Filter vent model for THALES-2 code was developed and the effect of the filter vent system was evaluated with the code. In Japan, the installation of filter venting system to the BWRs was considered after the accident of Fukushima-daiichi, where the total blackout caused by tsunami resulted in the large amount of fission product (FP) release to the environment. In this study, the effect of filter vent system in such a total blackout sequence was evaluated. The amount of fission product release was sma...
英字タイトル:
Effectiveness Evaluation of Filtered Containment Venting System using THALES-2

Abstract In 2011 at Fukushima Daiichi Nuclear Power Plant, which was a boiling water reactor (BWR), core meltdown occurred. There are control rod guide tubes (CRGTs) in lower plenum of pressure vessel of BWR and it is considered that CRGTs influence behavior of jet breakup of corium. In this research, the experiment about difference of behavior of jet breakup with and without pillar, which simulate CRGTs, and mechanism of difference of behavior of jet breakup in [5] was simulated and analyzed by parti...
英字タイトル:
Influence of Control Rod Guide Tubes in Lower Plenum for Behavior of Jet Breakup

For predicting the fuel debris distribution in Fukushima Daiichi Nuclear Power Plants (1FNPPs), it is essential to figure out the melt spreading behavior on primary containment vessel (PCV) floor. In this paper, we analyzed VULCANO spreading experiment programs using a particle method called “Moving Particle Full-Implicit method (MPFI)” which conserves an angular momentum. Phase change model was installed into MPFI method. two experiments having different corium characteristics were analyzed to confirm the ...
英字タイトル:
Evaluation of spreading-solidification behavior of high-temperature and highly viscous fluid by particle method with angular momentum conservation