Experimental study on hydrodynamic loads during air clearing process of safety relief system for NHR200-II reactor

IF 2.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2025-09-13 DOI:10.1016/j.anucene.2025.111871

Li shu , Zhang Dandi , Tong Lili , Cao Xuewu

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Abstract

In response to the design requirements of the safety discharge system for the primary loop of NHR200-II small onshore reactor, an experimental simulation device for the transient discharge system was established, with full pressure and flow rate during the air clearing process. Experimental study on the transient dynamic loading behavior of the water tank were conducted under the initial discharge pressure of 10 MPa. The influences of the submergence of sparger, pool temperature, discharge gas temperature, non-condensable gas fraction, and valve opening time on the amplitude and main frequency of dynamic load oscillation were obtained. The dynamic pressure amplitude under all conditions is between 23.8 kPa and 48.7 kPa, with a main frequency between 2.3 Hz to 3.1 Hz, showing low frequency and high amplitude characteristics. The findings indicated that the oscillation characteristics were most significantly influenced by submergence depth of the bubbler and the duration of valve opening, followed by water temperature, non-condensable gas fraction and discharge gas temperature.

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NHR200-II反应堆安全泄放系统清气过程水动力负荷试验研究

针对NHR200-II小型陆上反应堆一次回路安全排放系统的设计要求，建立了暂态排放系统的实验模拟装置，该装置在清风过程中具有全压力和全流量。在初始排放压力为10 MPa的条件下，对水箱的瞬态动加载特性进行了试验研究。得到了喷砂器淹没度、池温、排放气体温度、不凝气体分数和阀门开启时间对动负载振荡幅值和主频率的影响。各工况动压幅值在23.8 ~ 48.7 kPa之间，主频在2.3 ~ 3.1 Hz之间，表现出低频、高幅值的特点。结果表明，起泡器的浸入深度和阀门开启时间对振荡特性的影响最为显著，其次是水温、不凝性气体分数和排放气体温度。

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.