INSTITUTE OF NUCLEAR RESEARCH AND NUCLEAR ENERGY - BULGARIAN ACADEMY OF SCIENCES

Their core work

INRNE is Bulgaria's primary nuclear physics and energy research institute, operating under the Bulgarian Academy of Sciences. Their core work spans two domains: nuclear reactor safety — particularly severe accident management and VVER reactor technology — and atmospheric sciences including aerosol monitoring, cloud physics, and trace gas measurement. They contribute specialized modeling, simulation, and experimental capabilities to large European research infrastructures and nuclear safety programs, serving as Bulgaria's main node in pan-European observation and reactor safety networks.

What they specialise in

How they've shifted over time

In the early H2020 period (2014-2018), INRNE balanced nuclear safety fundamentals — VVER workforce training, knowledge management, and initial severe accident studies — with entry into atmospheric monitoring via ACTRIS-2. From 2019 onward, both tracks matured: nuclear work shifted from training toward advanced simulation codes (CAMIVVER) and uncertainty quantification in severe accidents (MUSA), while atmospheric research moved from operational science toward building permanent European infrastructure (ACTRIS IMP, ATMO-ACCESS with ERIC and ESFRI milestones). The trajectory is clearly toward deeper computational capabilities in nuclear safety and institutional permanence in atmospheric observation networks.

INRNE is moving from being a participant in research campaigns toward becoming a permanent infrastructure node in both atmospheric sciences (ACTRIS ERIC) and nuclear safety simulation, making them increasingly valuable as a long-term partner rather than a project-by-project contributor.

How they like to work

INRNE operates exclusively as a consortium participant — they have not coordinated any H2020 projects, which is typical for national research institutes in smaller EU member states contributing specialized expertise to large multinational efforts. With 320 unique partners across 37 countries, they work predominantly in large consortia (EUROfusion alone involves hundreds of partners). This broad network suggests they are a reliable, low-friction partner who integrates well into complex multi-institutional projects without demanding leadership overhead.

With 320 consortium partners spread across 37 countries, INRNE has one of the broadest collaborative networks of any Bulgarian research institute. Their connections span Western Europe's major nuclear and atmospheric research labs, giving them deep integration into pan-European research infrastructure programs.

What sets them apart

INRNE occupies a rare dual niche: deep expertise in both nuclear reactor safety and atmospheric sciences, two domains that rarely overlap in a single institute. For VVER-specific work, they are one of few EU partners with direct operational knowledge of Russian-designed reactor technology widely used in Central and Eastern Europe. Their role in ACTRIS gives them access to Europe-wide atmospheric observation data and infrastructure, making them a bridge between nuclear safety and environmental monitoring communities.

Highlights from their portfolio

• EUROfusion
  By far their largest project (EUR 554K, 45% of total funding), representing an 8-year commitment to the European fusion energy roadmap — signals deep, sustained capability in plasma and nuclear physics.
• CAMIVVER
  Their second-largest project (EUR 238K) focused on advanced multiphysics simulation codes for VVER reactors — directly relevant to nuclear safety in countries operating Soviet-era reactor designs.
• ACTRIS IMP
  Part of the transition from project-based atmospheric research to a permanent ESFRI research infrastructure with ERIC legal status — positions INRNE as a long-term node in European atmospheric sciences.