A few months ago I started talking to Jim Dewar about his latest book, which I reviewed in August. My suggestion to him was that he needs to write a better introduction that assumes the technical knowledge of rocketry but not the nuclear industry. He took on the task and recruited a number of people to serve as reviewers, myself included. So far, it hasn't been published anywhere, but he's given me a copy and invited me to publish it here.
To avoid confusion, I've put it on my website:
A Technical and Economic Introduction to Nuclear Rockets
It's long but divided into sections, and I think Dewar has done a great job, so check it out.
Jim tells me he would like to hear feedback.