ENS Event | |
|---|---|
04:00 Feb 11, 2013 | |
| Title | Instrumentation Lines Not Inspected Completely for Proper Slope |
| Event Description | WBN [Watts Bar Nuclear] Unit 2 (under construction) determined that a portion of a number of instrumentation lines within multiple systems may have not been inspected completely for proper slope. This condition may have resulted in sense lines being installed with less than the 1/4" per foot minimum slope. No confirmed examples have been identified that would have created a substantial safety hazard at this time. However, walkdowns and evaluations are still underway to confirm that no substantial safety hazards exist. If any examples are found, they will be corrected prior to system turnover to Plant Operations. Therefore, at this time, the safety significance remains indeterminate. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 680826 and is being conservatively reported as a programmatic breakdown by WBN Unit 2 under 10 CFR 50.55(e).
The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.55(e) | |
| Time - Person (Reporting Time:+1182.87 h49.286 days <br />7.041 weeks <br />1.62 months <br />) | |
| Opened: | Gordon Arent 09:52 Apr 1, 2013 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Apr 1, 2013 |
| 48871 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Under Construction (0 %) |
| After | Under Construction (0 %) |
WEEKMONTHYEARENS 501662014-06-03T04:00:0003 June 2014 04:00:00
[Table view]10 CFR 50.55(e) Watts Bar Unit 2 Potentially Defective Fuses Installed ENS 492092013-07-22T13:55:00022 July 2013 13:55:00 10 CFR 50.55(e) Potential Programmatic Breakdown of the Quality Assurance Program ENS 488712013-02-11T04:00:00011 February 2013 04:00:00 10 CFR 50.55(e) Instrumentation Lines Not Inspected Completely for Proper Slope ENS 486462013-01-03T14:00:0003 January 2013 14:00:00 10 CFR 50.55(e) Commercial Grade Dedication Program Degraded 2014-06-03T04:00:00 | |