ENS 43699
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ENS Event | |
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05:14 Oct 7, 2007 | |
Title | Primary Containment Leak Rate Exceeded |
Event Description | At 0114 EDT on 10/7/07, Fermi 2 feed water line check valves, B2100-F010B and B2100-F076B, failed their local leak rate tests. The leakage rate of the inboard check valve (B2100-F010B) was 297.3 SCFH and the leakage rate of the outboard check valve (B2100-F076B) was indeterminate due to leakage exceeding the capability of the leak rate monitor. Thus, the minimum path leakage through penetration X-9B is 297.3 SCFH. This leak rate exceeds the Primary Containment allowable leakage rate (1.0 La) of 296.3 SCFH per Tech. Spec. 5.5.12. The NRC Resident Inspector has been notified of this event.
The licensee is reporting a degraded safety function associated with the primary containment barrier. The licensee intends to repair the leaking valve and retest it prior to any mode change. There is no LCO associated with this condition because the licensee is in mode 5. |
Where | |
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Fermi ![]() Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
LER: | 05000341/LER-2007-001 |
Time - Person (Reporting Time:+0.7 h0.0292 days <br />0.00417 weeks <br />9.5886e-4 months <br />) | |
Opened: | Mike Himebauch 05:56 Oct 7, 2007 |
NRC Officer: | Joe O'Hara |
Last Updated: | Oct 7, 2007 |
43699 - NRC Website
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WEEKMONTHYEARENS 566852023-08-20T20:00:00020 August 2023 20:00:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Shutdown ENS 436992007-10-07T05:14:0007 October 2007 05:14:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Primary Containment Leak Rate Exceeded ENS 424652006-04-01T05:39:0001 April 2006 05:39:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Excessive Check Valve Leakage at a Containment Penetration 2023-08-20T20:00:00 | |
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