ENS 42488
ENS Event | |
|---|---|
20:30 Apr 10, 2006 | |
| Title | Control Room Emergency Ventilation System Declared Inoperable Due to Design Deficiency |
| Event Description | EVENT DESCRIPTION:
At 1630 on 4/10/06, plant personnel identified a potential failure mode of the recently modified chlorine detectors. The failure mode has the potential to render the Control Room Emergency Ventilation (CREV) system inoperable following power restoration after a LOOP/LOCA event. Due to this design deficiency, the CREV system was declared inoperable per LCO 3.7.3, Control Room Emergency Ventilation System, which placed both units in LCO 3.7.3 Condition B. Required Actions for this Condition are to be in Hot Shutdown in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Cold Shutdown in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. In addition TRM [Technical Reference Manual] 3.18, CREV Smoke Protection Mode, is being entered for Condition B. The Plan required by TRM 3.18 Condition B is to remove the Chlorine Tank Car from site AND to disable the Chlorine detectors to prevent them from actuating. These actions were completed at 2100 on 4/10/06 and the CREV System Rad/Smoke Mode was restored to operable. This situation has been evaluated as reportable to the NRC within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per 0OI-01.07, Attachment 1. The criteria is 10CFR50.72 (b)(3)(v)(D). The condition at the time of discovery that could have prevented the fulfillment of safety function of structures or systems that are needed to mitigate the consequences of an accident. (Item # 3.4.4 of 0OI-01.07 Attachment1). INITIAL SAFETY SIGNIFICANCE EVALUATION: The initial safety significance of this event is considered minimal due to the immediate implementation of Tech Spec and TRM required actions following discovery of the design deficiency. CORRECTIVE ACTIONS: The Plan required by TRM 3.18 Condition B is to remove the Chlorine Tank Car from site AND to disable the Chlorine detectors to prevent them from actuating. These actions were completed at 2100 on 4/10106 and the CREV System Rad/Smoke Mode was restored to operable. The Chlorine Tank Car will remain off-site and the Chlorine detectors will remain disabled until the design deficiency is corrected. The deficiency with the chlorine detectors which had been modified in February 2006 was identified using the plant simulator. The licensee informed the NRC Resident Inspector. |
| 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-2006-003 |
| Time - Person (Reporting Time:+3.05 h0.127 days <br />0.0182 weeks <br />0.00418 months <br />) | |
| Opened: | Dave Jester 23:33 Apr 10, 2006 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Apr 10, 2006 |
| 42488 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (95 %) |
| After | Power Operation (95 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Brunswick with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 559972022-07-16T00:20:00016 July 2022 00:20:00
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