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On Thursday June 5, 2008 at 2356 MST Palo … On Thursday June 5, 2008 at 2356 MST Palo Verde Nuclear Station Unit 1 initiated a normal reactor shutdown to comply with condition C of Technical Specification (TS) LCO 3.5.1 and to facilitate a weld repair on a nitrogen leak found on the Safety Injection Tank (SIT) 1A vent line.</br>LCO 3.5.1 requires that all four SITs be operable in Modes 1 and 2. On June 5, 2008, at 0225 hours MST, Unit 1 entered Condition B which provides allowance for one SIT to be inoperable for a 24 hour period. The SIT will not be restored to operable status within the TS required 24 hour period, therefore, Condition C will be applicable at 0225 MST on June 6 2008. Condition C requires shutdown to Mode 3 in six hours and to reduce pressurizer pressure to less than 1837 psia within 12 hours. </br> </br>On June 06 at 0148 hours MST, Unit 1 was manually tripped from approximately 20% power. The shutdown did not result in a release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public. The primary plant is being stabilized in Mode 3 in forced circulation with both steam generators used for heat removal. Unit 1 is stable at normal operating temperature and pressure in Mode 3.</br>S/G's are being feed via main feed. All other safety related systems are operable. Decay heat is via SBC system to the condenser. There is no impact on the other units. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
06:56:00, 6 June 2008 +
44,274 +
05:40:00, 6 June 2008 +
06:56:00, 6 June 2008 +
On Thursday June 5, 2008 at 2356 MST Palo … On Thursday June 5, 2008 at 2356 MST Palo Verde Nuclear Station Unit 1 initiated a normal reactor shutdown to comply with condition C of Technical Specification (TS) LCO 3.5.1 and to facilitate a weld repair on a nitrogen leak found on the Safety Injection Tank (SIT) 1A vent line.</br>LCO 3.5.1 requires that all four SITs be operable in Modes 1 and 2. On June 5, 2008, at 0225 hours MST, Unit 1 entered Condition B which provides allowance for one SIT to be inoperable for a 24 hour period. The SIT will not be restored to operable status within the TS required 24 hour period, therefore, Condition C will be applicable at 0225 MST on June 6 2008. Condition C requires shutdown to Mode 3 in six hours and to reduce pressurizer pressure to less than 1837 psia within 12 hours. </br> </br>On June 06 at 0148 hours MST, Unit 1 was manually tripped from approximately 20% power. The shutdown did not result in a release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public. The primary plant is being stabilized in Mode 3 in forced circulation with both steam generators used for heat removal. Unit 1 is stable at normal operating temperature and pressure in Mode 3.</br>S/G's are being feed via main feed. All other safety related systems are operable. Decay heat is via SBC system to the condenser. There is no impact on the other units. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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