Reddit reviews Megawatts and Megatons: The Future of Nuclear Power and
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Chernobyl Unit 4 was a military plutonium-production reactor making weapons-grade plutonium for nuclear warheads. To do that, it needed to have its fuel rods changed out once-a-month (and then reprocessed to extract the plutonium), and thus couldn't have a containment-building around it. Leaving the fuel rods in for the 18-24 month fuel-cycle that commercial reactors use would allow too much of the wrong plutonium isotopes to build up, thus rendering the resulting plutonium in the rods non-weapons-grade.
No commercial nuclear power reactor has ever been used to make plutonium for warheads. See: Megawatts and Megatons by Richard Garwin and (Nobel Prize laureate {in Physics for 1992}) Georges Charpak: https://www.amazon.com/Megawatts-Megatons-Future-Nuclear-Power/dp/0226284271
If you have time, I read this in a course on the safety and viability of nuclear energy, and it really seemed to cover all the bases. From there, I agree that you'll probably have to look through journals for newer information.
Megawatts and Megatons by Garwin and Charpack: http://www.amazon.com/gp/aw/d/0226284271/ref=pd_aw_sbs_1?pi=SL500_SY115