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Feasibility study of a gas cartridge loop for the versatile test reactor

机译：多功能试验反应器气体盒环的可行性研究

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摘要

A feasibility study of a Gas Cartridge Loop (GCL) for the Versatile Test Reactor (VTR) was carried out to determine the performance requirements of major components and evaluate the performance during normal operation and transient conditions. The major components consist of a circulator/motor, a heater, a test article, a flow guide and a pressure vessel. The pressure vessel incorporates a pressurized, flowing helium loop with capability to test heat-producing test articles up to a 200 mm length of Energy Multiplier Module (EM2) fuel rod at a linear heat rate of 55 kW/m. The heat is rejected to VTR primary coolant sodium flowing along the outside of the GCL pressure vessel. For the baseline design, the helium temperatures at the test article inlet and outlet are 650 degrees C and 850 degrees C, respectively, when the mass flow is similar to 0.01 kg/s. The circulator inlet temperature is 362 degrees C and the motor power is 11.9 W. An electric heater power is 15.8 kW which is required to maintain the inlet temperature of the test article. Under the normal operating condition, the estimated fuel and cladding temperatures are 1233-1610 degrees C and 917-1219 degrees C, respectively.The controllability of the GCL was evaluated for the operational transients during a single fuel cycle by maneuvering either the motor or heater power to keep the test article outlet temperature at 850 degrees C. For an estimated perturbation of the test article power by +/- 3.5%, the required motor or heater power variations are +/- 4.1% or +/- 2.4%, respectively. The safety feature of the GCL was evaluated for the postulated accidents initiated by the VTR and GCL itself under the assumption that the helium flow is pseudo-steady. For the reactivity-initiated accident (RIA) like transient overpower (TOP) of the VTR, the simulation predicted that the margin to fuel melting is 24% and 5% for the protected and unprotected TOP, respectively. For GCL-initiating accidents, the simulation predicted the fuel reaches its melting point when the system loses mass flow by 52% with the nominal heater power or when the system pressure drops by 56% with the nominal motor and heater power level. For both the loss-of-flow and loss-of-pressure cases, the system shall terminate the heater and fission reaction at pre-determined set points. For the loss-of-power case, the GCL requires coastdown capability of the motor for at least several seconds to avoid the test article failure due to fuel melting.
机译：进行了通用测试反应器（VTR）的气体盒环（GCL）的可行性研究，以确定主要部件的性能要求，并在正常运行和瞬态条件下评估性能。主要部件包括循环器/电动机，加热器，试验品，流动引导和压力容器。压力容器包括加压，流动的氦气回路，其能够以55kW / m的线性热速率以55 kW / m的线性热速率测试高达200mm长度的能量乘法器模块（EM2）燃料棒的能量。热量被拒绝沿着GCL压力容器的外部流动的VTR初级冷却钠。对于基线设计，当质量流量类似于0.01kg / s时，试验品入口和出口处的氦温度分别为650℃和850摄氏度。循环入口温度为362摄氏度，电机功率为11.9W。电加热器功率为15.8 kW，需要保持测试制品的入口温度。在正常的操作条件下，估计的燃料和包层温度分别为1233-1610℃和917-1219摄氏度。通过操纵电动机或加热器在单个燃料循环期间评估GCL的可控性。为了将测试制品出口温度保持在850℃的电源。对于+/- 3.5％的测试制品功率的估计扰动，所需的电动机或加热器功率变化分别为+/- 4.1％或+/- 2.4％ 。评估GCL的安全特征对于VTR和GCL本身在假设氦流量是伪稳定的假设下发起的假期事故。对于像VTR的瞬态压力（顶部）的反应性发起的事故（RIA），模拟预测，燃料熔化的余量分别为保护和未受保护的顶部的24％和5％。对于GCL启动事故，仿真预测，当系统随着标称加热器电源或当系统压力下降56％时，当系统失去52％时，燃料达到其熔点。对于流量丧失和压力损失，系统应在预定设定点处终止加热器和裂变反应。对于电源损失，GCL需要电机的加速能力至少几秒钟，以避免由于燃料熔化而失效。

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  • 来源
    《Nuclear Engineering and Design》 |2021年第6期|111111.1-111111.14|共14页
  • 作者

    Choi Hangbok; Schleicher Robert W.; Shapovalov Kirill; Ellis Chris; Bolin John;

  • 作者单位

    Gen Atom Electromagnet Syst 16761 Via Campo Ct San Diego CA 92127 USA;

    Gen Atom Electromagnet Syst 16761 Via Campo Ct San Diego CA 92127 USA;

    Gen Atom Electromagnet Syst 16761 Via Campo Ct San Diego CA 92127 USA;

    Gen Atom Electromagnet Syst 16761 Via Campo Ct San Diego CA 92127 USA;

    Gen Atom Electromagnet Syst 16761 Via Campo Ct San Diego CA 92127 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas Cartridge Loop; Versatile Test Reactor; Gas-cooled Fast Reactor;

    机译：气体盒环;多功能测试反应器;气体冷却的快速反应器;

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