Hi Longview. My though on this matter is simply that if Li6 is 'poison' as axil suggests then any reaction involving Li7->Li6 would soon stop, and a meltdown (for example) would not be possible.
I have explained that the fuel preparation process uses Lithium 7. This step produces the metalized lithium which is meta-stable. The QuarkX reactor shows that the metalized lithium survives temperatures that exceed the melting point of nickel. The fact that the QuarkX can be restarted shows that the metalized lithium can persist in a quiescent state for weeks before being reactivated.
In short, once metalize lithium 7 is formed, it does not require additional attention. In Fact, the purpose of LiAlH4 is to keep additional metalized lithium from forming to avoid a reactor meltdown. LiAlH4 acts as a moderator that provides fuel but does not increase the amount of nuclear active metalized lithium 7(NAE).
The reactor that WizKid built used pure Lithium 7 fluoride and melted down because he did not stop his reaction and add LiAlH4 to moderate the reaction to stop the formation of additional NAEs.
When wine is made, you add some chemical to kill the yeast when the alcohol content reaches 12.5 percent. If this is not done, then the wine becomes too strong as the yeast keeps on increasing.