What is the primary purpose of the coolant turbine generators?

The primary purpose of coolant turbine generators is to produce electrical power used by the reactor coolant pumps (RCPs). These pumps are essential for circulating the coolant throughout the reactor core, allowing for efficient heat transfer and control of the reactor's operational safety. By generating electricity specifically for the RCPs, the coolant turbine generators ensure that the coolant system operates continuously and reliably, which is vital for maintaining optimal reactor conditions and preventing overheating.

In the context of a nuclear reactor, coolant circulation is crucial because it not only removes heat generated by the fission process but also helps maintain the integrity of the reactor by managing both temperature and pressure within safe operational limits. While other options touch upon related concepts in reactor operation, the singular role of coolant turbine generators in generating power for the RCPs underscores their critical function in nuclear reactor safety and efficiency.