Check for duplicate grid points in collapse_rate
Check for duplicate grid points in collapse_rate

shikhar413/openmc,amandalund/openmc,shikhar413/openmc,mit-crpg/openmc,walshjon/openmc,paulromano/openmc,paulromano/openmc,mit-crpg/openmc,amandalund/openmc,paulromano/openmc,walshjon/openmc,paulromano/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,walshjon/openmc,walshjon/openmc