Shunsuke Kenjo, Makoto Oyaidzu, Saerom Kwon, Kentaro Ochiai, Satoshi Sato
{"title":"Dose assessment for radioactive products distributed on liquid Li loops of fusion neutron sources","authors":"Shunsuke Kenjo, Makoto Oyaidzu, Saerom Kwon, Kentaro Ochiai, Satoshi Sato","doi":"10.1016/j.fusengdes.2025.114901","DOIUrl":null,"url":null,"abstract":"<div><div>Radiation dose rates around liquid Li loops in International Fusion Materials Irradiation Facility (IFMIF)-like fusion neutron sources, such as A-FNS, increase because of the radionuclides produced by high-energy deuterons and neutrons. This study assesses radiation dose rates around the pipe, heat exchanger (HX), and electromagnetic pump (EMP) of a liquid Li loop using the Monte Carlo code MCNP6.2 and the photon data library mcplib84 to advance the development of maintenance strategies. The radiation sources include not only major nuclides (tritium and Be-7) reported in previous studies but also other radionuclides that have not been well investigated thus far. The calculation results suggest that hands-on maintenance of Li pipes can be performed after the Li drain. However, accesses HX and EMP are limited because of nuclides such as Y-88, which are produced from impurities in liquid Li, even when Be-7 is trapped in Cold Trap.</div></div>","PeriodicalId":55133,"journal":{"name":"Fusion Engineering and Design","volume":"214 ","pages":"Article 114901"},"PeriodicalIF":2.0000,"publicationDate":"2025-05-01","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/S0920379625001036","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/27 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Radiation dose rates around liquid Li loops in International Fusion Materials Irradiation Facility (IFMIF)-like fusion neutron sources, such as A-FNS, increase because of the radionuclides produced by high-energy deuterons and neutrons. This study assesses radiation dose rates around the pipe, heat exchanger (HX), and electromagnetic pump (EMP) of a liquid Li loop using the Monte Carlo code MCNP6.2 and the photon data library mcplib84 to advance the development of maintenance strategies. The radiation sources include not only major nuclides (tritium and Be-7) reported in previous studies but also other radionuclides that have not been well investigated thus far. The calculation results suggest that hands-on maintenance of Li pipes can be performed after the Li drain. However, accesses HX and EMP are limited because of nuclides such as Y-88, which are produced from impurities in liquid Li, even when Be-7 is trapped in Cold Trap.
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.
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