What is the primary role of the RDO during port watch?

The primary role of the Reactor Watch Officer (RDO) during port watch is to serve as the commissioned officer in charge. This position entails oversight of all operational activities related to the reactor plant while the ship is in port. The RDO is responsible for ensuring that all safety protocols are followed and that the reactor systems are being monitored correctly during these times.

In addition to direct supervision, the RDO must also communicate effectively with other watchstanders and assess the situation to make informed decisions regarding reactor operations. This role is critical for maintaining both the safety of personnel and the integrity of reactor operations, providing leadership and a point of authority during port watch.

The other options, while important to reactor operations, do not encapsulate the primary responsibility of the RDO in this context. The RDO's role encompasses a broader spectrum of accountability that goes beyond handling specific systems or monitoring environmental conditions.