[en] For each individual motional quantity (angle of rotation and lengths of extension respectively rotational and translational motions) there may be achieved a uniform, selectable dynamic control behavior without readjusting the control parameters. The control device may operate with electric, hydraulic, or pneumatic actuators. The output signal of the controller is amplified to the degree that the influence of the variable moment of inertia (rotation) or of the variable mass (translation) will be compensated for. Another compensating system is additively feeding the positioning signal of the motion drives in such manner that the dynamic coupling with other motional quantities will be reproduced. The remaining system to be controlled is a linear system of second order with constant coefficients for each motional quantity. There may therefore be applied control devices like control with backfeeding of state, PID control, or time-optimal control. (DG)

[en] The device for motion damping of a control rod which can be moved longitudinally permits different speeds of movement of the control rod into and out of the core. For this purpose, the axis of the rod carries a hollow cone and, some distance below the base of this cone, a truncated conical ring. Both move in a damping cylinder filled with a fluid and are guided by rollers relative to this cylinder. In upward movements, the flow resistance, because of the streamline shape of the conical surface, is lower than in downward movements. In the downward movement, opposed flows produce turbulences in the channel between the damping cylinder and the cone and in the annular slot formed by the cone and the truncated conical ring. These give rise to an increased pressure drop. In this way, the control rod may be moved into the core very quickly, but its downward movement is slowed down in case of a defect. (DG)

No abstract available

[en] An overview of imaging methods for technological process data and tools for technological component control is presented, with focus on the links between the imaging equipment and the control elements, especially on opportunities for visualization of changes in the parameters controlled. The report includes a description of the graphic tools for a well-arranged and unique representation of the major parameters pointing to emergencies and their comparison with conventional imaging tools. The displays are also assessed with respect to their availability within the hierarchy of the entire system and feasibility of optimisation of their structure. (author)

[en] The description is given of a device for detecting, without any mechanical contact, the position of a mobile component, particularly the control rod of a nuclear reactor, along a given path determined by means of an electromagnetic transducer comprising: (a) a primary winding fed by a current source or alternating voltage to generate an induction flow, (b) a secondary winding inductively connected to the primary winding and fitted with a number of secondary coils spaced out at regular intervals along the path and connected together two by two, the coils of each couple being in phase opposition to form an elemental differential detector, (c) a mobile rod comprising at least one magnetic part for modifying the inductive coupling between the primary and secondary windings when the rod is being moved and so generate a secondary output voltage representing the position of the rod

[en] The invention relates to an improvement of a device for driving a control element of a nuclear reactor with the aim of making this structure simple and compact with a small cross-section dimension. The device has a rack connected with the control element and a conversion gear actuated by an electric motor. A drive pinion mounted on a rotatable arm is pivotable between a position not meshing with the rack and an engaging position fixed by a solenoid. According to the invention, electric motor and solenoid are mounted coaxially with the rack, and the axially displaceable core of the electric magnet is connected with the arm by a hinged rod. (UWI)

[en] The present article has for aim to detail the stakes of the nuclear rebirth which the command-control faces: to master the technological evolutions, to bring a strong response to the problematics of qualification and reliability more sensitive by the passage to numerical and to answer the needs of renovation of existing nuclear power plants. The Areva reply to these stakes is specified. (N.C.)

No abstract available

No abstract available

[en] These notes are devoted to the problems of linearization, observability, and decoupling of nonlinear control systems. Together with notes of Bronislaw Jakubczyk in the same volume, they form an introduction to geometric methods in nonlinear control theory. In the first part we discuss equivalence of control systems. We consider various aspects of the problem: state-space and feedback equivalence, local and global equivalence, equivalence to linear and partially linear systems. In the second part we present the notion of observability and give a geometric rank condition for local observability and an algebraic characterization of local observability. We discuss uniform observability, decompositions of non-observable systems, and properties of generic observable systems. In the third part we introduce the notion of invariant distributions and discuss disturbance decoupling and input-output decoupling. Many concepts and results are illustrated with examples. (author)