N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/105661/PDF/12_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/105661 PY - 2017 IS - No 4 EP - 227 DO - 10.1515/aoter-2017-0032 KW - HTGR KW - HTR KW - Monte Carlo KW - serpent KW - U-battery KW - SMR KW - battery type A1 - Grodzki, Marcin A1 - Darnowski, Piotr A1 - Niewiński, Grzegorz PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2017 T1 - Monte Carlo Analysis of the Battery-Type High Temperature Gas Cooled Reactor SP - 209 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/105661 T2 - Archives of Thermodynamics