Network of Nuclear Engineering
and Energy Services

NNEES (Network of Nuclear Engineering and Energy Services) represents a global partnership of highly qualified experts in the area of the nuclear safety and energy use and applications.

Its mission is to support a broad range of institutes including the regulatory authorities, nuclear and energy industrial facilities, design, engineering and research organizations and universities and cooperate with them in various scientific and technical projects including the design, construction and engineering services, consultancy, independent review and assessment, education and training and knowledge management.

In more specific detail the NNEES focuses its efforts on the following aspects:

  • Safety assessment of the nuclear facilities and installations
  • Computer code simulations of nuclear facilities and installations’ transients and accidents conditions
  • Verification and validation of computer codes and computer code models
  • Education and training including the guidance and review of master and PhD thesis
  • Drafting, preparation and independent review of the licensing documentation including the regulations and guides


Independent review of the safety related documentation

Drafting and/or review of regulatory guides

Thermal-hydraulics calculations

Neutron-kinetics calculations

Containment analysis

Radiological analysis



Several periodic (see links on the right side for more detail) and ad-hoc trainings are organized and co-organized by NNEES. If you are interested in participation or have any question, contact us at info@nnees.sk.

Upcoming trainings:

  • NRSHOT: 18–22.3.2019, Lucca, Italy

  • SUNBEAM: 01–12.7.2019, Vienna, Austria

  • Zwentendorf Plant walk-Down: 13-16.5 and 23-26.9, 2019, Zwentendorf NPP, Austria

  • MMARS: 04–08.11.2019, Lucca, Italy


NNEES collaborates with broad range of international organizations including nuclear regulators, industry, R&D institutes and universities supporting their activities with top experience in the area of deterministic and probabilistic safety assessment, licensing of nuclear installations, computer code calculations, computer code verification and validation, code models qualification and  development of tailored training programs.


FONESYS  – Forum and Network of System Thermal-Hydraulic codes in Nuclear Reactor Safety – established in 2010, brings together computer codes developers for discussing envisaged improvements in system thermal hydraulics, promoting cooperation aimed at the code improvements and their application in licensing process and safety analysis.

NNEES serves as a FONESYS secretariat taking care of legal and organizational aspects of the forum.

FONESYS members meet regularly once a year.

Members of FONESYS are (in alphabetical order):


Contact Form:

Contact Informations:

  • NNEES, k.s.

    Zvončín 299

    919 01 Zvončín


  • +421 948 032 931