Effective diffusivity and solubility of gaseous tritium in selected microporous thermal insulation materials

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-04-17 DOI:10.1016/j.fusengdes.2025.115026

A.S. Teimane , E. Pajuste , A. Actins , P. Kalnina , A. Zekunde , A. Kizilovs , D. Demange , J. Somvanshi , J. van der Laan

{"title":"Effective diffusivity and solubility of gaseous tritium in selected microporous thermal insulation materials","authors":"A.S. Teimane , E. Pajuste , A. Actins , P. Kalnina , A. Zekunde , A. Kizilovs , D. Demange , J. Somvanshi , J. van der Laan","doi":"10.1016/j.fusengdes.2025.115026","DOIUrl":null,"url":null,"abstract":"<div><div>Permeation, effective diffusivity and solubility experiments of tritium in thermal insulation materials proposed for ITER is vital for assessing the conditions required for the operation of the Test Blanket System, including its maintenance. With these results, simulation models can be prepared to predict tritium migration behaviour and therefore, air in the estimation of tritium inventory within the concerned components, and the concerned outgassing rates.</div><div>This paper looks at three different grades of microporous thermal insulation material, which have been tested for the behaviour of tritium in the form of HT. Effective diffusion coefficients, activation energy and effective solubility has been assess together with characterization of the material.</div><div>An effective diffusion coefficient, which involves gas transport through structure defects, has been evaluated based on Fick's law. Effective diffusivity results are obtained in the range of 1 to 5 × 10<sup>–1</sup> cm<sup>2</sup>/s and the results show no significant difference between the three grades analysed. Effective diffusivity was found to be significantly larger than in other silica-based materials, which can be explained by structural defects observed using SEM. Calculations show that the material's solubility is mostly dominated by its porosity.</div></div>","PeriodicalId":55133,"journal":{"name":"Fusion Engineering and Design","volume":"216 ","pages":"Article 115026"},"PeriodicalIF":1.9000,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fusion Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0920379625002261","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Permeation, effective diffusivity and solubility experiments of tritium in thermal insulation materials proposed for ITER is vital for assessing the conditions required for the operation of the Test Blanket System, including its maintenance. With these results, simulation models can be prepared to predict tritium migration behaviour and therefore, air in the estimation of tritium inventory within the concerned components, and the concerned outgassing rates.

This paper looks at three different grades of microporous thermal insulation material, which have been tested for the behaviour of tritium in the form of HT. Effective diffusion coefficients, activation energy and effective solubility has been assess together with characterization of the material.

An effective diffusion coefficient, which involves gas transport through structure defects, has been evaluated based on Fick's law. Effective diffusivity results are obtained in the range of 1 to 5 × 10^–1 cm²/s and the results show no significant difference between the three grades analysed. Effective diffusivity was found to be significantly larger than in other silica-based materials, which can be explained by structural defects observed using SEM. Calculations show that the material's solubility is mostly dominated by its porosity.

查看原文本刊更多论文

气态氚在选定的微孔隔热材料中的有效扩散率和溶解度

氚在ITER隔热材料中的渗透、有效扩散率和溶解度实验对于评估测试包层系统运行所需的条件，包括其维护至关重要。有了这些结果，可以建立模拟模型来预测氚的迁移行为，从而估计空气中有关成分中的氚库存，以及有关的放气速率。本文研究了三种不同等级的微孔隔热材料，测试了氚以HT形式的行为。测定了有效扩散系数、活化能和有效溶解度，并对材料进行了表征。根据菲克定律计算了气体通过结构缺陷的有效扩散系数。在1 ~ 5 × 10-1 cm2/s范围内得到了有效扩散系数的结果，结果表明三个等级之间没有显著差异。有效扩散率明显大于其他硅基材料，这可以通过扫描电镜观察到的结构缺陷来解释。计算表明，材料的溶解度主要由其孔隙度决定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.