[en] An outline of the procedures and schedules developed for preventive maintenance in power stations within the Rheinisch-Westfaelisches Elektrizitaetswerk (RWE) is presented. After an introduction of maintenance in general the different kinds of preventive maintenance activities are described. This includes also the prerequisite identification systems. The aims of preventive maintenance and the measures are explained that have to be taken, if these aims are to be achieved. A number of examples from actual practice are cited. (orig.)

[en] Remote manipulation means the application of multi-purpose devices featuring high mobility and universal applicability. The paper describes such a remote manipulation system (manipulation vehicle MF1 and MF2, master-slave manipulator, TFTR maintenance manipulator) which can be used flexibly in the NNP during maintenance and repair and in incident and accident situations. Connecting elements and tools can be redesigned for remote manipulation to meet the specific application environments. (DG)

[en] A robot developed by the company ACEC is described. Its main objective is to replace man during tasks being carried out in radioactive, dangerous or unhealthy environments

[en] This paper describes a practical and cost effective method for applying Reliability Centered Maintenance (RCM) principles to improve the effectiveness of an existing Preventive Maintenance program. While this program was developed for a modern nuclear power plant, it is based on the premise that many plants already have effective Maintenance and PM Programs, some of which may be relatively comprehensive, even at non-nuclear facilities. Therefore, the objective of this type of upgrade project is to identify and select the most effective PM tasks, whether currently active, or recommended new tasks or revisions, and to eliminate ineffective tasks. Then, apply those changes within the existing programs in a way that will allow the most efficient allocation of resources. It is anticipated that this program will enhance plant safety, improve plant availability and the reliability of plant equipment, as well as prevent escalation of maintenance costs when fully implemented

[en] In Petten the Nuclear Structure Group uses neutron radiative capture as a tool for the study of bound and unbound states. Neutron rich nuclei provide a testing ground for physical theories and are relevant for nuclear applications. Moreover, neutron beams do not heat the target and therefore work with polarized target nuclei is feasible. In this paper: a slightly modified text of a video presentation: it will be shown how replacement of the reactor vessel was involving our group

[en] Maintenance strategies can be assigned to one of three categories: failure maintenance, periodic maintenance or condition-oriented maintenance. The optimum maintenance scheme can be selected on the basis of a cost-benefit analysis but the safety of life and limb or the political climate for NPP can hardly expressed in numbers. The implementation of preventive maintenance needs two preconditions: high-performance instrumentation in the form of stationary and mobile monitoring systems for the determination of the condition of the nuclear power plant components and provision of a tool that can handle both the organization of the work and the evaluation of the results obtained. (authors)

[en] NEK management has undertaken a set of actions to improve the ability to provide equipment, spare parts and material needed to support operation and maintenance of the Krsko plant. These actions are necessary due primarily to the fact that NEK is more and more confronted (increasing trend) with the issue that suppliers of safety-related equipment and spare parts have decided not to pursue the nuclear portion of their business, incl. specific QA systems and qualifications. The purchase orders imposing these requirements are no longer accepted. In order to continue to obtain the necessary materials at the required quality level, a 'Commercial Grade Item' (CGI) procurement and dedication program has been developed based on similar practices in USA. (author)

[en] This invention concerns the handling of large size long pieces and particularly gudgeon bolts employed for securing the closures of nuclear reactor vessels. This device enables the gudgeon to be moved vertically and pivoted into a horizontal position and vice versa. It includes a pivoting arm that can tilt about a fixed axis and used to guide a mobile trolley that can move along this arm and fitted with supports for the lower part of the gudgeon bolt. At least one cable includes one end fixed to the mobile trolley, the other end cooperating with a fixed winch. The preferably single cable passes over a loose pulley integral with the arm. In this manner, by actuating the winch and simply acting on this cable, it is possible to obtain the vertical displacement of the gudgeon bolt and its pivoting into the horizontal position and vice versa at one and the same time

[en] The application of predictive maintenance techniques to nuclear valves is emerging with the use of more powerful diagnostic tools and the systematic analysis and feedback of experience. As advances continue, gains in valve maintenance efficiency will provide significant reductions in dose exposure, maintenance costs and plant unavailability. (author)

[en] The target of the paper is to turn the attention of the specialists into several directions connected with the NPP outage. The first direction is connected with the outage contribution to the NPP safety. The second one is connected with the way of thinking and the approaches used for the analysis and planning of the maintenance activities during the outage. The third one is connected with the knowledge and practice which can be used for scientific basis of the NPP safety during outage. The knowledge and experience in this field can be used in the other branches of the industry, where the requirements to reliability and safety are high