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research-article

Coupling of a reactor analysis code and a lower head thermal analysis solver

[+] Author and Article Information
Hiroshi Madokoro

Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
hiroshi.madokoro@kit.edu

Alexei Miassoedov

Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
alexei.Miassoedov@kit.edu

Thomas Schulenberg

Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
thomas.schulenberg@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4041278 History: Received June 08, 2018; Revised August 17, 2018

Abstract

Due to the recent high interest on IVR, development of detailed thermal and structural analysis tool, that can be used in a core-melt severe accident, is inevitable. Although RELAP/SCDAPSIM is a reactor analysis code, originally developed for US NRC, which is still widely used for severe accident analysis, the modeling of the lower head is rather simple, considering only a homogeneous pool. PECM/S, a thermal structural analysis solver for the RPV lower head, has a capability of predicting molten pool heat transfer as well as detailed mechanical behavior including creep, plasticity and material damage. The boundary condition, however, needs to be given manually and thus the application of the stand-alone PECM/S to reactor analyses is limited. By coupling these codes, the strength of both codes can be fully utilized. Coupled analysis is realized through a message passing interface, OpenMPI. The validation simulations have been performed using LIVE test series and the calculation results are compared not only with the measured values but also with the results of stand-alone RELAP/SCDAPSIM simulations.

Copyright (c) 2018 by ASME
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