NUCLEAR TECHNOLOGY DEPARTMENT

FİGES Nuclear Technology (NT) Department offers lots of technical support and expertise regarding the fission nuclear technologies, including: Pressurized Water Reactors (PWR, EPR, VVER), Boiling Water Reactor (BWR) and Gen IV Reactors (MSR).

In the FİGES NT Department, thermal hydraulic analyses of nuclear components, design and safety analyses are carried out. In this context, the flow characteristics of cooling cycle, stress analyses, seismic analyses, vibration and fatigue analyses, dispersion analyses, aircraft impact analyses and system behavior in the post-accident phase are investigated by computational tools using appropriate numerical methods.

In this department, R&D activities are also carried out especially on the new generation nuclear reactor technologies. FİGES is a partner of SAMOFAR project as an observer. SAMOFAR project is a European Union project. Concept design for Molten Salt Reactor is carrying out in this project. R&D studies are performing in FİGES NT Department to design primary and secondary side heat exchangers.

Nuclear Safety is in the origin of FİGES NT activities. The adopted Nuclear Safety Culture concept is based on IAEA and Turkish regulatory guidelines.

FİGES invests the requirements for authorization certificates of Facility Security and NATO-Confidential due to increasing necessity in Defense industry in Turkey. FİGES also has certificate of ISO 9001-2008.

Subchannel Analyses

In recent years, the growing demand for advanced nuclear reactor safety analyses has led to a rapid development of methods for multi-dimensional thermal-hydraulic analyses. These methods have become more and more complex in order to take into account the expected physical phenomena under steady-state conditions and time-dependent reactor conditions. There are various software and codes used for advanced thermal-hydraulic calculations throughout the world.

Objectives of subchannel analysis;

  • Determination of fuel temperatures
  • Determination of the temperature of the fuel claddings
  • Detection of coolant temperatures
  • Flow area calculations
  • Analyses of System Elements

Thermal-fluid analyses are carried out for a large part of the elements forming the nuclear reactor system. These analyses can be performed with using ANSYS software for steam generators, circulation pumps, passive cooling systems, pressurizers and pipes used in fluid transport by FİGES NT department.

CFD (Computational Fluid Dynamics) is the most appropriate tool for complex flow analyses, such as Nuclear Systems. However, it should be kept in mind that the use of this tool requires knowledge, attention and experience in identifying appropriate boundary conditions, creation of mesh and correctly interpreting the results.
The following calculations can be made for the Nuclear Power Plants with CFD analyses in the NT department;

  • Steady state or time dependent fluid behavior
  • Pressure, velocity and temperature distributions
  • Heat transfer calculations
  • Single and multi-phase flows
  • Radiological fallout analyses
  • Safety Analyses

Design based or beyond design safety calculations and accident scenarios for nuclear power plants are carried out by the thermal hydraulic codes and structural analyses of the reactor. By using thermal hydraulic codes, the safety calculations can be made for loss of fluid circulating the reactor due to a large or small fractures or leaks which may take place in any part of the reactor. The structures of the power plant are analyzed for resistance to any aircraft crash and this ensures the safety of the reactor building.

System Design

Design and modeling of nuclear system elements such as reactor vessel, steam generator and pressurizer are made. Various software and simulation tools are used for design improvements and increasing the performance of these elements.

In addition, structural strength analyses of all pressure vessels in the system, fatigue analyses of moving and stationary system parts, seismic analyses of the nuclear power plant site and acoustic analyses are also performed.

Global Partnerships

The FİGES NT department is closely monitoring the nuclear technology agenda and is currently actively involved in a European Union project (Molten Salt Reactors) in the 4th generation reactor technologies. Also as an attendant at the benchmark studies in various European countries, FİGES NT is moving towards the goal of becoming a leader in the field of nuclear technology in Turkey.