journal article·2020-11

Tritium and helium embrittlement of austenitic steels used in tritium storage and delivery system

Sojeong Yang, Jae-Uk Lee, Hyun-Goo Kang, Min Ho Chang, Takuji Oda

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Abstract

Abstract Embrittlement caused by tritium and helium produced as the beta-decay product of tritium affects the structural integrity of materials used in nuclear fusion reactors. We assess the embrittlement of 316L stainless steel used as the primary vessel in the tritium storage and delivery system with a planned operation scenario for the International Thermonuclear Experimental Reactor. First, based on the current system design and planned operation scenario, the tritium and helium concentrations in the primary vessel material are calculated. The effects of tritium and helium on the mechanical properties are estimated in comparison with available experimental data. We conclude that, if a forged material is used, the mechanical properties of the primary vessel will not significantly degrade over planned operation in terms of fracture toughness. In addition, fatigue and creep are expected not to be significant. Last, we discuss two possible methods to lower the concentration of helium for the purpose of reducing the residual risk.
Source: openaire · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Superconducting Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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