ENS Event | |
|---|---|
13:30 Aug 26, 2020 | |
| Title | Design Change Altered Basis for Itaac |
| Event Description | In accordance with 10 CFR 52.99(c)(2), as described in NEI 08-01, 'Industry Guideline for the ITAAC Closure Process Under 10 CFR Part 52,' Vogtle Units 3 and 4 Construction is making this notification to the NRC for determining that Inspections, Tests, Analyses and Acceptance Criteria (ITAAC) 2.5.02.07a (Index No. 534) and ITAAC 2.5.02.07e (Index No. 538) for both units require additional actions to restore their completed status. The ITAAC Closure Notifications for ITAAC 534 were submitted on March 31, 2017 (Unit 3 ML17093A286, Unit 4 ML17093A535). The ITAAC Closure Notifications for ITAAC 538 were submitted on November 30, 2016 (Unit 3 ML16351A350, Unit 4 ML16351A334).
On August 26, 2020, it was determined that a design change, issued for several Protection and Safety Monitoring System (PMS) isolation barrier assemblies (ISBs), materially altered the basis for determining that the ITAAC 534 and ITAAC 538 Acceptance Criteria were met. The modified ISBs will require testing per IEEE 384-1981, Standard Criteria for Independence of Class 1E Equipment and Circuits, to demonstrate that the Acceptance Criteria is met. System function is not required while the plant is under construction. ITAAC Post Closure Notifications in accordance with 10 CFR 52.99(c)(2) will be submitted following completion of corrective actions. The 10 CFR 52.99(c)(4) All ITAAC Complete Notification has not been submitted for VEGP [(Vogtle Electric Generating Plant)] 3 and 4. The resident inspector has been notified. |
| Where | |
|---|---|
Vogtle  Georgia (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+51.13 h2.13 days <br />0.304 weeks <br />0.07 months <br />) | |
| Opened: | Nick Kellenberger 16:38 Aug 28, 2020 |
| NRC Officer: | Ossy Font |
| Last Updated: | Aug 28, 2020 |
| 54864 - NRC Website | |
Unit 3 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Under Construction (0 %) |
| After | Under Construction (0 %) |
Unit 4 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Under Construction (0 %) |
| After | Under Construction (0 %) |
WEEKMONTHYEARENS 549632020-10-19T08:00:00019 October 2020 08:00:00
[Table view]Other Unspec Reqmnt Update to Acceptance Criteria for Itaac ENS 548642020-08-26T04:00:00026 August 2020 04:00:00 Other Unspec Reqmnt Design Change Altered Basis for ITAAC ENS 524122016-11-30T21:00:00030 November 2016 21:00:00 Other Unspec Reqmnt Reactor Coolant Pump Breaker Cabinet Modification - Itaac Postclosure Notification ENS 419342005-08-19T04:00:00019 August 2005 04:00:00 Other Unspec Reqmnt Violation of Maximum Core Power Level Per Operating License Requirements ENS 414982005-03-16T10:40:00016 March 2005 10:40:00 Other Unspec Reqmnt Discovery of After-The Fact Emergency Condition Unusual Event 2020-08-26T04:00:00 | |