No abstract available

[en] The speed of flow of the sodium is measured in two closely adjacent flow crossections using pairs of electrodes in the field of two disc-shaped permanent magnets made of AlNiCo 450, by means of measurements of running time of speed fluctuations. The result of the measurement is independent of the temperature of the sensor and the temperature of the sodium. The same arrangement makes it possible to determine the proportion by volume of the fission gas in sodium with a limiting freequency of several kHz. (DG)

[en] The magnetic probe immersed in the liquid metal flow (sodium) produces two voltages in two predetermined volumes on the Faraday induction principle, which are taken to two amplifiers. There is a correlator for determining the cross correlation function and the transport period. The outputs of the amplifiers are switched to a measuring instrument which responds quickly to determine the gas volume. The magnetic probe itself consists of a tube closed at one end, which is concentrically mounted in a jacket tube, and forms an annulus with this, through which the liquid metal flows. There are two disc-shaped permanent magnets made, for example, of AlNiCo 450 at a certain spacing from each other in the magnetic probe, and there are two pairs of electrodes associated with them. These give the voltage signals for the amplifiers. The material of the probes and the jacket tube is V2A. (HP)

[en] For the study of transverse electric dipole excitations in the nucleus ⁹⁰Zr with high-resolution inelastic electron scattering ten spectra in the excitation energy range Esub(x) = 9.4 MeV to 13.1 MeV at incident energies between E₀ = 30 MeV and 60 MeV were taken up under scattering anlges of theta = 93⁰, 129⁰, and 165⁰. The analysis of the cross sections was performed in DWBA under application of RPA amplitudes which were obtained in the framework of a separable residual interaction model. The existence of theoretically expected transverse E1 excitations could be detected with large probability, however an interpretation of the E1 transitions in terms of a fine structure of the giant electric dipole resonance cannot be excluded. For the studied excitation energy range a summarized transition strength of ΣB(E1,k)up = 0.81 (+0.74-0.38) e²fm² results. A remarkable E2 trength (2.4% EWSR) was observed in terms of a fine structure below Esub(x) < or approx. 11 MeV. For the magnetic quadrupole strength possible in the whole excitation energy range an upper limit of ΣB(M2,k)up <= 970 μsub(N)²fm² results. In the nucleus ²⁰⁸Pb the form factor of the Jsup(π) = 1⁺ state at Esub(x) = 5.846 MeV was studied. The strength of the transitions amounts to B(M1,k)up = 0.94 (+0.55-0.12) μsub(N)². (orig./HSI)

[en] In this paper details of the design and operation of an unique liquid metal flow meter probe are presented. Small permanent magnets are employed in the device. Flow rate measurements involve especially determination of the transit time for natural velocity fluctuations using a double-magnet configuration. Experiments have shown, that the used AlNiCo 450-permanentmagnets performed successfully for long times (10,000 h) at elevated temperatures (600⁰C). Flow meters have been employed in different test loops. They will be installed also in the BR2- and KNK II-reactors. The performance of a miniatur probe (2 mm diam.) and application of the device for the determination of the void fraction in a Na-inert gas stream are also presented. (orig.)

[en] An X-Ray-equipment is described which has been selected and assembled for the recording of fuel rod simulator-deformations during a loss of coolant accident using a movie technique. With this method it is possible to observe and record the ballooning of the simulator under conditions similar to those in a reactor. Some typical pictures are shown which show that the quality is high enough to allow a quantitative evaluation of the ballooning as a function of time. (orig.)

No abstract available

[en] A slice-selective saturation technique (FROGS), as well as a slice- and a volume-selective excitation technique (ISIS) were implemented on a whole-bod6y 1.5-T MR scanner. Electrocardiogram-triggered P-31 cardiac spectra of normal adult volunteers were acquired using the different localization techniques with a highly sensitive surface coil in the transmit/receive mode. Once a slice was chosen using slice-selective techniques, the geometric sensitivity of the surface coil was used to further restrict the region of interest. The results are discussed with regard to criteria for clinical applicability, efficacy of spatial localization; reproducibility; and tolerance for unavoidable errors in instrument settings

[en] The results of the 'Geophysical Investigation Programme Northern Switzerland' complement the Nagra drilling programme and have provided a three-dimensional structural model of northern Switzerland which corroborates the existence of the west-east extending Permocarboniferous Trough. The exploratory drillings and seismic surveys made up to now show clearly the heterogeneity and complexity of the basement socle

[en] The conversion of a measured signal amplitude from eddy current testing to the true crack dimensions of natural surface cracks is known to be very difficult on account of the complex relationships existing. Therefore, an approach is described here for plotting calibration curves via fracture of some specimen cracks caused in the wall of a tubular specimen as a result of fatigue loading. All boundary conditions which exert an influence on the signal amplitude, such as probes and operating data, material, but also the modes of specimen loading, have to be kept constant. (orig.)