[en] The wall of the vessel consists of an outer mantle from prestressed concrete, a temperature insulating zone and an inner sealing liner, preferably from steel. According to the invention the temperature insulation zone is free from expansion joints, fits to the concrete mantle and has an insulating capacity much higher than that of the concrete. Preferably there are provided temperature regulating systems as well within the temperature insulating zone as within the concrete mantle. The material of the temperature insulating zone may contain porous ceramic compression resistant admixtures. (P.K.)

[en] Based on results gained with the common project of Reaktorbau Forschungs- und Baugesellschaft (RFB), Oesterreichische Studiengesellschaft fuer Atomenergie (OeSGAE) and industrial partners, 'Prestressed Concrete Reactor Pressure Vessel with Hot Liner and Elevated Wall Temperature' the problem of instrumentation of PCRV at elevated concrete temperature has been investigated. Temperature, strain and stress gauges were selected and tested in a laboratory and in the concrete structure. From the test results possibilities for the measurement of strains and stresses at elevated temperatures were derived. (orig.)

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[en] The main scope of the development and experimental verification of a new type of Prestressed Concrete Pressure Vessel (PCPV) was a significant gain in operational safety and, as a consequence, availability. An analysis of possible disturbances and down-times of conventional PCPV's shows two ways to improve the operational safety: a) to make the working conditions of the liner, the most essential component, safer, thus decreasing the probability of a leak; b) to improve the possibilities for inspection, leak detection and repair, thus reducing shut-down times. The Austrian PCPV offers a solution to these requirements. The main characteristics of the new vessel concept, developed and tested in Austria, are: Elastic hot liner, accessible for inspection and repair; adjustable wall temperature, matching the respective operating conditions of HTR's optimally; leak limitation and detection, controlled leak evacuation

[en] As a contribution to improve further the operational safety of prestressed concrete pressure vessels (PCPV) a concept was developed based on a hot liner in direct contact with coolant. Thus the liner is accessible for inspection, leak detection and repair, leading to an increased availability of the plant. As a further safety consequence the concept calls for a liner which is kept in all operational and emergency conditions under elastic compression well below the yield point. This second requirement is satisfied by using specially suited high strength liner materials in combination with a simple temperature control system adjusting the vessel wall temperature in relation to the liner temperature. In this way the vessel can also be adapted readily to varying working conditions. The principles of the concept are discussed in comparison with other existing or future vessels and design details are given. (U.K.)

[en] A hot liner in direct contact with the coolant has been developed to improve the operational safety of prestressed concrete pressure vessels (PCPV). The liner is accessible for inspection, leak detection and repair, leading to an increased availability of the plant. High strength liner materials combined with a simple temperature control system to adjust the vessel wall temperature in relation to the liner temperature keep the liner in the elastic compression eliminating the danger of plastification. The liner is also an effective control of possible leakages. Comparisons with existing vessels have been made and the experiments to verify the concept are outlined. The PCPV concept can be applied to gas cooled thermal and fast reactors and light and heavy water-cooled reactors. Many shapes are possible including mono-cavern, multicavern and satellite designs and the feasibility studies which have been carried out are discussed. (U.K.)