Very low value for amount of H3 atoms transmuted

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Ah yes, now I remembered an issue that is relevant here. The default depletion chains do not include (n,t) reactions, which will obviously miss tritium production. If you wanted to include production of tritium from Li6, you could make the following change in your chain file:

diff --git a/depletion/chain_endfb71_pwr.xml b/depletion/chain_endfb71_pwr.xml
index 9dbbdb9..5844f3a 100644
--- a/depletion/chain_endfb71_pwr.xml
+++ b/depletion/chain_endfb71_pwr.xml
@@ -67,6 +67,7 @@
   <nuclide name="Li6" reactions="2">
     <reaction type="(n,gamma)" Q="7250600.0" target="Li7"/>
     <reaction type="(n,p)" Q="-2727300.0" target="He6"/>
+    <reaction type="(n,t)" Q="4783800.0" target="He4" />
   </nuclide>
   <nuclide name="Li7" reactions="2">
     <reaction type="(n,2n)" Q="-7250500.0" target="Li6"/>

At some point, I’ll look into getting a better fix for how we handle this in our depletion chains.