Nuclear power plants use the energy generated from nuclear fission from uranium-plutonium contained in nuclear fuel, in other words, nuclear energy to generate power. In order to safely manage nuclear power, it is necessary to safely and efficiently produce energy from the nuclear fuel and regulate and manage the radiation and radioactive materials generated through this process.
Our work in reactor physics and radiation analysis plays an important and core role in this nuclear power.


Reactor physics analysis
The reactors at nuclear power plants are periodically stopped and inspected for safety purposes. During this process, some of the fuel assemblies that have consumed a sufficient amount energy are replaced with new ones. By appropriately positioning these fuel assemblies, it is possible to design a reactor capable of surely, safely and efficiently generating a certain amount of energy over a planned period.
Further, reactor physics analysis can also be used to confirm the integrity of the nuclear fuel when abnormalities occur within the reactor or whether the reactor can be safely stopped in the event of an emergency.


Radiation exposure assessment
Analyzing the transfer and behavior of radioactive material in a nuclear power plant, we can assess the volume of radioactive material accumulated within each of the facilities during normal operation or when an incident occurs and the volume of radioactive material released into the environment. Further, we can also assess the exposure doses to personnel working within a nuclear power plant and the general public in the vicinity of the plant. Radiation exposure assessment involves taking into consideration the different functions of each facility within the plant and different behaviors of different types of radiative material and applying this to facility design and changes to operations, etc.


Radiation shielding design
Radiation shielding design covers a broad range of areas relating to radiation, including the design of radiation shielding walls within nuclear power plants, the assessment of radiation dosages of equipment, and assessment of the volume of radioactive materials in the back end.
Our work in this field includes taking into consideration a range of factors, such as seismic components and transportation to achieve an optimum balance in order to avoid superfluous design while also maintaining the safety of the facility and equipment.

Primary analysis codes



Criticality safety design
Criticality safety covers all areas relating to the handling of fissile materials, such as uranium and plutonium, including the design of nuclear power plants, spent fuel reprocessing plants, nuclear fuel production plants and the design of vessels for the transportation and storage of spent fuel materials.
Criticality safety involves taking into consideration the arrangement of fissile material and the use of structural material to prevent a nuclear fission chain reaction and applying this to equipment design and plant operations in order to ensure safety when a chain reaction is convergent in a “subcritical” state in a variety of situations, such as in the event of an earthquake.

Primary analysis codes