Development of active and passive reactivity control systems for a fast spectrum small modular reactor

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

Annals of Nuclear Energy Pub Date : 2024-10-19 DOI:10.1016/j.anucene.2024.110979

Muhammad Farid Khandaq , Deokjung Lee

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Abstract

This paper presents the development of active and passive reactivity control systems implemented in a fast-spectrum small modular reactor (SMR). The design of the control assembly serving as an active system still relies on a conventional rod-typed geometry. To enhance its worth, a thermalizing ZrH_1.6 pin is introduced, which softens the neutrons around the control assembly, leading to increased neutron absorption in the absorber material. Additionally, a control assembly with a partial-length absorber is strategically placed at a certain location to mitigate high peak power levels. Two passive systems have been developed to enhance reactor safety: the gas expansion module (GEM) aimed to mitigate the unprotected loss of flow (ULOF), and the liquid lithium-6 absorber intended to address unprotected transient overpower (UTOP) and unprotected loss of heat sink (ULOSH) scenarios. With a total of 24 GEMs and 18 lithium-6 channels installed, they provide negative reactivity ranging from about 932 to 693 pcm (1.17$ to 1.03$) and 521 to 602 pcm (0.65$ to 0.89$), respectively.

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为快速频谱小型模块化反应堆开发主动和被动反应性控制系统

本文介绍了在快频谱小型模块化反应堆（SMR）中实施的主动和被动反应性控制系统的开发情况。作为主动系统的控制组件的设计仍然依赖于传统的杆式几何结构。为了提高其价值，引入了一个热化 ZrH1.6 栓，它能软化控制组件周围的中子，从而增加吸收材料对中子的吸收。此外，带有部分长度吸收器的控制组件被战略性地放置在特定位置，以缓解峰值功率水平过高的问题。为提高反应堆的安全性，还开发了两个无源系统：气体膨胀模块（GEM），旨在减轻未受保护的流量损失（ULOF）；液态锂-6 吸收器，旨在解决未受保护的瞬态过功率（UTOP）和未受保护的散热损失（ULOSH）情况。共安装了 24 个 GEM 和 18 个锂-6 通道，它们提供的负反应性分别为 932 至 693 pcm（1.17 美元至 1.03 美元）和 521 至 602 pcm（0.65 美元至 0.89 美元）。

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

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.