ENS 42254: Difference between revisions
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| event date = 01/12/2006 09:20 EST | | event date = 01/12/2006 09:20 EST | ||
| last update date = 01/12/2006 | | last update date = 01/12/2006 | ||
| title = Control Room Air Conditioning | | title = Control Room Air Conditioning and Control Room Emergency Ventilation Systems Inoperable | ||
| event text = At 0400 hours on January 12, 2006, 2A Control Building Standby Instrument Air Compressor was taken out of service for scheduled maintenance. Subsequently, at 0920 hours, the in-service 2B Control Building Standby Instrument Air Compressor failed, resulting in the 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 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. The Control Room AC and CREV systems became inoperable due to loss of control air to the systems. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered TS 3.7.3 Required Action B.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 0400 hours on January 12, 2006, 2A Control Building Standby Instrument Air Compressor was taken out of service for scheduled maintenance. Subsequently, at 0920 hours, the in-service 2B Control Building Standby Instrument Air Compressor failed, resulting in the 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 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. The Control Room AC and CREV systems became inoperable due to loss of control air to the systems. Because Brunswick has a shared control room, Unit 1 and Unit 2 entered TS 3.7.3 Required Action B.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 1014 hours, when the 2A Control Building Standby Instrument Air Compressor was restored to service. [The licensee stated the actual maintenance was completed on 2A Control Building Standby Instrument Air Compressor at the time it was restored to service.] | Operability of two Control Room AC subsystems and one CREV subsystem was restored and LCO 3.0.3 was exited, at 1014 hours, when the 2A Control Building Standby Instrument Air Compressor was restored to service. [The licensee stated the actual maintenance was completed on 2A Control Building Standby Instrument Air Compressor at the time it was restored to service.] | ||
Latest revision as of 22:19, 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-2006-001 |
| Time - Person (Reporting Time:+1.78 h0.0742 days <br />0.0106 weeks <br />0.00244 months <br />) | |
| Opened: | Dave Jester 16:07 Jan 12, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Jan 12, 2006 |
| 42254 - NRC Website
| |
Brunswick with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |