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NEURAP-A Dedicated Neutron-Imaging Facility for Highly Radioactive Samples.

Eberhard Lehmann¹, Knud Thomsen¹, Markus Strobl¹

¹Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland.

Journal of Imaging

|August 30, 2021

Summary

NEURAP enables neutron imaging of highly radioactive samples using specialized Dy-loaded plates. This technique reveals material degradation in nuclear components and fuel rods, aiding in extending operational lifetimes.

Keywords:

NEURAP NEUTRA SINQ—Swiss spallation neutron source lead neutron-imaging nuclear fuel radioactive specimen radiography spallation target zircaloy

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Area of Science:

Nuclear Engineering
Materials Science
Radiation Detection

Background:

Highly radioactive samples pose challenges for standard imaging techniques due to intense gamma radiation.
Existing instrumentation for neutron imaging of such materials is scarce worldwide.
The NEURAP setup at the Swiss neutron spallation source (SINQ) was developed to address these limitations.

Purpose of the Study:

To detail the NEURAP setup and its specialized procedure for neutron imaging of highly radioactive samples.
To present key applications of NEURAP in analyzing operational components and nuclear fuel.
To highlight the insights gained from quantitative image analysis regarding material degradation.

Main Methods:

Utilizing Dysprosium (Dy)-loaded imaging plates, sensitive to neutrons but not gamma rays.
Implementing a multi-step process involving neutron irradiation, gamma erasure, and delayed readout of neutron-induced signals.
Applying quantitative analysis to neutron radiographs of SINQ target components and spent nuclear fuel rods.

Main Results:

Accumulation of spallation products was identified in SINQ target components.
Aggregation of hydrogen was observed in spent nuclear fuel pins and their cladding.
Detailed characterization of material degradation in operational nuclear materials was achieved.

Conclusions:

NEURAP provides a unique capability for routine neutron imaging of highly radioactive samples.
The findings contribute to understanding material degradation mechanisms in nuclear applications.
Optimized operational regimes and extended safe lifetimes for nuclear components are potential outcomes.