Analysis of the influence of the heat transfer phenomena on the late phase of the ThAI Iod-12 test

32nd UIT (Italian Union of Thermo–fluid-dynamics) Heat Transfer Conference

物理学;力学

Gonfiotti, B.^1 ; Paci, S.^1

University of Pisa, Dipartimento di Ingegneria Civile e Industriale, Largo Luciano Lazzarino 1, Pisa

56126, Italy^1

关键词: Code comparisons;    Containment systems;    Heat exchange;    Radiological consequences;    Severe accident;    Steel vessels;    Thermal hydraulics;    Transfer phenomenon;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/547/1/012036/pdf
DOI  :  10.1088/1742-6596/547/1/012036

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Iodine is one of the major contributors to the source term during a severe accident in a Nuclear Power Plant for its volatility and high radiological consequences. Therefore, large efforts have been made to describe the Iodine behaviour during an accident, especially in the containment system. Due to the lack of experimental data, in the last years many attempts were carried out to fill the gaps on the knowledge of Iodine behaviour. In this framework, two tests (ThAI Iod-11 and Iod-12) were carried out inside a multi-compartment steel vessel. A quite complex transient characterizes these two tests; therefore they are also suitable for thermal- hydraulic benchmarks. The two tests were originally released for a benchmark exercise during the SARNET2 EU Project. At the end of this benchmark a report covering the main findings was issued, stating that the common codes employed in SA studies were able to simulate the tests but with large discrepancies. The present work is then related to the application of the new versions of ASTEC and MELCOR codes with the aim of carry out a new code-to-code comparison vs. ThAI Iod-12 experimental data, focusing on the influence of the heat exchanges with the outer environment, which seems to be one of the most challenging issues to cope with.