ENS 51459
ENS Event | |
|---|---|
00:30 Oct 8, 2015 | |
| Title | Secondary Containment Rendered Inoperable |
| Event Description | At 1930 [CDT] on 10-7-2015, GGNS [Grand Gulf Nuclear Station] identified that on October 1, 2015, Secondary Containment was inoperable between 0324 and 0440 and therefore could have prevented fulfillment of its safety function. That event is being reported under 10 CFR 50.72(b)(3)(v)(c), as any event or condition that, at the time of discovery, could have prevented the fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material.
During the Standby Gas Treatment drawdown surveillance performed October 1, 2015, Secondary Containment failed technical specification required average enclosure building pressure of less than or equal to -0.311 water gauge at 0324 [CDT] (LCO-1-TS-15-0360 entered). Secondary Containment has two boundaries that can be separately credited for meeting the Tech Spec requirements of TS 3.6.4.1. Two inner doors are required to be open during the surveillance in order to test the outer door. While open, those inner doors were attended by Security personnel provided with communications capability. Following completion of the surveillance, Secondary Containment was returned to operable status at 0440 on 10/1/15 by closing the inner doors and maintaining them closed. A subsequent Standby Gas Treatment drawdown surveillance test on October 6, 2015, was performed satisfactorily. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+-1.72 h-0.0717 days <br />-0.0102 weeks <br />-0.00236 months <br />) | |
| Opened: | David Burrus 22:47 Oct 7, 2015 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Oct 7, 2015 |
| 51459 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |