Heat transfer systems and methods for nuclear plants

A heat transfer system (400) for a nuclear plant may include a piping system (418) that includes first and second connectors (414, 416), heat exchanger (406), pump (402), and power source (420). The heat transfer system (400) may not be connected to the plant during normal power operations. The power source (420) may be independent of a normal electrical power distribution system for the plant and may be configured to power the pump (402). The piping system (418) may be configured to connect the heat exchanger (406) and pump (402). The connectors (414, 416) may be configured to connect the heat transfer system (400) to a fluid system (500, 600) of the plant. When the connectors connect the heat transfer system (400) to the fluid system, the heat transfer system (400) may be configured to receive fluid from the fluid system (500, 600) of the plant via the first connector (414), to pump the fluid through the heat exchanger (406), and to return the fluid to the fluid system (500, 600) via the second connector (416).