So traditional reactors like a pressurized water reactor or boiling water reactor, they're very, very hot water at very high pressures, and this means, essentially, in the event of an accident, if you had any kind of breach of this stainless steel pressure vessel, the coolant would leave the core.
Traditionelle reaktorer som en  trykbaseret vand reaktor eller kogende vand reaktor,  det er meget, meget varmt vand under meget højt tryk,  og det betyder, dybest set, at i tilfælde af et uheld,  hvis der er nogen form for brud på de rustfrie trykkamre, så vil kølevæsken forsvinde fra kernen.