought they used a sodium-based salt liquid? In which case, most of the sodium in the mixture is too tied

Are you saying they use raw sodium as the coolant? I thought they used a sodium-based salt liquid? In which case, most of the sodium in the mixture is too tied up to react with air or water. (edit: yes they do, see https://news.ycombinator.com/item?id=35841237 https://news.ycombinator.com/item?id=35841237)