ŠKODA JS a.s. provides its customers with calculation analyses defined based on the current needs of nuclear power plants resulting from safety and service requirements.

We focus not only on reactor component calculations, but also calculations related to other operational units of nuclear power plants. The responsibility of the Calculations Department is to perform comprehensive, multidisciplinary calculation analyses. To successfully accomplish this goal, we develop calculation analyses in four main areas – strength and lifetime calculations, thermo-hydraulic calculations, radiation safety-related calculations, and last but not least, reactor physics calculations. These areas also correspond with the structure of the individual calculation departments at ŠKODA JS a.s. These departments actively communicate with one another and thus create a multidisciplinary, comprehensive insight into the problems they deal with.

Currently, the Calculations Department is significantly involved in the preparation of licensing documentation for the introduction of new types of nuclear fuel at Czech nuclear power plants operated by ČEZ, a.s. In order to be able to capture the issues of multi-physical phenomena that need to be evaluated in such analyses and to determine whether the operation of nuclear reactors with a given type of nuclear fuel will be within the safe margin of operating limits and conditions, it is necessary to actively develop sophisticated computational tools. These computational tools also need to be validated on real experimental data. And it is the development and maintenance of software tools that are actively used in computational analyses that is one of the key activities of the Calculations Department. The developed software tools are continuously validated and undergo an approval process with the State Nuclear Safety Authority. They are subsequently used by ŠKODA JS a.s. employees and are also supplied for use, for example, at the Dukovany NPP for the needs of colleagues from the departments responsible for the nuclear power plant’s fuel cycle. Thanks to our detailed knowledge of the inner structure of our SW products and the historical development, we are able to introduce new global knowledge of science and technology into current industrial practice.

However, the Calculations Department does not only use its own software, but also commercial codes, so that it is able to process a wide range of analyses and to respond to the current demand of our business partners, and at the same time to ensure constant computational support for other departments of all ŠKODA JS a.s.´ divisions.

Significant milestones in our recent history

termohydraulické výpočty - rychlostní pole

1994-2014Licensing of the SCORPIO reactor core surveillance system with the neutron physics and thermal hydraulics module by the ŠKODA Company

First implementation of the SCORPIO system at the Bohunice NPP

Commencement of cooperation on the optimization of VVER reactor fuel charge

výpočty - zatížení vnitřního koše kontejneru

1999-2014Preparation of data for the pre-operational safety inspection and report at the Temelín NPP

Launch of technical support for the Dukovany NPP in the sense of periodically recurring activities

Dukovany NPP pre-operational safety report for first-generation GD fuel

výpočty - výstup programu COSMOS

1999-2014Modernization of the SCORPIO system at the Dukovany and Bohunice NPPs

Launch of developmental activities under the umbrella term “NPP fuel cycle optimization”

Preparing data for the pre-operational safety report for the Temelín NPP operating at an increased 104% of its power output


1999-2014Calculations for radiological implications of hypothetical accidents at the Dukovany and Temelín NPPs

Beginning of cooperation with EDU on the periodic activity “Operational Support in Designing Fuel Charges”

Beginning of cooperation with the Temelín NPP on the periodic activity “Operational Support for the Temelín NPP”


2012-2016A general contract concluded with EDU entitled “Effective Control of the Core Section of the Fuel Cycle at the Dukovany NPP”


2014-2017Conclusion of a general agreement on the development of cooperation with ČEZ entitled “Fuel Cycle Development and Meeting Operational Needs of Reactors Operated by ČEZ”


2015-2018Provision of support in preparing the pre-operational safety report for TVSA-T mod.2 fuel


2015-2019Preparing calculation documentation for the purpose of licensing the ŠKODA 1000/19, ŠKODA 1000/19M and ŠKODA 440/84 casks