PWR Technology ou PWR Basics

The concept of the “protective barriers” involves placing a series of strong, leak-tight physical barriers between the radioactive materials and the environment to contain radioactivity in all circumstances: first barrier, second barrier, third barrier.

The concept of “defense in depth” involves ensuring the effectiveness of the protective barriers by identifying the threats to their integrity and by providing successive lines of defence to protect them from failure: first level, second level, third level and beyond.

A pressurized water reactor (PWR) nuclear power unit is a thermal power plant that is called "nuclear" because it uses the heat released by the fission of the nuclei of uranium atoms to produce steam.

The EPR layout offers exceptional and unique resistance to internal or external hazards, especially earthquake and airplane crash.