The paper presents the results of a computational analysis of the OECD/NEA benchmark conducted to estimate the accuracy of the critical safety parameters of multiplying MOX-fueled systems. The computational test is a set of 15 spherical multiplying systems that differ in their compositions and geometries. According to the test conditions, the keff values of the analyzed systems are unknown in advance. As part of the computational analysis of the test involving national codes and nuclear data libraries, along with the keff calculations, it is also necessary to estimate the a priori (due to the accuracy of the nuclear data used) and a posteriori (based on the accumulated experimental information) errors in the calculated keff values. Based on the benchmark, an updated version of the ROSFOND/ABBN-RF nuclear data was tested. The results of estimating the a priori and a posteriori errors in keff using the INDECS system for the proposed test models are presented. The analysis of the calculated data shows that (1) the observed spread in the keff values obtained from the Russian ROSFOND library and foreign evaluated nuclear data libraries (ENDF/B-VII.0, JEFF-3.2, JENDL-4.0) varies from –0.3 up to 0.8%; and (2) the deviation of the calculation results in the keff values obtained from the ROSFOND library and its group version, ABBN-RF, does not exceed 0.1%. The average a priori error in keff for all the tested options of multiplying systems is about 1% and, taking into account the selected set of experimental criticality data for MOX-fueled systems, including experiments at the BFS facilities, the average a posteriori error in keff can be reduced to 0.3%. The performed estimations confirm the high accuracy of the ROSFOND/ABBN-RF nuclear data for calculating the critical safety parameters of multiplying MOX-fueled systems.

И з в е с т и я в у з о в • Я д е р н а я э н е р г е т и к а • № 2 • 2 0 1 4 109

The paper presents the results of a computational analysis of the benchmark OECD/NEA test to assess the accuracy of critical safety parameters of multiplying MOX fueled systems. The computational test is a set of 15 spherical multiplying systems that differ in composition and geometry characteristics. According to the test conditions, the k eff values of the analyzed systems are unknown in advance. As part of the computational analysis of the test, using national codes and nuclear data libraries, along with the calculation of k eff , it is also necessary to estimate the a priori (due to the accuracy of the nuclear data used) and a posteriori (taking into account the accumulated experimental information) k eff calculation errors. Based on the benchmark test, an updated version of the ROSFOND/ABBN RF nuclear data was tested. The results of estimating the a priori and a posteriori errors in k eff , using the INDEX system for the proposed test models, are presented. The analysis of the calculation data shows that (1) the observed spread in the k eff values obtained using the Russian ROSFOND library and foreign evaluated nuclear data libraries (ENDF/B VII.0, JEFF 3.2, JENDL 4.0) varies from -0.3 up to 0.8%; and (2) the deviation of the calculation results in the k eff values, obtained by the ROSFOND library and its group version, ABBN RF, does not exceed 0.1%. The average a priori uncertainty in k eff for all the tested variants of multiplying systems is about 1% and, taking into account the selected set of experimental criticality data for MOX fueled systems, including experiments at the BFS facilities, the average a posteriori uncertainties in k eff can be reduced to 0.3%. The performed evaluations confirm the high accuracy of the ROSFOND/ABBN nuclear data for calculating the critical safety parameters of multiplying MOX fueled systems.

И з в е с т и я в у з о в • Я д е р н а я э н е р г е т и к а • № 2 • 2 0 1 4 99

The research work considers the development of a technology for processing secondary raw materials of winemaking, which, due to preliminary preparation, passes into the category of enriched high-quality environmentally friendly grape raw materials. This study is carried out with the aim of obtaining concentrated high-quality polyphenolic biologically active extracts that can be used as a functional raw biomaterial for a wide range of products: healthy/sports nutrition, medical and preventive cosmetics, alcoholic and nonalcoholic drinks, and other types of special functional additives. The novelty of the development lies in the fact that at the initial stage, the enrichment of raw materials with target polyphenolic compounds is carried out using effective supercritical fluid CO2 extraction, followed by the use of the obtained AGP** extracts in the form of a finished product - a phytopreparation with inherent functional properties.