The Salem nuclear plant in New Jersey was forced to scram the Unit 1 reactor after one of its circulating water pumps became fouled by grass in the intake. When this pump shut down, it resulted in another operating pump receiving a surge of grass, which caused that pump to shut down, necessitating a manual reactor trip. (Two other pumps were already out-of-service for maintenance.)
The shutdown was not without incident: One of the steam generators dropped below the lowest allowable set points. This resulted in activation of two of the motor-driven Auxilliary Feedwater Pumps.
Salem Unit 1 remains shut, according to the NRC’s Reactor Status report. Unit 2 is off-line for scheduled maintenance.