[en] The report is the third in a series of preparatory documents necessary for accomplishing the ultimate demolition of the 100-F Plutonium Production Reactor and its related facilities. The Disposition Plan and Activities Definition is the key planning document since it is here that the first effort is made to describe the mode to be applied, the end product to be achieved, and the management system to be employed in carrying out the disposition project. The document also identifies the major tasks necessary to accomplish complete dismantlement and demolition of the 100-F Area facilities, and proposed techniques for performing these activities and tasks. Although conceptual, these methods and procedures provide the basis for preparation of the major activity descriptions and detailed work procedure documents