glossary:neutron-degradation
CONCEPT dossier

Neutron Degradation

Glossary term: Neutron Degradation

CONCEPT Fusion Physics

01 Executive_Summary

The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of first-wall and blanket modules.

02 Definition

The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of first-wall and blanket modules.

Related terms: Neutron Flux Superalloy Mondaloy 200 First-Wall Heat Flux

03 Deep_Dive_Intelligence

Overview

The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of first-wall and blanket modules.

Role: Glossary term: Neutron Degradation

Entity Type: Concept — Neutron Degradation is a technical concept or theoretical framework.

Technical Definition

The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of first-wall and blanket modules.

Related Concepts: Neutron Flux, Superalloy, Mondaloy 200, First-Wall Heat Flux

07 Key_Findings

  • ▸ Role: Glossary term: Neutron Degradation
  • ▸ Entity Type: Concept — Neutron Degradation is a technical concept or theoretical framework.
  • ▸ Related Concepts: Neutron Flux, Superalloy, Mondaloy 200, First-Wall Heat Flux

10 FAQ

What is Neutron Degradation? ▾
The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of first-wall and blanket modules.
What role does Neutron Degradation play in the research network? ▾
Neutron Degradation is classified under the "Fusion Physics" category, serving as Glossary term: Neutron Degradation. The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of...
What evidence supports the Neutron Degradation assessment? ▾
The intelligence assessment for Neutron Degradation is supported by 4 primary sources, 1 PDF document, and 1 citation. Key sources include "An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation", "An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation", and "Irradiation damage concurrent challenges with RAFM and ODS steels for fusion reactor first-wall/blanket: a review". These documents provide the evidentiary basis for the analysis.
What is the technical definition of Neutron Degradation? ▾
The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of...
What is the physics behind Neutron Degradation? ▾
The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of structural components and requires periodic replacement of...
What primary source PDFs are available for Neutron Degradation? ▾
1 PDF document is available: "An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation". This study presents an integrated computational framework combining neutron-transport calculations (MCNP), material inventory burn-up modeling (FISPACT), and electronic-structure density...
What external sources document Neutron Degradation? ▾
Neutron Degradation is documented by 4 external sources, including 1 Journal Article (Nuclear Fusion, IOPscience), 1 Journal Article (Nuclear Fusion, vol. 52, no. 8, 2012), and 1 Journal Article (Journal of Physics: Energy, 2022). Notable references include "An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation", "An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation", and "Irradiation damage concurrent challenges with RAFM and ODS steels for fusion reactor first-wall/blanket: a review".
What is the current status of Neutron Degradation? ▾
The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron...
How does Neutron Degradation relate to compact fusion research? ▾
Overview The progressive deterioration of material properties caused by prolonged exposure to neutron radiation. Neutrons displace atoms in the crystal lattice, causing embrittlement, swelling, and loss of mechanical strength. In fusion reactors, neutron degradation limits the lifetime of...
What documents should I read to learn more about Neutron Degradation? ▾
To learn more about Neutron Degradation, review the 4 primary sources, 1 PDF document, and related research finding linked in the source documents section of this dossier.

Source_Documents 1 FILES

An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation
This study presents an integrated computational framework combining neutron-transport calculations (MCNP), material inventory burn-up modeling (FISPACT), and electronic-structure density functional theory (DFT) to evaluate material degradation in the DEMO fusion reactor. It investigates spatial variations of neutron spectra, gas production (helium and hydrogen), and atomic displacements across structural and plasma-facing components. A simple physics-based model is used to predict critical helium-induced grain-boundary embrittlement lifetimes for candidate fusion materials including iron, tungsten, and beryllium.
PDF Archive →

External_References 5 REFS

/pdfs/DATRA-2026-Report.pdf#page=10 ref
/pdfs/DATRA-2026-Report.pdf#page=17 ref
/pdfs/DATRA-2026-Report.pdf#page=18 ref
/pdfs/FPA12_Wurden_LANL.pdf#page=28 ref
/pdfs/US20110142185A1.pdf#page=20 ref

Glossary_Sources

→ DATRA-2026-Report.pdf → DATRA-2026-Report.pdf → DATRA-2026-Report.pdf → FPA12_Wurden_LANL.pdf → US20110142185A1.pdf

Citations 1

  1. [1] (2012) — EURATOM/CCFE Fusion Association, Culham Centre for Fusion Energy

Verified_Primary_Sources 4 SOURCES

primary iter.org Journal Article (Nuclear Fusion, IOPscience)
An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation
Verifies: Neutrons cause atomic displacements generating radiation defects causing hardening, embrittlement, and irradiation creep; Nuclear reactions produce gas atoms (helium and hydrogen) causing swelling and embrittlement; Fusion has higher neutron fluxes and higher average neutron energies than fission; Helium forms clusters at grain boundaries leading to embrittlement
External Link ↗
primary iopscience.iop.org Journal Article (Nuclear Fusion, vol. 52, no. 8, 2012)
An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation
Verifies: Neutron irradiation causes progressive deterioration of material properties; Helium production causes swelling and embrittlement of materials; Grain-boundary-failure lifetimes vary with microstructure and chemical composition
External Link ↗
primary iopscience.iop.org Journal Article (Journal of Physics: Energy, 2022)
Irradiation damage concurrent challenges with RAFM and ODS steels for fusion reactor first-wall/blanket: a review
Verifies: Neutron damage and transmutation-induced gases cause deterioration of structural materials; Low-temperature hardening embrittlement, cavity swelling, and irradiation creep are key degradation mechanisms; DEMO first-wall/blanket expected to receive up to 50 dpa neutron dose
External Link ↗
primary frontiersin.org Journal Article (Frontiers in Materials, 2022)
Helium-Hydrogen Synergistic Effects in Structural Materials Under Fusion Neutron Irradiation
Verifies: 14 MeV neutron irradiation produces large amounts of helium and hydrogen simultaneously with displacement defects; High-flux neutron irradiation causes displacement defects up to hundreds of dpa; Property degradation and failure of structural materials is pressing challenge in fusion research
External Link ↗
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ID: glossary:neutron-degradation
Type: concept
Region: glossary
Last updated: Research database snapshot