Which of the following is NOT one of the three areas of the nuclear plant?

The three primary areas of a nuclear plant typically include the Owner Controlled Area, the Protected Area, and the Vital Area. Each of these areas has specific security measures and access controls, designed to ensure the safety and security of the plant's operations and assets.

The Owner Controlled Area is where the responsible entity has the authority to manage and control access, ensuring that all operations comply with safety protocols. The Protected Area is a zone where additional security measures are implemented to prevent unauthorized access and safeguard nuclear materials. The Vital Area is the most secure part of the plant, where critical systems and sensitive information are located, necessitating the highest level of security scrutiny.

By understanding these definitions and their purposes, it becomes clear why the Restricted Area is not categorized among the primary areas of a nuclear plant. While there may be zones within a nuclear facility that could be described as restricted in terms of access due to particular hazards or operational protocols, it does not align with the established tripartite structure of plant areas that focuses specifically on ownership and security protocols critical to nuclear operations.