Method and device for separating lithium-7 from the primary coolant loop of a nuclear power plant

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Abtrennen von Li oder Bor aus dem Primärkühlkreis eines Kernkraftwerks. Erfindungsgemäß wird vorgeschlagen, das Li oder Bor mittels Membranelektrolyse aus dem Kühlwasser abzutrennen. Li is removed from a nuclear plant primary cooling circuit by withdrawing cooling water from the circuit and passing it through an electrolysis module (3) in which Li is separated by membrane electrolysis using only cation-selective membranes without simultaneous separation of boron by anion-selective membranes, the discharged dilute being fed back to the circuit. Independent claims are also included for (i) a similar process for removal of boron instead of Li by using anion-selective membranes, and (ii) apparatus for carrying out the above processes.