Technical Consulting

DEI’s staff includes industry recognized experts in a wide range of subject areas including power plant chemistry, material and corrosion issues, steam generator thermal performance, life cycle management of power plant equipment, radiation field management at nuclear power plants (PWR and BWR), chemical and mechanical cleaning processes, and stress and structural analysis. Accordingly, since the company was founded in 1980, DEI has provided a broad range of technical consulting services to industry clients.

  • Probabilistic Analysis

    Since the 1980’s, DEI has been an industry leader in the application of statistical methods for predicting material degradation and thermal performance trends. Additionally, DEI has developed novel probabilistic methods for quantifying the complex economics of steam generator maintenance, and DEI routinely assists utilities in the development of life cycle management plans for PWR steam generators and other power plant equipment.

  • Computer Modeling

    DEI has routinely performed computer analysis to solve complex fracture mechanics, stress intensity, thermal hydraulics, and fluid mechanics problems. Using the latest computer analysis software such as ANSYS, CFX, and MATLAB in combination with fundamental physics DEI is able to produce reports and calculations for a variety of engineering problems under a rigorous quality assurance program.

Life Cycle Management of Power Plant Equipment

The management of corrosion product deposition is an ongoing challenge facing the nuclear power industry, particularly for PWR steam generators. The buildup of deposits in steam generators can accelerate tubing degradation, reduce heat transfer efficiency and/or disrupt normal thermal hydraulics. Periodic maintenance activities designed to remove these deposits are important for maintaining steam generator integrity, operability and performance. However, these maintenance activities represent a significant economic investment for utilities, and optimizing the timing and frequency of maintenance activities can be a significant challenge.

Stress Analysis and Fracture Mechanics

Vessel Tensioning

Using FEA techniques DEI determined an optimized stud-tensioning procedure.

DEI is an industry leader in the stress analysis of components, structures and systems. Using both classical and numerical (finite element) techniques, DEI routinely solves problems that require linear and nonlinear elastic stress analysis, fracture mechanics, steady state and transient thermal analysis, and modal analysis.

Power Plant Chemistry, Corrosion, and Materials

Corrosion occurs when susceptible materials are exposed to an aggressive environment. DEI is an industry leader in managing corrosion, through selection of better materials, optimization of chemistry, and development of inspection and repair programs when corrosion is unavoidable. DEI was a pioneer in the field of steam generator tube degradation prediction and continues to lead the industry.

DEI’s state of the art facilities are used to support corrosion research through failure investigations, characterization of materials, and test programs.

DEI is the technical developer of many "best practices" documents adopted around the world for corrosion control and frequently presents the technical bases for these practices to the NRC and other regulators.

Radiation Field Management

Neutron activation of migrating corrosion products is a major source of the radiation fields that can potentially affect nuclear worker health. DEI is the technical developer of the latest industry guidance for measuring radiation fields in nuclear power plants. DEI is an industry leader in assessment of radiation fields and developing optimum chemistry programs to minimize worker exposure to radiation.