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Oh no 5% is best case, older designs may use only 3%.
It's safety and cost.
When the current nuclear fuel cycle was thought of the idea was the waste would be recycled as soon as the decay heat output calmed down enough for the spent fuel to be transported.
If the uranium were highly enriched and the reactor was of a 2 mode design where it could start as a PWR and switch to a BWR it could use up substantially more fissile material.
But the cost goes way up to do that.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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