How tall are the nuclear fuel rods in japan?

There is no information available about the height of nuclear fuel rods in Japan. Nuclear fuel rods are designed and manufactured according to specific reactor requirements and vary depending on the type and design of the reactor. Additionally, the dimensions of nuclear fuel rods can vary across different nuclear power plants and countries based on specific design and safety considerations. Without access to specific information from the relevant authorities or nuclear power plant operators in Japan, it is not possible to provide an accurate answer to this question.