What is the primary duty of the sub reactor controls assistant (RCA)?

The primary duty of the sub reactor controls assistant (RCA) is centered around the maintenance and operation of the reactor plant protective equipment. This responsibility is critical because reactor plant protective systems are designed to ensure the safety and security of the nuclear reactor environment. Proper maintenance of these systems is vital for monitoring reactor conditions, responding to operational anomalies, and preventing incidents that could jeopardize the safety of the crew and the integrity of the vessel.

In contrast to the options involving maintenance of mechanical systems, management of power supplies, or training electrical divisions, the focus of the RCA is specifically on the protective equipment associated with the reactor. This includes ensuring that systems such as alarms, shutdown mechanisms, and other safety-related devices are functioning correctly and are regularly tested to comply with safety protocols. Thus, the RCA plays a crucial role in maintaining the safety frameworks that protect both personnel and the operational capabilities of the submarine's reactor.