I figured as much. what bugged me is that it seemed to be confined to the top of the reactor and never gave me any problem on the bottom. so I tried this design http://www.talonfiremage.pwp.b…qbwjblsmxjtehlsl934j9m1vk oddly enough it holds together. BUT if you mirror the design (aka this http://www.talonfiremage.pwp.b…i8pqbimsdwn7uyovm1nmrzsw0 ) the values are not the same (even in the planner)
Is there something I've missed in how heat is distributed? logicically heat should spread to the top but I didn't think reactors took that into account :p
and thanks for your quick answer omicron!