default fissionable material to false
default fissionable material to false

johnnyliu27/openmc,mit-crpg/openmc,liangjg/openmc,johnnyliu27/openmc,samuelshaner/openmc,paulromano/openmc,lilulu/openmc,samuelshaner/openmc,johnnyliu27/openmc,walshjon/openmc,nhorelik/openmc,smharper/openmc,bhermanmit/openmc,amandalund/openmc,johnnyliu27/openmc,smharper/openmc,shikhar413/openmc,paulromano/openmc,walshjon/openmc,wbinventor/openmc,amandalund/openmc,shikhar413/openmc,lilulu/openmc,sxds/opemmc,shenqicang/openmc,wbinventor/openmc,mit-crpg/openmc,lilulu/openmc,wbinventor/openmc,shikhar413/openmc,samuelshaner/openmc,kellyrowland/openmc,kellyrowland/openmc,nhorelik/openmc,samuelshaner/openmc,mit-crpg/openmc,liangjg/openmc,wbinventor/openmc,mjlong/openmc,paulromano/openmc,walshjon/openmc,sxds/opemmc,walshjon/openmc,shenqicang/openmc,mjlong/openmc,liangjg/openmc,shikhar413/openmc,smharper/openmc,smharper/openmc,liangjg/openmc,amandalund/openmc,bhermanmit/openmc,paulromano/openmc,amandalund/openmc,mit-crpg/openmc