. Emergency Control Waste Koeberg has a series of lines of defence to ensure safety: . Safety codes require independent off-site sources of power. Koeberg has the national grid plus a dedicated powerline to the three gas turbines at Acacia, near Monte Vista/Edgemead. . Should these off-site sources fail simultaneously, the codes require independent on-site power sources. Koeberg has two diesels dedicated to each reactor, which is the French standard, plus a fifth "swing"' diesel, which can be connected to either reactor. By design, the five diesels are entirely independent. . Any one diesel can supply sufficient emergency power for one reactor, including its associated spent fuel pool. . Should all the diesels somehow fail, the auxiliary feed-water system (AFS) will continue to cool the core. It is steam-driven by heat still being generated in the shut-down reactor and does not need electric power. After a minimum of 10 hours of operation, the AFS water supply may have to be topped up, and this can be done by various means. . If these standard procedures fail, emergency procedures maintained in the Koeberg control room and the technical support centre detail many other "non-standard" ways of injecting water into the reactor or, just as effectively into the steam generators.