ENS 49690: Difference between revisions
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| event date = 01/03/2014 15:00 EST | | event date = 01/03/2014 15:00 EST | ||
| last update date = 01/30/2014 | | last update date = 01/30/2014 | ||
| title = Abgts Potentially Inoperable | | title = Abgts Potentially Inoperable for Both Units Under Worst-Case Conditions | ||
| event text = At 1500 EST on 01/03/2014, TVA determined that during certain conditions, Service Air usage (air used for non-safety related tools/equipment) could result in introducing air into the Auxiliary Building Secondary Containment Enclosure that could, in worst-case conditions, exceed the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable for Sequoyah Units 1 and 2. ABGTS is required to be operable for both units by Technical Specifications. This is an unanalyzed condition that could prevent both trains of ABGTS from performing [their] safety function[s]. Service air has been isolated to the Auxiliary Building and is under administrative controls until further analysis [is] complete. This is additional information discovered during follow-up evaluation regarding the issue identified in LER 50-327/2013-004. Further analysis will be performed to determine safety significance. | | event text = At 1500 EST on 01/03/2014, TVA determined that during certain conditions, Service Air usage (air used for non-safety related tools/equipment) could result in introducing air into the Auxiliary Building Secondary Containment Enclosure that could, in worst-case conditions, exceed the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable for Sequoyah Units 1 and 2. ABGTS is required to be operable for both units by Technical Specifications. This is an unanalyzed condition that could prevent both trains of ABGTS from performing [their] safety function[s]. Service air has been isolated to the Auxiliary Building and is under administrative controls until further analysis [is] complete. This is additional information discovered during follow-up evaluation regarding the issue identified in LER 50-327/2013-004. Further analysis will be performed to determine safety significance. | ||
There is 1600 scfm margin in the ABSGTS. The Service Air compressors have an 1850 scfm capacity. | There is 1600 scfm margin in the ABSGTS. The Service Air compressors have an 1850 scfm capacity. | ||
Latest revision as of 20:51, 1 March 2018
| Where | |
|---|---|
Sequoyah  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+2.12 h0.0883 days <br />0.0126 weeks <br />0.0029 months <br />) | |
| Opened: | Robert Camenisch 22:07 Jan 3, 2014 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jan 30, 2014 |
| 49690 - NRC Website
| |