What is the fine-grained topic of the following text: The major impacts of this phenomenon can be classified in three main categories: the mechanical impact on the TSP due to an increase of the pressure drop, the impact on the safety demonstration itself due to the less secondary side inventory that have to be considered for the thermal-hydraulic studies and finally the impact on the normal transients mainly due to the level oscillation encountered in the steam generator. Only return the topic.
Impacts of increased pressure drop on the TSP, safety demonstration, and normal transients in the steam generator.