Steam Generator Feedwater Pumps (FW-P-1A and FW-P-1B) were in service, Condensate Booster Pumps (CO-P-2A, CO-P-2B and CO-P-2C) were in service, and Condensate Pumps (CO-P-1A and CO-P-1B) were in service. An attempt was being made to clear a clogged resin transfer line in the standby demineralizer. -00:00:01 Condensate Pump A (CO-P-1A) stopped. (0400:36) -00:00:01 Feedwater Pumps (FW-P-1A and FW-P-1B) stopped at essentially the (0400:36) same time resulting in a loss of feedwater flow to both steam generators. 00:00:00 Main Generator was tripped followed by a turbine trip. (0400:37) 00:00:00 Three Emergency Feedwater Pumps (EF-P-1, 2A, 2B) started. (0400:37) 00:00:03 The Electromatic Relief Valve (RC-RV2) opened at the setpoint (0400:40) Approximate of 2255 psig. 00:00:08 Reactor tripped on high pressure at 2345 psi. Setpoint is 2355 psi. (0400:45) 00:00:08 The operator placed the Pressurized Spray Valve (RC-V1) and pres- (0400:45) Approximate surizer heaters under automatic control. 00:00:13 The operator started the Reactor Coolant Makeup Pump A (MU-P-1A), opened High Pressure Injection Isolation Valve A (MU-V16A) and isolated letdown flow in anticipation of the expected pressurizer level decrease.
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