I found some interesting articles on small nuclear reactors and maritime reactors from the 1960s. The business case they make for the small reactors as well as how to construct and run them economically are quite similar to those made for small modular reactors today.
New Scientist No. 288 (24...
USAF interplanetary spacecraft concept model using Space Power Unit Reactor (SPUR) found on EBay.
Description from EBay:
I read on whatifmodelers forum (I think from an uk75 post) that there were some studies for nuclear powered tanks in the US in the 50's.
I would like to learn more about this designs and see drawings if it is possible ::)