filtering systems and methods remove debris from coolant in a nuclear reactor setting . one or more filters are installed outside coolant reservoirs specifically where coolant will flow toward the reservoir , such as during a transient or other coolant leak event . useable filters permit coolant through - flow while catching , straining , diverting , or otherwise removing debris from the coolant without significant interference with the coolant flow . filters can be installed at any location in a flow path for coolant flowing toward the reservoir , including pipes draining into a suppression pool , floor or personnel platform gratings , areas around main steam legs or steam generators , in a reactor drywell , etc . one or more filters are installed by securing the filter in a coolant flow path into a coolant source . installation and maintenance can be performed during any maintenance period .