It uses natural circulation, so there are no coolant pumps.

They just didn't count on losing power to their coolant pumps.

It also houses the main coolant pump which is driven through the same gear-train as the oil pumps.

So, say he has two out of four main coolant pumps left.

A high-pitched whine hit their ears as the ferry's coolant pumps started up.

Requires fast speed reactor main coolant pumps and running at 100% reactor power.

Eliminates use of noisy main coolant pumps, allowing quieter operation.

Her small reactor coolant pumps had two speeds: On and Off.

The S5G had primary coolant pumps, but they were only needed for very high speeds.

In most cases the submarine could be operated without using coolant pumps at all.