A Rotodynamic Pump Seizure Transient Simulated Using the CATHARE-3 One-Dimensional Pump Model - CEA - Commissariat à l’énergie atomique et aux énergies alternatives
Communication Dans Un Congrès Année : 2019

A Rotodynamic Pump Seizure Transient Simulated Using the CATHARE-3 One-Dimensional Pump Model

Résumé

In the frame of an existing nuclear reactor safety evaluation or of a new reactor design process, hypothetical accidental transients are simulated using a system scale thermalhydraulic code. In such a context, the Code for Analysis of THermalhydraulics during an Accident of Reactor and safety Evaluation (CATHARE) is used as a reference in France. The thermalhydraulic behavior of nuclear reactor primary pumps influences a lot the whole reactor response during transients. Some initiating events such as a pump discharge pipe rupture, a pump seizure or a pump stop on inertia concern directly these reactor primary components. To model these types of accidental transients, knowing or being able to predict head and torque pump performances is necessary. For the moment, the method employed consists in giving dimensionless performance curves as input data to the CATHARE code, whose nodal pump model introduces head and torque contributions respectively into momentum and energy equations. To bring a solution allowing reactor transients simulation when only a pump geometry but no performance data are available, a predictive one-dimensional transient rotodynamic pump model is being developed into the CATHARE-3 code. Qualification has first been conducted on a low specific speed centrifugal pump (Nq = 12.3) for which one-phase and two-phase cavitating performance data are available. In the present study, a high specific speed pump (Nq = 120) is modelled. Its head and torque performances are predicted by the model and several slip factor correlations (used to model the fluid deviation at the impeller outlet) are tested. A pump stop on inertia and a pump seizure transient (instantaneous rotor stop from nominal rotational speed) are simulated using the 1D predictive pump model. Ability of the code to simulate these transients of interest is tested and final head loss due to the locked rotor is compared to available experimental data.
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Dates et versions

cea-04384242 , version 1 (10-01-2024)

Identifiants

  • HAL Id : cea-04384242 , version 1

Citer

L. Matteo, G. Mauger, P. Gyomlai, A. Dazin, N. Tauveron. A Rotodynamic Pump Seizure Transient Simulated Using the CATHARE-3 One-Dimensional Pump Model. 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18), Aug 2019, Portland (OR), United States. pp.4150-4163. ⟨cea-04384242⟩
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