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At 1506 on Sunday, July 26, 2009, the Cook … At 1506 on Sunday, July 26, 2009, the Cook Nuclear Plant (CNP) Unit 2 reactor was manually tripped after the control room staff concluded that the #22 Reactor Coolant Pump (RCP) needed to be promptly secured due to a RCP seal malfunction as indicated by lowering #1 seal leakoff flows and rising #1 seal return and pump radial bearing temperature. This requires a 4-hour report under 10CFR50.72(b)(2)(iv)(B).</br>Both motor-driven Auxiliary Feedwater pumps automatically started due to the reactor trip and trip of both Main Feedwater Pumps. The Turbine-Driven Auxiliary Feedwater Pump (TDAFP) started automatically due to low-low water levels in at least two steam generators, which is expected for a reactor trip from approximately full power. The automatic actuation of the reactor protection system and the TDAFP require an 8-hour report under 10CFR50.72(b)(3)(iv)(A).</br>All systems functioned as expected after the trip, and no major components were out of service at the time except for the Moisture Separator Reheaters which were not in service since the beginning of the current power cycle.</br>The licensee has notified the NRC Senior Resident Inspector.</br>All control rods fully inserted as required. Electrical system is in normal post-trip lineup. Plant cooldown is via Condenser Steam Dumps using Auxiliary Feedwater pumps. Plant cooldown will continue to Mode 5 (cold shutdown).n will continue to Mode 5 (cold shutdown). +
19:06:00, 26 July 2009 +
45,228 +
18:44:00, 26 July 2009 +
19:06:00, 26 July 2009 +
At 1506 on Sunday, July 26, 2009, the Cook … At 1506 on Sunday, July 26, 2009, the Cook Nuclear Plant (CNP) Unit 2 reactor was manually tripped after the control room staff concluded that the #22 Reactor Coolant Pump (RCP) needed to be promptly secured due to a RCP seal malfunction as indicated by lowering #1 seal leakoff flows and rising #1 seal return and pump radial bearing temperature. This requires a 4-hour report under 10CFR50.72(b)(2)(iv)(B).</br>Both motor-driven Auxiliary Feedwater pumps automatically started due to the reactor trip and trip of both Main Feedwater Pumps. The Turbine-Driven Auxiliary Feedwater Pump (TDAFP) started automatically due to low-low water levels in at least two steam generators, which is expected for a reactor trip from approximately full power. The automatic actuation of the reactor protection system and the TDAFP require an 8-hour report under 10CFR50.72(b)(3)(iv)(A).</br>All systems functioned as expected after the trip, and no major components were out of service at the time except for the Moisture Separator Reheaters which were not in service since the beginning of the current power cycle.</br>The licensee has notified the NRC Senior Resident Inspector.</br>All control rods fully inserted as required. Electrical system is in normal post-trip lineup. Plant cooldown is via Condenser Steam Dumps using Auxiliary Feedwater pumps. Plant cooldown will continue to Mode 5 (cold shutdown).n will continue to Mode 5 (cold shutdown). +
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