Thermal Barrier Engineering in SMR Modular Containment Structures

Thermal Barriers for Modular Containment Structures: ERATHERM Solutions

In Small Modular Reactors (SMRs), the modular containment structure is the final and most critical physical barrier preventing the release of radioactive materials into the environment. The region between the Reactor Pressure Vessel (RPV) and the outer containment shell requires not only pressure management but also highly controlled thermal transition.

ERATHERM provides advanced engineering, simulation, and implementation services to maintain thermal balance within containment structures, protect structural integrity from thermal stresses, and ensure the effectiveness of emergency cooling systems.

Critical Functions of Thermal Barriers in Containment Structures

Thermal management within containment structures is one of the cornerstones of nuclear safety. The design of these thermal barriers serves the following objectives:

Structural Stress Management:
Limiting temperature differentials between the inner and outer surfaces of the containment vessel (typically steel or concrete) to prevent cracking and deformation.

Heat Transfer Control:
Preventing unnecessary heat dissipation to the environment during normal reactor operation, thereby improving overall plant efficiency.

Passive Cooling Support:
Managing thermal paths that enable controlled heat transfer to the external atmosphere or cooling pools during potential accident scenarios.

ERATHERM Thermal Solutions for SMR Containment Structures

ERATHERM adopts a holistic approach to meet the complex physical requirements of nuclear containment systems:

1. Conceptual Design and Thermal Barrier Strategies
Each SMR design employs a unique cooling and protection strategy. During the early project phases, ERATHERM determines the most suitable concept among vacuum insulation, reflective barriers, or composite thermal shields. At this stage, the containment structure’s response to internal pressure and temperature fluctuations is modeled.

2. Computational Analysis and 3D Thermal Simulations
Heat transfer within containment structures occurs through both conduction and radiation mechanisms.

Thermal Gradient Analysis:
Calculation of temperature variations (thermal gradients) across containment walls.

CFD Simulation:
Analysis of airflow or gas circulation within the containment and its impact on thermal barrier performance.
Thermal Bridge Identification:
Detection of localized overheating points at support structures and penetration interfaces.

3. Engineering Design and Implementation Services
We install nuclear-grade insulation systems that demonstrate high temperature resistance and long-term stability under radiation exposure. In critical areas such as penetration insulation, ERATHERM provides flexible thermal barrier solutions that accommodate thermal expansion while effectively blocking heat transfer.

4. Audit, Analysis, and Optimization Capabilities
We assess the thermal integrity of containment structures in operation or during testing phases. Through our thermal audit services, insulation weaknesses and energy losses are identified, enabling optimization of system compatibility with passive safety systems.