Reactor Safety Criticality Coding for Multi-Unit CANDU NPP Component criticality coding at a Nuclear Power Plant (NPP) Utilities code the components at a NPP in terms of their criticality to Reactor Safety; Production; and Cost, Conventional Safety and the Environment. The coding for each category is combined to create an overall criticality code for a component. The overall criticality code for a component is used to prioritize maintenance activities, procurement and other operational activities. Incorrect riticality coding may result in inappropriate maintenance and procurement strategies for components. This can negatively affect reactor safety and production. Scope of work Kinectrics was asked to rank the components at a multi-unit CANDU NPP using the utility’s reactor safety critical

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