ENS 40724: Difference between revisions
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| event date = 05/04/2004 16:55 EDT | | event date = 05/04/2004 16:55 EDT | ||
| last update date = 05/04/2004 | | last update date = 05/04/2004 | ||
| title = Unanalyzed Condition | | title = Unanalyzed Condition and Potential Loss of Containment Safety Function | ||
| event text = NOTE: Oconee Unit 2 is DEFUELED (No Mode) in a refueling outage. | | event text = NOTE: Oconee Unit 2 is DEFUELED (No Mode) in a refueling outage. | ||
Oconee has discovered a new scenario where the double ended guillotine rupture addressed by IE Bulletin 80-04 is not the worst case with respect to containment pressure following a Main Steam Line Break (MSLB). Therefore this scenario is being reporting as an Unanalyzed Condition and a potential loss of the containment safety function. This new scenario involves a range of MSLB break sizes smaller than the double ended guillotine rupture addressed by IE Bulletin 80-04, with the break located inside containment, and with a concurrent Loss Of Offsite Power (LOOP). | Oconee has discovered a new scenario where the double ended guillotine rupture addressed by IE Bulletin 80-04 is not the worst case with respect to containment pressure following a Main Steam Line Break (MSLB). Therefore this scenario is being reporting as an Unanalyzed Condition and a potential loss of the containment safety function. This new scenario involves a range of MSLB break sizes smaller than the double ended guillotine rupture addressed by IE Bulletin 80-04, with the break located inside containment, and with a concurrent Loss Of Offsite Power (LOOP). | ||
Latest revision as of 22:23, 1 March 2018
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000269/LER-2004-002 |
| Time - Person (Reporting Time:+-1.78 h-0.0742 days <br />-0.0106 weeks <br />-0.00244 months <br />) | |
| Opened: | Randy Todd 19:08 May 4, 2004 |
| NRC Officer: | Arlon Costa |
| Last Updated: | May 4, 2004 |
| 40724 - NRC Website
| |
Oconee with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |