Indeed, officially the casks conceived during the 1980's are OK, however in 2011 the MIT discovered that "Cracking related to corrosion could occur in 30 years

Indeed, officially the casks conceived during the 1980's are OK, however in 2011 the MIT discovered that "Cracking related to corrosion could occur in 30 years or less, and the Nuclear Regulatory Commission is studying whether the casks can be used for 100 years as some hope." https://archive.nytimes.com/green.blogs.nytimes.com/2011/08/09/researching-safer-nuclear-energy/ https://archive.nytimes.com/green.blogs.nytimes.com/2011/08/...