Life cycle stages decommissioning

A checklist analysis (CCPS, 1992) verifies the status of a system. It is versatile, easy and applicable at any life-cycle stage of a process. It is primarily used to show compliance with standards and practices by cost-effectively identifying hazards, chlorine Tar> <- liccklists provide commonality for management K.-, icw of hazard assessments. It may be used for controlling a proces.s from development to decommissioning. Approvals by appropriate authorities Cl i( V each stage of a project. 

A timeline aims to review a series of ordered events that occur in the life cycle of an entity under study. The entity is a subject that carries a certain function the user needs and has its own life cycle, e.g. a system, a subsystem, a component, a software module, or a variable. The timeline for a system could be the whole product life-cycle or part of it, e.g. its development process, or its installation, operation and decommissioning process. The decomposition of a safety claim is realized by considering the claim at different stages in a timeline. The argument over a system task profile is also an example of the argument over a timeline. 

It lists the main requirements to the work to be carried out after the NPP final shutdown, which Is necessary to make their decommissioning easier, at design stage In particular, as well as the requirements to designing and engineering to facilitate the work at the last stages of an NPP life cycle (Flg.1). 

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