[en] The heat exchanger tubes of the fast breeder cooled with sodium are collected in bundles and are braced with a longitudinal series of grids. The grids are supported elastically on a central core of the tube bundle. The supports permit a relative displacement of groups of heat exchanger tubes relative to each other and to the core, which means that linear thermal expansion can be accommodated. The supports consist of forked brackets, which are arranged at the grids and at the core and grip into one another. (RW)

[en] Elastic mounting of tube spacers in a heat exchanger for a LMFBR type reactor

[en] A tube-in-shell heat exchanger is described for use in liquid metal cooled fast breeder reactor constructions. The system consists of a bundle of heat exchange tubes with a central spine extending longitudinally through the shell and a series of longitudinally spaced transverse grids resiliently mounted on the central spine within the shell to provide transverse support for bracing the tubes apart. (U.K.)

[en] A nuclear reactor is a liquid metal cooled fast breeder and has a primary vessel with an upper cylindrical portion and a lower hemispherical portion. A tank contains liquid metal and has a wall connected at its lower end to the lower portion. A hemispherical guard vessel is spaced from the portion and the floor of concrete vault and is connected to the primary vessel at the bottom end of the upper portion. The guard vessel provides a means of containing and detecting any leakage from that part of the primary vessel which is exposed to liquid metal. (author)

No abstract available

[en] This paper describes the monitoring equipment used in detecting and locating fuel failures in the Prototype Fast Reactor at Dounreay, Scotland. The system operates by detecting delayed neutrons in coolant samples which are taken at the core outlet and the primary heat exchangers. A subsidiary system is used for monitoring fission product gas release which is accumulated in the reactor gas blanket or transported in the core outlet coolant samples. (author)

[en] For fast reactors it is necessary that both high safety standards and low generating costs are achieved for the introduction of commercial plants. The approaches to ensuring and assuring high integrity for the safety related structures are presented, and it is shown how this can be achieved while avoiding undue cost penalties. This is done with reference to the CDFR design. (U.K.)

[en] The design work on the European Fast Reactor (EFR) started in the spring of 1988 at the request of the EFR Utilities Group (EFRUG), which comprises electricity producing utilities from France, Germany, Great Britain, and Italy. Other European utilities have expressed their interest in joining the EFR project. The EFR design work is being performed by EFR Associates, a group of design and construction companies that includes: (1) Novatome, a division of Framatome, France; (2) NNC, a member of the GEC group of companies, Great Britain; and (3) Siemens Engineerzeugung KWU, Germany. A first consistent design of a nuclear island for the EFR as submitted to EFRUG in the spring of 1990. This design combines the best features from previous national designs (SPX2, SNR2, and CDFR). Since 1990, the design validation work has been in an advanced stage, and EFR Associates proposal for the main features of a consistent design, which was presented to EFRUG in autumn 1991 (mid-phase 2), represented an important milestone in the design phase of the project

[en] A passive thermal barrier which stagnates sodium, is proposed for a liquid metal fast breeder reactor (LMFBR). To validate the design, a program of work is outlined. This program involves the development of computer programs and experimental simulations addressed at natural convection heat transfer in closed and permeable cavity systems

[en] In 1988 the utilities, R and D organizations and design and construction companies joined in the European Fast Reactor (EFR) Programme. During a five year period, a concept design combining the best features from previous national projects and incorporating innovative features, will be developed and validated. Progress made so far and the main achievements which have been obtained are described and the strategy towards achieving competitiveness is given. (author)