ENS 50662
ENS Event | |
|---|---|
23:25 Dec 9, 2014 | |
| Title | Non-Functional Fire Barrier Discovered Affecting Both Safe Shutdown Paths |
| Event Description | During an inspection of a fire penetration between Fire Area 1404, Switchgear Room 1G and Fire Area 1408, Switchgear Room 1F in the diesel generator building, the penetration was determined to be non-functional as a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire barrier. In the event of a postulated fire in the affected areas, both safe shutdown paths on Unit 1 could be compromised. Given this information, the determination was made that this condition meets the reporting criteria of 10 CFR 50.72(b)(3)(ii)(B).
Compensatory measures were established in accordance with the plant's Fire Hazard Analysis (FHA). The presence of the compensatory measures in addition to automatic fire detection in the fire areas ensure that the safe shutdown paths are preserved until the degraded condition can be repaired. [Condition report No.] CR904013 The licensee notified the NRC Resident Inspector
Further investigation revealed that after removing the outermost two inches of loose silicone foam material, and taking additional measurements there remained adequate silicone foam material to provide 10 inches of silicone foam sealing the penetration. Plant design shows that the wall in question is 18 inches thick and also that 9 inches of silicone foam is required in the penetration in order maintain a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire rating for the wall/penetration. Since there is adequate foam in the penetration to maintain the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire rating the penetration is fully functional. Based on this information, this penetration in its 'as found' state does NOT represent a condition that seriously degrades a principal safety barrier. As such this condition has been determined to no longer meet reporting requirement 10CFR50.72(b)(3) and is therefore NOT reportable. Based on this information the previous notification for Event 50662 is being retracted. The licensee notified the NRC Resident Inspector. Notified R2DO (Bartley) |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-3.38 h-0.141 days <br />-0.0201 weeks <br />-0.00463 months <br />) | |
| Opened: | Stanley Stone 20:02 Dec 9, 2014 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Dec 30, 2014 |
| 50662 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 526502017-03-30T13:22:00030 March 2017 13:22:00
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