By Joonhong Ahn, Cathryn Carson, Mikael Jensen, Kohta Juraku, Shinya Nagasaki, Satoru Tanaka
This e-book specializes in nuclear engineering schooling within the post-Fukushima period. It used to be edited by means of the organizers of the summer time university held in August 2011 in collage of California, Berkeley, as a part of a collaborative software among the collage of Tokyo and UC Berkeley. stimulated through the actual relevance and significance of social-scientific techniques to varied the most important facets of nuclear expertise, distinctive emphasis was once put on integrating nuclear technological know-how and engineering with social technology. The booklet contains the lectures given in 2011 summer season college and extra chapters that hide advancements some time past 3 years because the coincidence. It presents an area for discussions to discover and create a renewed platform for engineering practices, and hence nuclear engineering schooling, that are crucial within the post-Fukushima period for nurturing nuclear engineers who must be either technically powerfuble and relied on in society.
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Additional resources for Reflections on the Fukushima Daiichi nuclear accident : toward social-scientific literacy and engineering resilience
There are many unknown matters concerning the location of debris, and the final status of accident progression. 6 shows the PCV pressure changes. 3). In Unit 2, despite the fact that both AC and DC power were lost due to the tsunami, RCIC continued operation without control for almost 70 h. However, Unit 2 fell into severe accident mode because of lack of water injection. PCV venting was never successful. Hydrogen explosion had not occurred, but FPs were released to the environment. 1 From the Earthquake to Tsunami Arrival At Unit 2, the following operation steps were taken towards cold shutdown: startup and shutdown of the reactor core isolation cooling (RCIC) system,10 start-up of the residual heat removal (RHR) system11 in the S/C cooling mode, etc.
An attempt was made on-site to supply nitrogen gas to drive the SRV via the supply line, but it failed, because the valve on the supply line was an air-driven type and it could not be manually operated due to structural limitations. Further operation attempts also failed to start up the HPCI and RCIC: the HPCI failed due to battery depletion, and the RCIC failed because the turbine trip throttle valve was closed again by its trip mechanism. The measurement of reactor water level was interrupted at 20:36 on March 12 due to loss of power supply.
Consequently, Units 1–3 ultimately experienced severe accidents; although they were successfully shut down, they lost functions related to cooling. On March 11, 2011, Units 1–3 of Fukushima Daiichi NPS were in operation, while Units 4–6 had been shut down for periodic inspection outage. Due to the shock of the Earthquake that occurred at 14:46, the safety function of Units 1–3 was actuated by the seismic over-speed trip signal, which resulted in automatic shutdown of all reactors in operation at the time.
Reflections on the Fukushima Daiichi nuclear accident : toward social-scientific literacy and engineering resilience by Joonhong Ahn, Cathryn Carson, Mikael Jensen, Kohta Juraku, Shinya Nagasaki, Satoru Tanaka