Lead alloy is used as coolant in Lead-based cooled Fast Reactor (LFR). The natural characteristics of lead alloy are combined with the simple structural design of LFR. This constitutes the inherent safety characteristics of LFR. The main work of this paper is to take the main coolant pump (MCP) in the lead-cooled fast reactor (LFR) as the research object, and to study the flow pattern distribution of the internal flow field under the reverse rotation pump condition, the reverse rotation positive-flow braking condition and the reverse rotation negative-flow braking condition. In this paper, the double-outlet volute type and the space guide vane are selected as the potential designs of the CLEAR-I MCP. In this paper, the CFD method is used to study the potential reverse accident of the MCP. It is found that the highest flow velocity in the impeller appears at the impeller outlet, and the Q-H curves of the two design programs basically coincide. The space guide vane type MCP has better hydraulic performance under the reverse rotation positive-flow condition, the Q-H curves of the two designs gradually separate with increasing flow rate, and the maximum flow velocity inside the space guide vane type MCP is obviously lower than that of the double-outlet volute type. For the reverse rotation test of MCP, only the condition of the forward rotating pump of the main coolant pump is tested and verified. For the simulation of the MCP in LBE medium, it proved that the turbulence model and basic settings selected in the simulation are reliable.

铅合金用作铅基冷却快堆（LFR）的冷却剂。铅合金的自然特性与LFR简单的结构设计相结合。这构成了 LFR 的固有安全特性。本文的主要工作是以铅冷快堆（LFR）中的主冷却剂泵（MCP）为研究对象，研究逆向旋转泵工况下内部流场的流型分布，反转正流制动工况和反转负流制动工况。在本文中，双出口蜗壳型和空间导叶被选为 CLEAR-I MCP 的潜在设计。本文采用CFD方法研究MCP潜在的逆向事故。发现叶轮内最高流速出现在叶轮出口处，两种设计方案的QH曲线基本吻合。空间导叶型MCP在反向旋转正流条件下具有较好的水力性能，两种设计的QH曲线随着流量的增加逐渐分离，空间导叶型MCP内部的最大流速明显低于双出口蜗壳型。对于 MCP 的反转试验，仅对主冷却液泵的正转泵的情况进行试验和验证。对于 LBE 介质中 MCP 的模拟，证明了模拟中选择的湍流模型和基本设置是可靠的。空间导叶型MCP在反向旋转正流条件下具有较好的水力性能，两种设计的QH曲线随着流量的增加逐渐分离，空间导叶型MCP内部的最大流速明显低于双出口蜗壳型。对于 MCP 的反转试验，仅对主冷却液泵的正转泵的情况进行试验和验证。对于 LBE 介质中 MCP 的模拟，证明了模拟中选择的湍流模型和基本设置是可靠的。空间导叶型MCP在反向旋转正流条件下具有较好的水力性能，两种设计的QH曲线随着流量的增加逐渐分离，空间导叶型MCP内部的最大流速明显低于双出口蜗壳型。对于 MCP 的反转试验，仅对主冷却液泵的正转泵的情况进行试验和验证。对于 LBE 介质中 MCP 的模拟，证明了模拟中选择的湍流模型和基本设置是可靠的。空间导叶式MCP内最大流速明显低于双出口蜗壳式。对于 MCP 的反转试验，仅对主冷却液泵的正转泵的情况进行试验和验证。对于 LBE 介质中 MCP 的模拟，证明了模拟中选择的湍流模型和基本设置是可靠的。空间导叶式MCP内最大流速明显低于双出口蜗壳式。对于 MCP 的反转试验，仅对主冷却液泵的正转泵的情况进行试验和验证。对于 LBE 介质中 MCP 的模拟，证明了模拟中选择的湍流模型和基本设置是可靠的。