Naar Directive was a brutal, yet efficient tactic to prevent Beast infection of large ships.
The directive states that in case of Beast infection, the plasma from the fusion drives is vented into the contaminated section. As a result, everyone in those sections dies nearly instantly. However, the plasma burns Beast matter as well, eliminating the infection before it could pose a threat.
It was created during the Battle of Coruc Farr when the Deacon-class Destroyer Naar-Tel was hit by an infection beam. Since then, it became standard procedure to defend against Beast infection. Despite it is fatal to everything in the endangered area, near-instant vaporization is still better than becoming part of the Beast neural network running through infected ships.