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Upgrade of apollo3® internal thermohydraulic feedback model with THEDI, and application to a control-rod ejection accident

Abstract : In the frame of APOLLO3 ® project (new generation CEA code system for core physics analysis based on deterministic neutron transport), it was decided to develop a new internal thermohydraulic feedback model: THEDI, a multi-1D, two-phase flow solver. This paper is dedicated to the presentation of the integration of THEDI in the APOLLO3 ® code. After a brief presentation of THEDI and of its APOLLO3 ® 's interface, some code-to-code verification cases are presented. First, APOLLO3 ® , using THEDI, is compared to CRONOS2 (a neutronic CEA code of the previous generation with its own feedback model) for steady-state and depletion calculations on a small PWR core. Then, APOLLO3 ® is compared to a CRONOS2-FLICA4 (a two-phase, four-equation three-dimensional thermohydraulic CEA code) coupling for control-rod ejection accidents, on a similar core. The objective of these comparisons is to verify the coupling between APOLLO3 ® neutronic solvers and THEDI. They are therefore all made with identical models and data, and they all lead to very close results. Thanks to THEDI integration, APOLLO3 ® 's capabilities to model a nuclear reactor core are improved. Thermohydraulic feedbacks can now be taken into account, in both steady-state and transient, for possibly diphasic flows.
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https://hal-cea.archives-ouvertes.fr/cea-02623807
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Submitted on : Tuesday, May 26, 2020 - 9:25:49 AM
Last modification on : Tuesday, June 2, 2020 - 2:04:04 PM

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  • HAL Id : cea-02623807, version 1

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Cyril Patricot, Roland Lenain, Dominic Caron. Upgrade of apollo3® internal thermohydraulic feedback model with THEDI, and application to a control-rod ejection accident. M&C2019, ANS, Aug 2019, Portland, United States. ⟨cea-02623807⟩

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