“ENPRO CONSULT” Ltd. is one of the leading Bulgarian engineering companies with significant experience in the field of energy technologies. Established in 1998, the company has earned a reputation as a reliable partner, whose services are an example of competence and high quality.

“ENPRO CONSULT” Ltd. provides a variety of services – consulting, design and engineering, supplies and maintenance of operations in various branches of the energy sector: thermal power plants, nuclear power plants, pipeline networks and pumping stations, water treatment and purification systems, nuclear and radiation safety and environmental protection, decommissioning of nuclear power plants, extension of the operational life of energy facilities.

ENPRO CONSULT employees are very familiar with Bulgarian regulatory requirements in the field of nuclear energy use, protection from ionizing radiation and environmental protection, as well as IAEA standards and guidelines and documents of a number of international organizations such as ENSREG, WENRA and NEA OECD. Russian and American regulatory documents in the field of nuclear safety and standards and requirements for designing equipment for nuclear power plants are used and known.

The company can perform independent design and engineering developments and analyses, and also perform expertise on design and licensing documentation.

The company’s structure allows for flexibility and optimal efficiency in the implementation of specific projects. In addition to its permanent staff, the company can form dynamic teams to perform various tasks in its field of activity by attracting highly qualified external specialists.

The company’s quality management system has certificate No. TRBA 100 0591 according to the standard EN ISO 9001:2015 by TÜV Rheinland-Bulgaria EOOD. The quality management system meets the requirements of the IAEA Safety Standards applicable to nuclear power plants.

The leading associates of the company are highly qualified specialists in the fields of: nuclear power plant technology, thermal physics, thermal and nuclear power, industrial thermal engineering, applied mathematics, programming, instrumentation and control, automation and telemechanics. Many of our specialists have received additional qualifications at leading universities and companies from the USA, Finland, Spain, Italy, Russia, Ukraine, etc. The company also employs many young specialists, some of whom were its graduates and doctoral students.

Accumulated experience and capabilities in the field of production technology and safety of nuclear and energy, radiation protection, radioactive waste management and in the field of conventional energy

Building on the experience accumulated by its leading specialists since the early 1970s, over the years of its existence ENPRO CONSULT has developed in the following main areas:

1. Analysis and assessment of safety in nuclear power plants with VVER, including reactor installations of generation III and III+: with modern passive safety systems (such as AES 91, AES 92, AES 2006, AES MIR)
   • Thermohydraulic analyses of transient and emergency modes for all design states of the nuclear power unit; development, optimization and validation of models used in simulators, including severe accidents;
   • Modeling and conducting analyses of transient and emergency regimes for all operational states of VVER-440 and VVER-1000 units, including full implementation of the analyses included in the Chapter “Accident Analysis” of the Safety Justification Report (analysis of the state of the core, analysis of the behavior of the containment, determination of the source and composition of the radioactive discharge outside the containment, assessment of the radiological consequences for the population and the environment), in accordance with national and international standards and laws;
   • Analysis of transient and emergency regimes and justification of proposals for modernization and safety enhancement of nuclear power units;
   • Analysis of transient and emergency regimes and preparation of proposals for the purpose of extending the operational resource of nuclear power units;
   • Analyses of processes in the containment areas of NPPs in the event of severe accidents and preparation of tasks for the design of severe accident management systems for units with VVER-440 and VVER-1000;
   • Supporting analyses in the development of emergency instructions and manuals for the management of severe accidents;
   • Analysis of the radiological consequences of design basis and beyond design basis accidents, support in the preparation of emergency plans.
   • Analyses of the nuclear fuel cycle, including subcriticality in active areas and during transportation and storage of nuclear fuel.
   • Assessment and design of radiation protection when working in an environment with ionizing radiation.
2. Design and engineering of technological systems for nuclear and conventional power plants:
   • High-energy pipelines for water and steam under high pressure, including pipelines of the first NPP circuit;
   • Stress analysis for static and dynamic loads and temperature gradients;
   • Static loads on pipelines of classes 1-4 (conventional power plants) and 1-3 (nuclear power plants);
   • Dynamic loads from internal and external sources;
   • Fatigue and residual resource assessment of pipelines and equipment
   • Design of severe accident management systems (pressure reduction systems, filter ventilation systems, etc.).
3. System analyses and other types of analyses:
   • Development and updating of Nuclear Power Plant Safety Justification Reports;
   • Analyses and assessments of systems and equipment, including mechanical analyses of pipelines and systems of the primary and secondary circuits, reactor vessels and internal vessel devices;
   • Analysis of seismic effects on pipelines and equipment;
   • Analysis of the effects of internal initiating events (rupture of high-energy pipelines, thermal shock at high pressure, etc.);
   • Classification and qualification of equipment;
   • Analysis and design of technological systems (heating, ventilation and air conditioning);
   • Programs for monitoring the condition of reactor vessels;
   • Preparation of procedures for measuring the density of hermozones.
4. Measurement and control systems:
   • Pre-design studies, design and commissioning of I&C systems and process control equipment in nuclear and conventional;
   • Implementation of diagnostic systems and control systems for technological processes in NPPs, as well as systems for early detection of leaks (leak before rupture);
   • Analyses of existing I&C systems;.
   • Analysis and qualification of systems in terms of seismicity and working environment.
5. Activities in the design and management of decommissioning and radioactive waste management;
6. Development of regulatory documents in the field of nuclear power plant safety
7. Licensing activities.
8. Consulting services and project management.

Specific and extensive experience in projects related to the planning and implementation of new nuclear facilities, including nuclear power plants:

• Selection and licensing of sites for nuclear facilities
• Study and infrastructure of sites for nuclear facilities
• Analyses and design related to new nuclear facilities
• Consultations of potential investors in nuclear facilities

Cooperation with Bulgarian and foreign companies

ENPRO Consult has worked as a subcontractor or in cooperation with leading Western companies such as Westinghouse and AREVA, and also has a number of successful joint projects with EQE Bulgaria, EnergoService, IINAE BAS.

The company has a long-standing scientific and technical cooperation with the German GRS, in which the programs ATHLET, ATHLET-CD, COCOSYS and SUSA are developed.

Participation of ENPRO CONSULT specialists in IAEA activities and other research projects

1. IAEA projects
   • Safety assessment of VVER-440/213 (reference unit Bohunice V2 NPP, Slovakia)
   • Development of a severe accident simulator based on the MELCOR program (reference unit Bohunice V2 NPP, Slovakia)
   • Safety assessment of VVER-1000 (reference unit 5 at Zaporizhia NPP)
   • CRP J4.20.04 “Assessment of the Interfaces between Neutronic, Thermal-Hydraulic, Structural and Radiological Aspects in Accident Analysis”
   • CRP J7.20.05 “Evaluation of Uncertainties in Best Estimate Accident Analysis”
2. Development of IAEA lectures and training courses
   • Fundamentals of NPP technology with VVER1000/320
   • Analysis of severe accidents with the MELCOR program (Beijing, China)
   • Application of the RELAP5/3, SCDAP/RELAP and MELCOR programs for analysis of design basis and beyond design basis accidents (Mexico)
3. Participation in other international research projects
   • OECD/NEA VVER-1000 Coolant Transient Benchmark project (rupture of the main steam pipeline of VVER-1000)
   • BMU “Scientific-Technical Co-operation with Middle and East European Countries” project – Germany

ENPRO CONSULT’s capabilities to perform supporting activities

1. Providing technical consultations related to the systems of VVER units and their operational characteristics and verifying their compliance with the requirements of the Bulgarian, European and IAEA safety requirements.
2. Participation in the preparation and verification of safety justification reports related to the construction and modernization of units at NPPs in accordance with the Law on the Use of Atomic Energy and the NRA Regulations.
3. Technical and expert assistance in interpreting Bulgarian and Russian regulatory requirements and standards for design in nuclear and conventional energy facilities.
4. Translation of technical documentation from Bulgarian or Russian into English.
5. Translation of documentation from English into Bulgarian, as well as from Bulgarian into English.

“ENPRO CONSULT” Ltd. is one of the leading Bulgarian engineering companies with significant experience in the field of energy technologies. Established in 1998, the company has earned a reputation as a reliable partner, whose services are an example of competence and high quality.

“ENPRO CONSULT” Ltd. provides a variety of services – consulting, design and engineering, supplies and maintenance of operations in various branches of the energy sector: thermal power plants, nuclear power plants, pipeline networks and pumping stations, water treatment and purification systems, nuclear and radiation safety and environmental protection, decommissioning of nuclear power plants, extension of the operational life of energy facilities.

ENPRO CONSULT employees are very familiar with Bulgarian regulatory requirements in the field of nuclear energy use, protection from ionizing radiation and environmental protection, as well as IAEA standards and guidelines and documents of a number of international organizations such as ENSREG, WENRA and NEA OECD. Russian and American regulatory documents in the field of nuclear safety and standards and requirements for designing equipment for nuclear power plants are used and known.

The company can perform independent design and engineering developments and analyses, and also perform expertise on design and licensing documentation.

The company’s structure allows for flexibility and optimal efficiency in the implementation of specific projects. In addition to its permanent staff, the company can form dynamic teams to perform various tasks in its field of activity by attracting highly qualified external specialists.

The company’s quality management system has certificate No. TRBA 100 0591 according to the standard EN ISO 9001:2015 by TÜV Rheinland-Bulgaria EOOD. The quality management system meets the requirements of the IAEA Safety Standards applicable to nuclear power plants.

The leading associates of the company are highly qualified specialists in the fields of: nuclear power plant technology, thermal physics, thermal and nuclear power, industrial thermal engineering, applied mathematics, programming, instrumentation and control, automation and telemechanics. Many of our specialists have received additional qualifications at leading universities and companies from the USA, Finland, Spain, Italy, Russia, Ukraine, etc. The company also employs many young specialists, some of whom were its graduates and doctoral students.

Accumulated experience and capabilities in the field of production technology and safety of nuclear and energy, radiation protection, radioactive waste management and in the field of conventional energy

Building on the experience accumulated by its leading specialists since the early 1970s, over the years of its existence ENPRO CONSULT has developed in the following main areas:

1. Analysis and assessment of safety in nuclear power plants with VVER, including reactor installations of generation III and III+: with modern passive safety systems (such as AES 91, AES 92, AES 2006, AES MIR)
   • Thermohydraulic analyses of transient and emergency modes for all design states of the nuclear power unit; development, optimization and validation of models used in simulators, including severe accidents;
   • Modeling and conducting analyses of transient and emergency regimes for all operational states of VVER-440 and VVER-1000 units, including full implementation of the analyses included in the Chapter “Accident Analysis” of the Safety Justification Report (analysis of the state of the core, analysis of the behavior of the containment, determination of the source and composition of the radioactive discharge outside the containment, assessment of the radiological consequences for the population and the environment), in accordance with national and international standards and laws;
   • Analysis of transient and emergency regimes and justification of proposals for modernization and safety enhancement of nuclear power units;
   • Analysis of transient and emergency regimes and preparation of proposals for the purpose of extending the operational resource of nuclear power units;
   • Analyses of processes in the containment areas of NPPs in the event of severe accidents and preparation of tasks for the design of severe accident management systems for units with VVER-440 and VVER-1000;
   • Supporting analyses in the development of emergency instructions and manuals for the management of severe accidents;
   • Analysis of the radiological consequences of design basis and beyond design basis accidents, support in the preparation of emergency plans.
   • Analyses of the nuclear fuel cycle, including subcriticality in active areas and during transportation and storage of nuclear fuel.
   • Assessment and design of radiation protection when working in an environment with ionizing radiation.
2. Design and engineering of technological systems for nuclear and conventional power plants:
   • High-energy pipelines for water and steam under high pressure, including pipelines of the first NPP circuit;
   • Stress analysis for static and dynamic loads and temperature gradients;
   • Static loads on pipelines of classes 1-4 (conventional power plants) and 1-3 (nuclear power plants);
   • Dynamic loads from internal and external sources;
   • Fatigue and residual resource assessment of pipelines and equipment
   • Design of severe accident management systems (pressure reduction systems, filter ventilation systems, etc.).
3. System analyses and other types of analyses:
   • Development and updating of Nuclear Power Plant Safety Justification Reports;
   • Analyses and assessments of systems and equipment, including mechanical analyses of pipelines and systems of the primary and secondary circuits, reactor vessels and internal vessel devices;
   • Analysis of seismic effects on pipelines and equipment;
   • Analysis of the effects of internal initiating events (rupture of high-energy pipelines, thermal shock at high pressure, etc.);
   • Classification and qualification of equipment;
   • Analysis and design of technological systems (heating, ventilation and air conditioning);
   • Programs for monitoring the condition of reactor vessels;
   • Preparation of procedures for measuring the density of hermozones.
4. Measurement and control systems:
   • Pre-design studies, design and commissioning of I&C systems and process control equipment in nuclear and conventional;
   • Implementation of diagnostic systems and control systems for technological processes in NPPs, as well as systems for early detection of leaks (leak before rupture);
   • Analyses of existing I&C systems;.
   • Analysis and qualification of systems in terms of seismicity and working environment.
5. Activities in the design and management of decommissioning and radioactive waste management;
6. Development of regulatory documents in the field of nuclear power plant safety
7. Licensing activities.
8. Consulting services and project management.

Specific and extensive experience in projects related to the planning and implementation of new nuclear facilities, including nuclear power plants:

• Selection and licensing of sites for nuclear facilities
• Study and infrastructure of sites for nuclear facilities
• Analyses and design related to new nuclear facilities
• Consultations of potential investors in nuclear facilities

Cooperation with Bulgarian and foreign companies

ENPRO Consult has worked as a subcontractor or in cooperation with leading Western companies such as Westinghouse and AREVA, and also has a number of successful joint projects with EQE Bulgaria, EnergoService, IINAE BAS.

The company has a long-standing scientific and technical cooperation with the German GRS, in which the programs ATHLET, ATHLET-CD, COCOSYS and SUSA are developed.

Participation of ENPRO CONSULT specialists in IAEA activities and other research projects

1. IAEA projects
   • Safety assessment of VVER-440/213 (reference unit Bohunice V2 NPP, Slovakia)
   • Development of a severe accident simulator based on the MELCOR program (reference unit Bohunice V2 NPP, Slovakia)
   • Safety assessment of VVER-1000 (reference unit 5 at Zaporizhia NPP)
   • CRP J4.20.04 “Assessment of the Interfaces between Neutronic, Thermal-Hydraulic, Structural and Radiological Aspects in Accident Analysis”
   • CRP J7.20.05 “Evaluation of Uncertainties in Best Estimate Accident Analysis”
2. Development of IAEA lectures and training courses
   • Fundamentals of NPP technology with VVER1000/320
   • Analysis of severe accidents with the MELCOR program (Beijing, China)
   • Application of the RELAP5/3, SCDAP/RELAP and MELCOR programs for analysis of design basis and beyond design basis accidents (Mexico)
3. Participation in other international research projects
   • OECD/NEA VVER-1000 Coolant Transient Benchmark project (rupture of the main steam pipeline of VVER-1000)
   • BMU “Scientific-Technical Co-operation with Middle and East European Countries” project – Germany

ENPRO CONSULT’s capabilities to perform supporting activities

1. Providing technical consultations related to the systems of VVER units and their operational characteristics and verifying their compliance with the requirements of the Bulgarian, European and IAEA safety requirements.
2. Participation in the preparation and verification of safety justification reports related to the construction and modernization of units at NPPs in accordance with the Law on the Use of Atomic Energy and the NRA Regulations.
3. Technical and expert assistance in interpreting Bulgarian and Russian regulatory requirements and standards for design in nuclear and conventional energy facilities.
4. Translation of technical documentation from Bulgarian or Russian into English.
5. Translation of documentation from English into Bulgarian, as well as from Bulgarian into English.