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Open Access

ARTICLE

Transient Analysis of a Reactor Coolant Pump Rotor Seizure Nuclear Accident

Mengdong An1, Weiyuan Zhong1, Wei Xu2, Xiuli Wang1,*
1 Research Center of Fluid Machinery Engineering and Technology, Zhenjiang, 212013, China
2 School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
* Corresponding Author: Xiuli Wang. Email: email
(This article belongs to the Special Issue: Multiphase Flow and Vortex Dynamics in Fluid Machinery)

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2023.046604

Received 08 October 2023; Accepted 14 November 2023; Published online 01 March 2024

Abstract

The reactor coolant pump (RCP) rotor seizure accident is defined as a short-time seizure of the RCP rotor. This event typically leads to an abrupt flow decrease in the corresponding loop and an ensuing reactor and turbine trip. The significant reduction of core coolant flow while the reactor is being operated at full load can have very negative consequences. This potentially dangerous event is typically characterized by a complex transient behavior in terms of flow conditions and energy transformation, which need to be analyzed and understood. This study constructed transient flow and rotational speed mathematical models under various degrees of rotor seizure using the test data collected from a dedicated transient rotor seizure test system. Then, bidirectional fluid-solid coupling simulations were conducted to investigate the flow evolution mechanism. It is found that the influence of the impeller structure size and transient braking acceleration on the unsteady head (Hu) is dominant in rotor seizure accident events. Moreover, the present results also show that the rotational acceleration additional head (Hu1) is much higher than the instantaneous head (Hu2).

Keywords

Reactor coolant pump; bidirectional fluid-solid coupling; rotor seizure; nuclear accident

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