Reactor assembly comprising nuclear fuel and a system for activating and inserting at least one neutron absorption and / or mitigation element

摘要

A carrier assembly for a nuclear reactor, comprising: a housing (40); a fissile area located in the bottom portion of the housing (40); a free volume located in the top portion of the housing (40); a free space (52) in the fissile area, extending along the longitudinal axis over the height of the fissile area from the end thereof located in the top portion; a sheath (54) bordering the free space (52); and a triggering and insertion system (SI), said triggering and insertion system comprising a capsule (10) having a longitudinal axis, an absorber and/or mitigator member (2) suspended in the capsule, and a triggering and insertion device (DI) designed to release the absorber member in the event of an accidental situation occurring in relation to the assembly. The capsule (10) is inserted into the sheath (54), while the triggering and insertion system is removably mounted in the carrier assembly.