Company Filing History:
2 out of 42,508 
1 out of 162 Years Active: 1985-1994
Title: Innovations by Yoshie Takashima in Nuclear Reactor Technology
Introduction
Yoshie Takashima is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of nuclear reactor technology, holding 2 patents that focus on improving safety and efficiency in nuclear power systems.
Latest Patents
One of his latest patents is a "Nuclear reactor power control method and device." This invention involves decreasing the speed of a pump supplying cooling water to the core in a boiling water type nuclear reactor based on a trip signal generated when a pump supplying feed water is tripped. The method performs a first operation to decrease the nuclear reactor power to a first fixed value, followed by a second operation that lowers the power to a second fixed value, preventing the run-out of other first pumps in operation. This innovative approach ensures that the steam flow decreases substantially simultaneously with the decrease of the feed water flow, thereby reducing the possibility of a nuclear reactor scram.
Another significant patent is the "Nuclear reactor degassing method and degassing system." In this invention, control rods are inserted into the core of a nuclear reactor to shut down the reactor output. Before the completion of the entire control rod insertion, a high-temperature coolant is sprayed into the upper portion of the reactor vessel, which is under negative pressure. This process separates oxygen from the water droplets of the sprayed coolant. After the control rod insertion is complete, a residual heat removal system is activated, and a low-temperature coolant is sprayed into the space, ensuring effective cooling and safety.
Career Highlights
Yoshie Takashima has worked with prominent companies such as Hitachi, Ltd. and Hitachi Engineering Co., Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in nuclear technology.
Collaborations
Throughout his career, Takashima has collaborated with notable colleagues, including Yoshiyuki Miyamoto and Fumio Mizuki. These partnerships have contributed to the advancement of his inventions and the overall progress in the field.
Conclusion
Yoshie Takashima's contributions to nuclear reactor technology through his innovative patents demonstrate his commitment to enhancing safety and efficiency in energy production. His work continues to influence the industry and pave the way for future advancements.