Here are interesting SANDIA documents in the area of spent fuel pool accidents. These are heavily sanitized and I want the original reports.
Here is a GAO report that is not sanitized:
The above GAO report refers to access to classified reports as follows:
The draft report recommends that the NRC Chairman direct the agency staff to develop a mechanism that allows individuals with appropriate clearances and the need-to-know to easily identify and access classified studies and help ensure that institution knowledge is not lost.
So, if I want to find out what is going on at SANDIA and elsewhere I'll have to become one of tthe "... individuals with appropriate clearances and the need-to-know ... ."