The article is titled “The symbol of the serpent in the Apocalypse of St. John”. Its aim is an exegetical analysis of the term “serpent” (ὄφις). The expression appears in Rev 9:19; 12:9; 20:2 and 12:14-16. In Rev 9:19 snakes are a symbolic element of a cavalry that realizes God’s plan. In other texts the serpent is a symbol of Satan. In Rev 12:9; 20,2 appears the title “the ancient serpent” referring to the biblical story of Gen 3:1-24. It is emphasized that Satan is the tempter. In Rev 12:14-16 the term “serpent” is used as a synonym for the dragon. It is possible that the symbolic scene of aggression towards woman expresses a destructive satanic action against the Church. We also ask a question how much the apocalyptic dragon (δράκων) is a serpent. In the course of exegetical analysis we have paid attention to two perspectives. The first is a historical and religious background of the serpent symbol in Rev. The second is original theology of Rev. One of her basic features is very rich symbolism. The author of Rev. refers to the past, but introduces a new, original content.

The paper presents a neutronic analysis of the battery-type 20 MWth high-temperature gas cooled reactor. The developed reactor model is based on the publicly available data being an ‘early design’ variant of the U-battery. The investigated core is a battery type small modular reactor, graphite moderated, uranium fueled, prismatic, helium cooled high-temperature gas cooled reactor with graphite reflector. The two core alternative designs were investigated. The first has a central reflector and 30×4 prismatic fuel blocks and the second has no central reflector and 37×4 blocks. The SERPENT Monte Carlo reactor physics computer code, with ENDF and JEFF nuclear data libraries, was applied. Several nuclear design static criticality calculations were performed and compared with available reference results. The analysis covered the single assembly models and full core simulations for two geometry models: homogenous and heterogenous (explicit). A sensitivity analysis of the reflector graphite density was performed. An acceptable agreement between calculations and reference design was obtained. All calculations were performed for the fresh core state.

The paper presents the core design, model development and results of the neutron transport simulations of the large Pressurized Water Reactor based on the AP1000 design.The SERPENT 2.1.29 Monte Carlo reactor physics computer code with ENDF/BVII and JEFF3.1.1 nuclear data libraries was applied. The full-core 3D models were developed according to the available Design Control Documentation and the literature. Criticality simulations were performed for the core at the Beginning of Life state for Cold Shutdown, Hot Zero Power and Full Power conditions. Selected core parameters were investigated and compared with the design data: effective multiplication factors, boron concentrations, control rod worth, reactivity coefficients and radial power distributions. Acceptable agreement between design data and simulations was obtained, confirming the validity of the model and applied methodology.