Hi Gentlemen, as a former Hug Project Engineer, it is not typical to have a build up of condensate in the SCR reactor housing. You may see steam from the stack during a cold start condition since (based on ambient conditions) the cooling process can produce moisture but this will evaporate during the run. If you have standing water then there are other issues to consider. Just make sure you drain the stack base regularly and inspect the explosion disks for proper seal.
Regards,