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1. (WO2017017242) NUCLEAR REACTOR WITH SCREW-NUT DRIVE OF THE CORE REACTIVITY CONTROL MEMBERS

Pub. No.:    WO/2017/017242    International Application No.:    PCT/EP2016/068114
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Fri Jul 29 01:59:59 CEST 2016
IPC: G21C 7/12
G21C 7/14
G21C 1/32
G21C 9/02
Applicants: SOCIÉTÉ TECHNIQUE POUR L'ENERGIE ATOMIQUE
Inventors: RANC, Lionel
DUMANOIS, Charles
ROUILLER, Jean-Luc
Title: NUCLEAR REACTOR WITH SCREW-NUT DRIVE OF THE CORE REACTIVITY CONTROL MEMBERS
Abstract:
The nuclear reactor comprises a plurality of mechanisms (11) that drive the control members (9) that control the reactivity of the core, each one comprising: - a driving member (21) comprising a driving part (23) forming one out of a screw or a nut; - a member (27) for applying a rotary torque of the rotor (19) to the driving member (21); - a driven member (29) translationally connected to one of the control members (9) and comprising the other out of a screw and a nut; - a member (33) that is selectively mobile between a position of blocking the driving member (21) and a position of releasing the driving member (21). In each drive mechanism (11): - the motor (15) is fully immersed in the primary coolant inside the vessel (3); - the rotor (19) has a central passage (35), the member for applying the rotary torque (27) being situated in or near the central passage (35); - the driving member (21) comprises a connecting part (37) engaged in the central passage (35) and collaborating with the member for applying the rotary torque (27), the connecting part (37) being free to effect a translational movement inside the central passage (35) with respect to the rotor (19) when the or each blocking member (33) is in the releasing position.