METHOD AND DEVICE FOR RESTORING THE FALL-TIME OF AT LEAST ONE CONTROL CLUSTER FOR REGULATING REACTIVITY IN THE CORE OF A LIGHT-WATER-COOLED NUCLEAR REACTOR

摘要

The invention relates to an expansion (21b, 21c) of the guide channels (16b, 16c) of the guide tube (8) in at least one continuous guide area. Said expansion is provided on at least one guide tube of the activated upper internal equipment of the nuclear reactor in a nuclear reactor pool after the reactor has been stopped and cooled following a period of operation, preferably by machining discontinuous cavities along the length of the guide channel (16b, 16c). Said expansion is preferably provided in the guide tube (8) which is located in the upper internal equipment on a storage stand in the reactor pool.