A nuclear reactor module includes a reactor core (6) and a reactor housing (22) that surrounds the reactor core about its sides, wherein the reactor housing is configured to direct coolant (Tc) through the reactor core. A neutron reflector (50) is located between the reactor core and the reactor housing, wherein the neutron reflector has a plurality of inlet ports (IN1, IN2) facing the reactor core. The neutron reflector also has a plurality of outlet ports (OUT) fluidly connected to the inlet ports to direct a portion of the coolant through the neutron reflector.