The WENRA Reactor Harmonization Working Group (RHWG) recently completed the Guidance Document for Issue T: Natural Hazards.

One of the Key recommendations from ENSREG following the completion of the European Stress Tests was to develop reference levels and guidance on the subject of Natural Hazards to drive harmonisation and improve safety. 

The purpose of this Guidance is to provide explanations of the intent of the Safety Reference Levels (RLs) of Issue T, to contribute to a consistent interpretation and to permit insights into the considerations which have led to their formulation. In addition, some background information is provided for easy reference.

This Guidance does not define any additional requirements. Furthermore, it is important to recognize differences in national regulations and in reactor designs when using this document. However, the overall content and meaning is in all cases relevant.