Assessment of radiation dose and environmental impact from design basis accidents at the BAEC TRIGA research reactor

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-09-11 DOI:10.1016/j.nucengdes.2025.114465

Anisur Rahman , Abdus Sattar Mollah , Md Abdul Malek Soner

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Abstract

It is crucial to investigate the radiation impacts of the nuclear reactor to protect the environment and human health. A computational approach was used to estimate radiation doses and environmental effects from design basis accidents at the BAEC TRIGA Research Reactor (BTRR). ORIGEN-2.2 was used to estimate the reactor’s radionuclide inventory, while HotSpot 3.1.2 modeled radiation dose and radionuclide dispersion. A site-specific climatic scenario was incorporated to estimate individual and effective tissue doses within a 100 km downwind radius of the reactor. Three accident scenarios were analyzed: releases through the emergency ventilation system (scenario 1), malfunctioning emergency ventilation system (scenario 2), and ground-level releases via structural penetrations (scenario 3). Maximum total effective dose equivalent (TEDE) values were 0.37 mSv, 170 mSv, and 8.5 × 10⁵ mSv, respectively, with the most significant impact occurring in scenario 3, affecting an area of 0.20 km² with doses exceeding 100 mSv. Critical organ doses were identified, with the thyroid, skin, red marrow, and lungs receiving significant doses. While scenario 1 poses minimal risk, scenarios 2 and 3 would require evacuation, sheltering, and iodine prophylaxis. These findings will support the TRIGA reactor operator in updating the Safety Analysis Report (SAR) to ensure compliance with regulatory standards.

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BAEC TRIGA研究堆设计基础事故辐射剂量及环境影响评估

研究核反应堆的辐射影响对保护环境和人类健康至关重要。采用计算方法对设计基础事故的辐射剂量和环境影响进行了估算。使用ORIGEN-2.2估算反应堆的放射性核素库存，HotSpot 3.1.2模拟辐射剂量和放射性核素扩散。结合特定地点的气候情景来估计反应堆下风半径100公里内的个体和有效组织剂量。分析了三种事故情景：通过紧急通风系统释放（情景1）、紧急通风系统故障释放（情景2）和通过结构穿透释放地面（情景3）。最大总有效剂量当量（TEDE）值分别为0.37毫西弗、170毫西弗和8.5 × 105毫西弗，影响最显著的是情景3，剂量超过100毫西弗影响的面积为0.20平方公里。确定了关键器官剂量，甲状腺、皮肤、红骨髓和肺接受显著剂量。虽然情景1的风险最小，但情景2和情景3需要疏散、庇护和碘预防。这些发现将支持TRIGA反应堆运营商更新安全分析报告（SAR），以确保符合监管标准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.