Company Filing History:
20 out of 42,496 
3 out of 162 
1 out of 193 
Years Active: 1988-1999
Title: Innovations of Junjiro Nakajima: A Pioneer in Nuclear Reactor Technology
Introduction: Junjiro Nakajima, an esteemed inventor located in Hitachi, Japan, has made significant contributions to the field of nuclear reactor technology. With 20 patents to his name, Nakajima's work is characterized by innovative solutions that address the complexities of nuclear fuel assembly and materials.
Latest Patents: Among his most recent inventions are two noteworthy patents. The first, "Fuel assembly channel box having burnable poison," describes a channel box designed for nuclear-reactor fuel assemblies. This invention utilizes MOX fuel containing plutonium, ensuring proper control of excess reactivity without the need to mix neutron absorbers or burnable poisons into the fuel rods. Furthermore, it aims to eliminate gaps between the channel box and the burnable poison-containing members, ensuring that burnable poison does not directly contact reactor water.
The second patent, "Zirconium based alloy of low irradiation growth, method of producing the," focuses on creating a zirconium-based alloy member that minimizes deformation due to irradiation growth. This alloy is crucial for maintaining the integrity of reactor components, specifically in channel boxes for atomic reactor fuel assemblies. The alloy is characterized by its unique composition, including controlled amounts of niobium and tin, as well as specific orientation properties to reduce bowing during neutron irradiation.
Career Highlights: Throughout his career, Nakajima has been associated with prominent companies, specifically Hitachi, Ltd. and Hitachi Engineering Co., Ltd. His work at these organizations has been integral in pushing the boundaries of nuclear reactor technology and enhancing safety standards.
Collaborations: Nakajima has collaborated with notable colleagues in the industry, including Masahisa Inagaki and Koji Nishida. Together, they have contributed to the advancement of innovative solutions that address the ongoing challenges in nuclear energy and materials science.
Conclusion: Junjiro Nakajima's contributions through his patents demonstrate his commitment to improving nuclear reactor technology. His inventions not only reflect his innovative spirit but also highlight the importance of collaboration in achieving significant advancements in the field. As the energy landscape continues to evolve, Nakajima's work will undoubtedly play a crucial role in shaping the future of nuclear energy solutions.