[en] The study on the natural gas and condensate occurrence in salt, specifically in the salt stock Gorleben-Rambow covers the topics development of salt deposits, salt stocks, crude oil and natural gas, gas and condensate inclusions in evaporite. Experimental data on crude oil borehole studies in Gorleben, natural gas drill holes in the salt stock Rambow, Luechow Z1 - saltstock Wustrow, gas indications, gas occurrences and gas detection are summarized.

[en] Seven different radiobiological dose-response models have been compared with regard to their ability to describe experimental data. The first four models, namely the critical volume, the relative seriality, the inverse tumor and the critical element models are mainly based on cell survival biology. The other three models: the Lyman (Gaussian distribution), the parallel architecture and the Weibull distribution models are semi-empirical and rather based on statistical distributions. The maximum likelihood estimation was used to fit the models to experimental data and the χ"2-distribution, AIC criterion and F-test were applied to compare the goodness-of-fit of the models. The comparison was performed using experimental data for rat spinal cord injury. Both the shape of the dose-response curve and the ability of handling the volume dependence were separately compared for each model. All the models were found to be acceptable in describing the present experimental dataset (p > 0.05). For the white matter necrosis dataset, the Weibull and Lyman models were clearly superior to the other models, whereas for the vascular damage case, the Relative Seriality model seems to have the best performance although the Critical volume, Inverse tumor, Critical element and Parallel architecture models gave similar results. Although the differences between many of the investigated models are rather small, they still may be of importance in indicating the advantages and limitations of each particular model. It appears that most of the models have favorable properties for describing dose-response data, which indicates that they may be suitable to be used in biologically optimized intensity modulated radiation therapy planning, provided a proper estimation of their radiobiological parameters had been performed for every tissue and clinical endpoint

[en] The reflection spectra of film samples Bi₂Te₃-Bi₂Se₃ of n- and p-types without and with annealing in the beam energy interval 1-6 eV incident normally on the surface are measured. The spectra of their optical parameters and values of optical transitions are defined by Kramers-kronig method. It is shown that the character of the spectrum change of optical parameters and electron transition values change with annealing. The study of the influence of annealing on the reflection coefficients of film polycrystalline samples Bi₂Te₃-Bi₂Se₃ of n- and p-type and the spectrum definition of their optical parameters on its base is the task of the given work

[en] Structural characteristics of phase transition in single-domain epitaxial BiFeO₃ films are studied by the Landau-Devonshire theory. It is predicted that remanent polarization shows strong strain dependence for different temperatures while spontaneous polarization is almost independent of strain over a wide temperature (0-500°C). We also obtain the thickness dependence of the c-axis lattice parameter and Curie temperature, and make a comparison between the polarization rotation angle and the angle attributed to the structural evolution in epitaxial (001)_p BiFeO₃ films grown on SrTiO₃ substrates. The theoretical results are in agreement with recent experimental and theoretical data. Our calculations show that the clamping effect should also be taken into account in order to depict the mechanism of the polarization rotation completely. (authors)

[en] Light front form of the relativization of the deuteron wave is considered. Parameters of the wave function are extracted comparing theoretical results with experimental data. Experimental data are obtained on the two-metre propane bubble chamber of JINR (Dubna) bombarded by the deuteron beam with momentum of 4.2 GeV/c/nucleon. (author)

[en] Uncertainty analysis aims at characterizing the errors associated with experimental data and with results of computer codes when applied to the predictions of nuclear power plants related scenarios, in contradistinction with sensitivity analysis, which aims at determining the 'amount of change' in the predictions of codes when one or more input parameters varies within proper ranges of interest. An outline of the features of independent approaches for estimating the uncertainty associated with predictions of system thermal-hydraulic codes is provided. The approach, according to which the uncertainty derives from the comparison between relevant measured data and results of corresponding code calculations, is discussed in details. Within the framework of this approach, the UMAE (Uncertainty Method based on the Accuracy Extrapolation) method has been developed first and, later on, used as virtual engine for the method named Code with capability of Internal Assessment of Uncertainty (CIAU). The principle of UMAE is the consideration of the measure of accuracy as a statistical quantity independent of the scale. On this basis the value of accuracy measured at different scales is also valid at the scale of the Nuclear Power Plant and constitutes the uncertainty. (author)

[en] This paper deals with the 1-D Delayed Equilibrium Model (DEM) for choked or critical flow rate in steady state or quasi-steady state conditions and the selection of the relevant experimental data for assessing such models. In particular, the focus is made on thermodynamic non-equilibrium conditions, which prevail in the flashing process near the critical section. In this regard, relaxation models such as the DEM developed and tested in previous studies at UCL was revisited and improved in view of their implementation in the next CATHARE code generation during the EU NURISP (NUclear Reactor Integrated Software Platform) project. A methodology to implement the DEM into is developed. Some new results of the DEM are compared against experimental data such as Super Moby-Dick experiments done in CEA and the well-known Marviken experiments performed at quasi-real scale geometry of Nuclear Plant. (author)

[en] A condensation induced water hammer is a severe effect that has caused damages and even fatalities worldwide. This effect is not limited to the nuclear industry only. Generally it can occur in every pipe that contains water and steam (two-phase-flow). To date many experiments were executed to study this effect and to validate existing water hammer codes. But theoretically versus measured results show a very high degree of deviation. Information about those experiments was obtained by literature review. This information is presented additionally to a test facility, which has been developed in order to generate water hammers. The test device is introduced in this paper and its main functions are briefly explained. In contrast to other experiments, water hammers at the UniBw are performed under controlled conditions. Air in water is a disruptive parameter that causes vigorous deviations between the theoretical system code and the experimental measurements. As in the test device presented in this paper, deionised water without air is used, this effect is ruled out. Furthermore the inception of a water hammer is controlled by a scientist. The experimental results will characterise the dynamic response of the test device as a function of system pressure, filling degree and sub-cooling. (author)

[en] In this paper the simulation of the tests THAI HD-12 and HD-22 with the flame front model (FRONT) of ASTEC using different approaches for the turbulent burning velocity is treated. Results of the simulations depend on the estimation of the turbulence intensity. Applying only one parameter set, the correlations indicate different behaviours. To show the influence of the turbulence intensity parameter, these were varied and thus, a good agreement to the experiment can be achieved with each correlation. In addition, a recommendation for the models parameter will be given for the actual used correlation according to Peters. (author)

[en] The International OECD/NEA test benchmark for the trip of one of four operating reactor coolant pumps (RCPs) was solved using thermohydraulic code package KORSAR/GP. KORSAR/GP applies 1D calculational units. This benchmark was based on experimental results obtained during commissioning of Kalinin NPP, Unit 3. During the experiments a large amount of experimental data was obtained that enabled us to supplement the validation of the computer codes and nodalizations of 1D thermohydraulic codes. In the given transient there was a difference between coolant temperatures in different loops that resulted in the necessity of numerical simulation of the coolant mixing in the reactor plenums. To solve this problem, complex branched nodalization (i.e. the set of code calculational units) was used. The analysis results matched closely with the experimental data. Thus it was shown that the nodalization developed with the use of KORSAR/GP and the code itself can be applied for the simulation of VVER-1000 transients with one ore more RCPs in operation and sharp difference between coolant temperature in loops. (author)