Hydraulic control rod drive for water-cooled nuclear reactors, in particular heating reactors

摘要

Hydraulic control rod drive (CD) for water-cooled nuclear reactors, in particular heating reactors, with a reactor pressure vessel (1) and with a reactor core (5) stored therein, consisting of a fuel element field (50) in a standing arrangement and in spaces between the fuel elements (5.1,5.2) in or control rods (6) which are retractable or extendable counter to the direction of gravity, drive rods (6.2) of the control rods (6) being provided with hydraulic piston-cylinder systems, to which the cooling water can be supplied from below as working fluid via reactor-internal fluid lines (10) , with the cooling water reservoir (KW) serving as a hydraulic drain. Preferably, at least two external fluid pumps (12) influence the amount of fluid via a control valve arrangement (11) arranged on the outside of the reactor pressure vessel (1) for the purpose of adjusting the control rods (6) in the direction of "lifting" or "lowering" or else to hold the control rod position assumed. For each control rod (6), holding branches (A), lifting branches (B) and lowering branches (C) are provided, with means being provided, when a lifting valve (H) is stuck in one of the lifting branches (A) in its open position, the lowering valve ( SV) in the associated lowering branch (B) and / or to close a second lifting valve in line with the faulty lifting valve (H). Preferably, an upstream main lifting valve of a plurality of secondary switching valves assigned to each individual control rod is combined and in particular combined with a swirl chamber valve or designed as a swirl throttle.