Space nuclear power reactor info needed

I'm looking for diagrams of high-power (hudreds of kW is good,
multi-megawatt is better) *modern* space nuclear power reactors. Don't
need to be high detail, but I need something that I can use for getting
in the ballpark on dimensions, shapes, etc.

Print references are good, links are better, scans are best. Any help
would be appreciated.

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Scott Lowther, Engineer
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