Pooh Bear wrote:
....

You might care to consider that humans will be 'fried' close to a nuclear
reactor.

Lead shielding will make a craft impractically heavy for space flight.



Here's the General Atomic lead and hydrocarbons shield design as
presented to NASA in 1964.

http://spacebombardment.blogspot.com...l-atomics.html


"According to recent studies of planetary
exploration requirements, this shielding is sufficient to attenuate the
probable solar-flare radiation to dose values similar to the 50 REM
allowed for propulsion. the total mission dose from both sources
was expected to be about 100 rem".