ENS 47493: Difference between revisions
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| event date = 12/01/2011 13:44 EST | | event date = 12/01/2011 13:44 EST | ||
| last update date = 12/01/2011 | | last update date = 12/01/2011 | ||
| title = Control Room Air Conditioning | | title = Control Room Air Conditioning and Control Room Emergency Ventilation Systems Inoperable | ||
| event text = At 1344 hours (EST) on December 1, 2011, the Control Building Instrument Air Dryer failed resulting in loss of control air. As a result, the three Control Room Air Conditioning subsystems required by Technical Specification (TS) 3.7.4, 'Control Room Air Conditioning (AC) System,' and the two Control Room Emergency Ventilation [CREV] subsystems required by TS 3.7.3, 'Control Room Emergency Ventilation (CREV) System,' became inoperable. As a result, this condition could have prevented the fulfillment of the safety function for these systems. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered TS 3.7.3 Required Action C.1, for two CREV subsystems inoperable (i.e., be in Mode 3 within 12 hours) and TS 3.7.4, Required Action E.1, for three Control Room AC subsystems inoperable (i.e., enter LCO 3.0.3 immediately). | | event text = At 1344 hours (EST) on December 1, 2011, the Control Building Instrument Air Dryer failed resulting in loss of control air. As a result, the three Control Room Air Conditioning subsystems required by Technical Specification (TS) 3.7.4, 'Control Room Air Conditioning (AC) System,' and the two Control Room Emergency Ventilation [CREV] subsystems required by TS 3.7.3, 'Control Room Emergency Ventilation (CREV) System,' became inoperable. As a result, this condition could have prevented the fulfillment of the safety function for these systems. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered TS 3.7.3 Required Action C.1, for two CREV subsystems inoperable (i.e., be in Mode 3 within 12 hours) and TS 3.7.4, Required Action E.1, for three Control Room AC subsystems inoperable (i.e., enter LCO 3.0.3 immediately). | ||
Operability of two Control Room AC subsystems and one CREV subsystem was restored and LCO 3.0.3 was exited, at 1410 hours, when the Instrument Air Dryer was bypassed. | Operability of two Control Room AC subsystems and one CREV subsystem was restored and LCO 3.0.3 was exited, at 1410 hours, when the Instrument Air Dryer was bypassed. | ||
Latest revision as of 21:05, 1 March 2018
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000325/LER-2011-003 |
| Time - Person (Reporting Time:+-2.65 h-0.11 days <br />-0.0158 weeks <br />-0.00363 months <br />) | |
| Opened: | Mike Odell 16:05 Dec 1, 2011 |
| NRC Officer: | Vince Klco |
| Last Updated: | Dec 1, 2011 |
| 47493 - NRC Website
| |
Brunswick with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |