In a hypothetical severe accident, the fuel assemblies and structure in the core region could melt. The corium from the core region may fall into the reactor lower plenum. Jet breakup phenomenon would happen while corium falling into water pool in the lower plenum. In a boiling water reactor lower plenum, the control rod guide tubes (CRGTs) will create flow channels for the falling jet. Therefore corium jet breakup behavior could be affected by these CRGTs. Thus, it is important to investigate CRGTs effe...
英字タイトル:
Experimental investigation on jet breakup behavior in the lower plenum of a boiling water reactor under isothermal conditions

Containment spray cooling is a part of nuclear reactor safety system, which can condense the steam into liquid within the containment structure to realize depressurization and temperature decrease during a reactor accident. In order to investigate the space spray mechanism, which is the heat and mass transfer between falling droplets and surrounding gas, 2-D temperature distribution and velocity field inside a suspended water droplet in upward hot air stream was measured using combined temperature-sens...
英字タイトル:
Simultaneous Velocity and Temperature Measurements inside Suspended Droplet in Hot Air Flow using TSPs & PIV

After Fukushima Daiich Accident, some international organizations have been discussed on importance of defense in depth (DiD), total comprehensive evaluation contained 14 Safety Factors in PSR (IAEA SSG-25) and HOF (Human and Organization Factors). The NRA allowed review by the IAEA Integrated Regulatory Review Service (IRRS) mission team, over the twice of 2008 and 2016. As a few recommendation examples on above these points to NRA, acquisition of human resources as able talented person and personnel...
英字タイトル:
Human resource Development Activities lesson learned International standard after Fukushima Daiichi Accident towards a Proactive Nuclear Regulatory