The THERESA test facility at the Zittau power plant laboratory was recently accepted by the authorized inspection body (TÜV-Süd) as part of the "pre-commissioning inspection" (PVI). The tests included the electrical wiring of the safety sensors and actuators, the installation and process-related wiring of the components and the transfer of the system to a safe state if certain limits of the measured variables temperature, pressure and level are exceeded.

In addition to the electronic (active) safety systems, the mechanical (passive) systems such as safety valves were tested by triggering them in a targeted manner. All tests were completed successfully. This means that nothing now stands in the way of official trial operation.

The PVI was preceded by the preparation of numerous approval documents in cooperation with the approved monitoring body during the planning of the plant.

The nature of a prototype test plant posed particular challenges for the licensing authority and the project team led by Prof. Kratzsch, as the standardized procedures for the approval of commercial energy plants were not always applicable to the test plant.

Before the PVI, the licensing authority had to be provided with a hazard analysis, shutdown matrix, circuit diagrams, license application with classification of the plant components, operating manual, documentation on pressure tests as well as manufacturer and conformity declarations for the plant components and safety equipment. Last but not least, Mr. Klette and Mr. Braun had to successfully complete their training as boiler attendants . The authorities then issued a certificate of approval to operate the plant, which was sealed with the successful PVI.

The extensive preparations and coordination with the supervisory authority for the approval of the plant have thus paid off and the THERESA pilot plant can go into regular trial operation.