Spanish to English Law/Patents Nuclear Eng/Sci

This phrase appears in a service agreement in Mexican Spanish regarding providing services for a nuclear reactor, e.g. decontamination. Here is the context:

"Previo al inicio de las actividades el proveedor deberá contar con oficio de liberación del área de Garantía de Calidad de la GCN."

My translation:

"Prior to beginning activities, the Provider must ... of the area of Quality Guarantee of the GCN."

Any help would be appreciated!