Abstract: The invention relates to a blocking device (5) for stopping solid bodies that have been irradiated or that are to be irradiated in a conduit system (2) which is used to transport the solid bodies by means of a propelling fluid into and out from a nuclear reactor (1). The blocking device has at least one main body (52) with a continuous channel (521) for the solid bodies and an actuator (58), which is arranged inside the main body (52) and which is adjustable relative to the main body (52) between an open position and a closed position in such a way that the channel (521) for the solid bodies is open in the open position and is closed in the closed position. The actuator (58) can be brought from the open position into the closed position and from the closed position into the open position by being displaced relative to the at least one main body (52). The blocking device can be used in particular as part of an aeroball measurement system (3) or as part of a nuclide activation system (4).

Abstract: A for hardening a bridge assembly of a rotational body having an axis of rotation for an electrical drive, including the steps for balancing and rotational hardening of, rotating the rotational body about an axis of rotation at an imbalance determination rotational speed to detect an imbalance of the rotational body, determining the imbalance of the rotational body, fastening at least one balancing weight to or removing at least one balancing weight from the rotational body at a standstill rotational speed to compensate the imbalance, the hardening including rotating the rotational body about the axis of rotation at a hardening rotational speed, the magnitude of the hardening rotational speed being greater than the magnitude of the imbalance determination rotational speed.