The information required for estimating the dismantling cost includes the unit cost per worker, building information related to the dismantling of the facility, special equipment information for individually evaluating the work required, and waste-related information for calculating the total amount of work. In the manual, methods to obtain this information are explained and a summary datasheet is provided. Here, the necessary information acquired from the Japan Power Demonstration Reactor (JPDR) is summarized. JPDR was the first reactor in Japan to carry out nuclear power generation and was the first facility to demonstrate that we could dismantle and demolish a nuclear reactor.