전산유체역학 기반 피동형 자동촉매 수소재결합기(PAR)에 의한 경수로 격납건물 내 수소 거동 연구

Abstract

As the Fukushima Daiichi nuclear disaster revealed, the presence of a hydrogen cloud in the containment can challenge its integrity if uncontrolled combustion occurs. To mitigate the hydrogen risks, a variety of measures have been proposed, for example passive autocatalytic recombiners (PARs). As the name implies, PARs passively combine hydrogen and oxygen on the surface of a catalyst, generating steam and heat. The heat released during the recombination process results in a buoyancy force that drives the flow. In this paper, the interaction of the gas cloud with a buoyant plum issuing from a PAR unit is investigated using the multi-phase (two-fluid, three-field) computational fluid dynamics code, CUPID. Similar to the OECD/SETH-2 PANDA ST5 test series, the PAR unit is modeled as a heater and simulated using the porous media approach in CUPID. The objective of this report is to investigate the capability of CUPID code to simulate the break-up of the initially stratified layer in response to the activation of a heat source.