Nuclear	power	plants	have	specific	emergency	plans	in	order	to	ensure	that	emergency	systems	 are operational and to guarantee the safety of employees and the public, which include both an External Emergency Plan (Plan de emergencia exterior) (PEN), for which the governmental authorities are responsible, and an Internal Emergency Plan (Plan de emergencia interior) (PEI), compliance with which is the responsibility of the companies that own the power plant.