Device for measuring clearance around a pin for centering the upper internal equipment of a pressurized water nuclear

摘要

Device for measuring clearance around a pin for centering the upper internal equipment of a pressurized water nuclear reactor comprising a carrier (b) fixed integrally to a pedestal (7) which makes it possible to fix on the upper plate of the reactor core (1) two travellers (15) which are parallel to the plate (1), two slides mounted to move on the travellers, resilient means (22) for returning the slides and a marking assembly carried by the carrier. Each slide comprises a sensing finger (30) projecting downwards relative to the bearing face of the pedestal (7) and a planar marking plate (31). The marking assembly comprises two styli (33), each directed towards a marking plate (31). A control system (34) makes it possible to compress springs (36) whose force is applied to the styli (33). The clearance measurement can be carried out from a distance and under water.