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At 1259 hours on June 3, 2008, the Control … At 1259 hours on June 3, 2008, the Control Room authorized replacement of solenoid valve 1-VA-SV-928, affecting the Unit 1 Cable Spread Room Supply / Exhaust Fan Dampers. This work rendered two subsystems of the Control Room Emergency Ventilation (CREV) system inoperable. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered Technical Specification (TS) 3.7.3, 'Control Room Emergency Ventilation (CREV) System,' Required Action 5.1 (i.e., be in Mode 3 within 12 hours).</br>At 1313 hours the three Control Room Air Conditioning subsystems, required by TS 3.7.4, 'Control Room Air Conditioning (AC) System,' tripped during the performance of this planned preventive maintenance activity. Unit 1 and Unit 2 entered TS 3.7.4, Required Action E.1 (i.e., enter LC0 3.0.3 immediately). At 1325 hours, following replacement of solenoid valve 1-VA-SV-928, the Control Room AC subsystems were restored to operable status and LCO 3.0.3 was exited. CREV system operability was restored at 1333 hours.</br>No power reduction took place as a result of the LCO 3.0.3 entry. This report applies to both Units 1 and 2 and is being made in accordance with 10 CFR 50.72(b)(3)(v)(D), as a condition that at the time of discovery could have prevented the fulfillment of the safety function of a system needed to mitigate the consequences of an accident.</br>The safety significance of this event is considered minimal. The condition existed for 12 minutes. Prior to the maintenance activity, the potential for loss of the Control Room AC system and established compensatory actions to be taken in the event of the loss were briefed. Plant staff took immediate actions to return the Control Room AC subsystems to service. For the brief time the Control Room subsystems were inoperable, performance of plant personnel and equipment in the Control Room was not adversely affected. The maximum Control Room back panel temperature during this event was approximately 73 degrees F.</br>Operability of the Control Room AC system was restored at 1325 hours, following replacement of solenoid valve 1-VA-SV-928. CREV system operability was restored at 1333 hours. Further solenoid valve replacements affecting Control Building Emergency Ventilation have been placed on hold pending the completion of the loss of Control Room AC subsystem investigation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.
17:13:00, 3 June 2008 +
44,262 +
19:26:00, 3 June 2008 +
17:13:00, 3 June 2008 +
At 1259 hours on June 3, 2008, the Control … At 1259 hours on June 3, 2008, the Control Room authorized replacement of solenoid valve 1-VA-SV-928, affecting the Unit 1 Cable Spread Room Supply / Exhaust Fan Dampers. This work rendered two subsystems of the Control Room Emergency Ventilation (CREV) system inoperable. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered Technical Specification (TS) 3.7.3, 'Control Room Emergency Ventilation (CREV) System,' Required Action 5.1 (i.e., be in Mode 3 within 12 hours).</br>At 1313 hours the three Control Room Air Conditioning subsystems, required by TS 3.7.4, 'Control Room Air Conditioning (AC) System,' tripped during the performance of this planned preventive maintenance activity. Unit 1 and Unit 2 entered TS 3.7.4, Required Action E.1 (i.e., enter LC0 3.0.3 immediately). At 1325 hours, following replacement of solenoid valve 1-VA-SV-928, the Control Room AC subsystems were restored to operable status and LCO 3.0.3 was exited. CREV system operability was restored at 1333 hours.</br>No power reduction took place as a result of the LCO 3.0.3 entry. This report applies to both Units 1 and 2 and is being made in accordance with 10 CFR 50.72(b)(3)(v)(D), as a condition that at the time of discovery could have prevented the fulfillment of the safety function of a system needed to mitigate the consequences of an accident.</br>The safety significance of this event is considered minimal. The condition existed for 12 minutes. Prior to the maintenance activity, the potential for loss of the Control Room AC system and established compensatory actions to be taken in the event of the loss were briefed. Plant staff took immediate actions to return the Control Room AC subsystems to service. For the brief time the Control Room subsystems were inoperable, performance of plant personnel and equipment in the Control Room was not adversely affected. The maximum Control Room back panel temperature during this event was approximately 73 degrees F.</br>Operability of the Control Room AC system was restored at 1325 hours, following replacement of solenoid valve 1-VA-SV-928. CREV system operability was restored at 1333 hours. Further solenoid valve replacements affecting Control Building Emergency Ventilation have been placed on hold pending the completion of the loss of Control Room AC subsystem investigation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.
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