An automatic tripping of the fall of an absorbent element in the core of a nuclear reactor

In order to trigger automatically without intermediate instrumentation chain falling cioeur absorbent members in a nuclear reactor in the event of drop of the coolant level below a given threshold and, optionally, increasing the pressure beyond a permissible maximum value, is placed between each absorbing member 18 and the rod 20 supporting this element a device 28. this device comprises a clip formed of at least two fingers 30, this clamp being normally locked gripping position by locking members such as balls 46. a float 38 mounted in the rod 20 controls the unlocking of the clamp in one or the other of the two conditions requiring the fall of the absorbent members. (CF DRAWING IN BOPI)