Zuverlässig — reliable, from sich verlassen auf, to rely upon. The same word is used of a machine and of a person, and it is among the strongest compliments in German for either.
Es läuft — it runs. Said of a machine, a process or a business, and it means everything is as it should be.
Da kann nichts passieren — nothing can happen there. The German assurance, and it is stated absolutely.