Abstract
Ten years have passed since the Great East Japan Earthquake and the subsequent accident at the Fukushima Daiichi nuclear power plant (NPP) that occurred on March 11, 2011. The earthquake and tsunami caused significant loss of lives and widespread disaster in Japan. Several reports have been published on the nuclear accident; however, the original data released at the beginning of the accident were written in Japanese, and some of these documents are no longer accessible. Some of the scenarios pertaining to the accident have become standardized theories, and these scenarios may be passed down to future generations with different descriptions, which may not fully describe the actual occurrences. To prevent future nuclear accidents, the accident at Fukushima Daiichi must be properly understood and analyzed.
Highlights
Ten years have passed since the Great East Japan Earthquake and the subsequent accident at the Fukushima Daiichi nuclear power plant (NPP)
When meter and the pressure data measured during the accident. the author returned to his home in Sendai city, he Further more, based on the temperature data of various measuring points and the estimated accident scenario of Unit 1, we presented a bold estimation of the locations and times of damages in the reactor pressure vessel (RPV) and primary containment vessel (PCV)
Note that the analysis according to the adiabatic expansion model does not give anaccurate estimation when the water level is below the top of active fuel (TAF), and the RPV is filled with superheated vapor
Summary
Ten years have passed since the Great East Japan Earthquake and the subsequent accident at the Fukushima Daiichi nuclear power plant (NPP). Unit 2: According to the report of TEPCO [6], the RCIC repeated an automatic stop function owing to water level in the RPV and manual restarting was performed before the tsunami attack. In the previous analysis of Unit 1 [HTC Rep.26.1 2013/02/10], [9], we constructed an accident scenario where IC-A was functional after the tsunami attack, and a small leak through a rupture with the equivalent diameter of dRPV = 0.86cm occurred immediately after. According to the analysis of the water level approximate diameter dRPV = 1.7 cm to adjust for the meter [HTC Rep.32.2, 2014/03/05], the water injection measured PCV pressure data.
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