ENS 42943
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ENS Event | |
|---|---|
22:09 Oct 28, 2006 | |
| Title | |
| Event Description | An 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> notification per 10 CFR 50.72(b)(3)(ii)(B) is being made due to discovery of a previously unanalyzed plant condition. The chemical volume control system (CVCS) charging line is a high energy line susceptible, within design space, to a rupture that could result in pipe whip and an impingement condition. The containment penetration (M-3) for the charging line is directly below the high-pressure safety injection (HPSI) header penetrations (M-5 & M-6). Due to this proximity, a failure of the charging line could impact the SI-1503 class HPSI line (M-6) causing damage to the header and rendering it incapable of fulfilling its design function. The two HPSI headers are different class piping with the M-5 penetration being a 2500 psig (SI - 2501 Class) line and the M-6 penetration being a 1500 psig (SI-1503 Class) line. The 2500 psig line is constructed of robust enough piping to not be susceptible to failure, however both HPSI headers are cross connected prior to location of concern. Although both HPSI and CVCS breaks are isolable, operator action would be required to identify and isolate the break location. The possible result of a high energy line break of charging piping could result in all three pipe headers being inoperable until manual action could be taken to isolate leakage on the 1500 psig HPSI line. Plant is currently shutdown for refueling outage with scheduled startup of November 21, 2006.
The licensee notified the NRC Resident Inspector.
Additional review of the stations design and licensing basis has determined that the charging and high pressure safety injection systems are correctly designed to the stations high energy line break criteria for lines inside containment. This situation is not reportable and therefore event notification 42943 is being withdrawn. The licensee notified the NRC Resident Inspector. Notified R4DO (Clark) |
| Where | |
|---|---|
Ft Calhoun  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.28 h-0.0117 days <br />-0.00167 weeks <br />-3.83544e-4 months <br />) | |
| Opened: | Rich Lowery 21:52 Oct 28, 2006 |
| NRC Officer: | Bill Gott |
| Last Updated: | Nov 7, 2006 |
| 42943 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Refueling Shutdown (0 %) |
| After | Refueling Shutdown (0 %) |
WEEKMONTHYEARENS 522012016-08-25T20:23:00025 August 2016 20:23:00
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