What action is necessary to mechanically isolate equipment during decommissioning?

Mechanically isolating equipment during decommissioning is a critical step to ensure safety and prevent any accidental operation or release of hazardous materials. Physical disconnection involves physically removing connections, such as piping, electrical connections, or other interfaces that enable the equipment to operate or interact with other systems. This action creates a clear barrier that ensures the equipment cannot be unintentionally activated or cause harm to personnel or the environment during the decommissioning process.

Other options, while related to safety, do not achieve the same level of isolation as physical disconnection. For instance, cutting power can prevent the equipment from operating but does not eliminate the potential for stored energy or residual materials that could pose risks. Reinstallation does not apply to the decommissioning context, as it implies putting equipment back into operation rather than shutting it down. Enhancing security focuses on preventing unauthorized access, which, while important, does not provide the mechanical isolation needed during the decommissioning process.