Use Cases
Submicron gap measurement
in nuclear fuel assemblies
Summary
When Nuclear Safety Depends on Microns, Measurement Precision is Non-Negotiable
The integrity and safe operation of nuclear reactors hinge on perfect spacing between fuel rods. Any deviation can compromise cooling efficiency, structural stability, and overall reactor safety. Accurate, reliable gap measurement solutions are essential throughout the reactor life cycle.
Ensuring Nuclear Reactor Safety with FOGALE’s GAPLINE Precision Gap Measurement Systems
The challenge
In nuclear environments, the measurement of fuel rod gaps faces extreme challenges:
- Harsh Conditions – High radiation, extreme temperatures, and confined spaces complicate traditional measurement methods.
- Critical Accuracy Needs – Even tiny deviations in gap can impact thermal management and reactor behavior.
- Non-Destructive Inspection – Measurements must be performed without damaging rods or assemblies.
- Adaptability to Different Reactor Designs – Different fuel assembly geometries require flexible sensor approaches.
- Inaccurate or unreliable gap measurements can compromise both reactor efficiency and safety.
APPLICATIONS IN NUCLEAR ENGINEERING
- Fuel Rod Assembly Inspection – Measure gaps between rods before, during, and after assembly.
- Reactor Core Monitoring – Verify critical spacing in operational or maintenance phases.
- Structural Health Assessments – Identify deformations or shifts over time.
- New Reactor Design Validation – Support R&D by verifying gap specifications under thermal and mechanical loading.
The solution
FOGALE Sensors has developed GAPLINE, a range of non-contact measurement solutions that use capacitive or optical technologies to deliver high-precision gap measurement between fuel rods—even under the harshest conditions.
Key Technologies:
- Capacitive Measurement – Highly accurate, flexible sensors ideal for tight environments and high radiation areas.
- Optical Systems – Light-based measurement; robust and precise, and adaptable for demanding configurations.
- Modular and Customizable Designs – Sensor configurations adapted to match various reactor types and assembly designs.
System Components:
- Sensor Module – Measures gap with micrometric precision (capacitive or optical)
- Conditioning Module – Connected through triaxial cables (capacitive) or through transmitter/receiver (optical)
KEY ADVANTAGES OF GAPLINE:
| Feature | Benefit |
|---|---|
| Dual Technology Capability (Capacitive & Optical) | Adaptation to a wide range of reactor environments |
| High Precision & Reliability | Measurement accuracy ensures optimal cooling and structural safety |
| Non-Destructive, Non-Contact Measurement | No risk to delicate fuel rod assemblies |
| Modular and Scalable Design | Easily adaptable to different reactor designs and sizes |
| Proven in Field Applications | Trusted by leading nuclear operators and manufacturers |
The results
FOGALE’s GAPLINE range provides the ultimate solution for accurate, safe, and flexible inspection of critical nuclear components. Thanks to extensive know-how in capacitive and optical measurements, FOGALE ensures the highest standards of reactor performance and safety—fuel rod by fuel rod.