Fixed cluster with spider-shaped support, corresponding nuclear pressure water reactor core and assembly comprising a nuclear fuel element and said fixed cluster

摘要

Fixed cluster (1) for core (47) of pressurized nuclear water reactor, the cluster comprising: - bars (3) intended to be inserted into guide tubes of a nuclear fuel element (45); - a support ( 5) for the bars (3) from which the bars (3) extend along a longitudinal direction in a direction intended to be oriented vertically downwards when the fixed cluster (1) is arranged on a nuclear fuel element (45) ; - at least one longitudinal support element (41) against the upper plate (51) of the core (47) of the nuclear reactor, the support (5) comprising: - a handle (7) having a longitudinal central axis (C) ; - fins (9) extending radially outwards from the handle (7); - systems (10) for fixing the bars (3) distributed on the fins (9); and- at least two support elements (41) on the upper plate (51) of the core, each of which support dichoselements (41) protrude longitudinally from a respective fin (9), beyond the fixing systems (10) , in a direction intended to be oriented vertically upwards when the fixed cluster (1) is arranged on a nuclear fuel element (45), characterized in that the support elements (41) are arranged radially outside with respect to the fixing systems (10) adjacent.