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Fusion Science and Technology
Fukiushima Daiichi: 10 years on
The Fukushima Daiichi site before the accident. All images are provided courtesy of TEPCO unless noted otherwise.
It was a rather normal day back on March 11, 2011, at the Fukushima Daiichi nuclear plant before 2:45 p.m. That was the time when the Great Tohoku Earthquake struck, followed by a massive tsunami that caused three reactor meltdowns and forever changed the nuclear power industry in Japan and worldwide. Now, 10 years later, much has been learned and done to improve nuclear safety, and despite many challenges, significant progress is being made to decontaminate and defuel the extensively damaged Fukushima Daiichi reactor site. This is a summary of what happened, progress to date, current situation, and the outlook for the future there.
Jason Oakley, Mark Anderson, Ed Marriott, Jesse Gudmundson, Kumar Sridharan, Virginia Vigil, Gary Rochau, Riccardo Bonazza
Fusion Science and Technology | Volume 52 | Number 4 | November 2007 | Pages 943-947
Technical Paper | Inertial Fusion Technology: Drivers and Advanced Designs | dx.doi.org/10.13182/FST07-A1615
Articles are hosted by Taylor and Francis Online.
A liquid pool, with and without void fractions, was subjected to dynamic compression testing in a vertical shock tube to model the bubbly-pool concept being considered for use in an inertial fusion energy reactor. Water and oil were used to model the FliBe coolant that collects at the bottom of the chamber and serves as first wall protection at that location. The experiments (shock strengths M = 1.4, 2.0, and 3.1) were conducted in atmospheric pressure argon, and argon was bubbled through the liquid to achieve void fractions of 5-15% in the 30.4 cm deep pool. Pressure measurements were taken in the pool at intervals of 2.54 cm to measure the effect of void fraction on the pool compression and the compression wave traveling through the liquid. The presence of the gas voids in the liquid had a strong effect on the dynamic pressure loading but did not reduce the shock impulse significantly at the low and intermediate Mach numbers, but did exhibit a mitigating effect at the higher shock strength. A very high void fraction foam was also studied that resulted in a 22% reduction of the shock wave impulse.