ENS 41934
ENS Event | |
|---|---|
04:00 Aug 19, 2005 | |
| Title | Violation of Maximum Core Power Level Per Operating License Requirements |
| Event Description | Pursuant to the reporting requirements of Item 2.H of the [Vogtle Electric Generating Plant] VEGP Unit 1 and Unit 2 operating licenses, [Southern Nuclear Company] SNC is notifying the NRC of overpower events in violation of the maximum core power level of 3565 MWt authorized by Item 2.C.(1) of the licenses.
Based on a review of operating data dating back to January 2, 2002, SNC has identified occurrences where the daily average core power exceeded 3565 MWt by as much as 0.4 MWt for Unit 1 and 0.9 MWt for Unit 2. The temperature signal from the steam generator blowdown, used as input into the computer calorimetric, was determined to be out of calibration in each unit. The licensee is evaluating this situation for a causal effect. The licensee notified the NRC Resident Inspector.
The licensee is retracting this report based on the following: On 8/19/05, VEGP notified the NRC Operations Center (Notification # 41934) of overpower events in violation of the maximum core power level of 3565 MWt authorized by Item 2.C.(1) of the Unit 1 and Unit 2. operating licenses. The non-conservative measurement of a plant parameter used in the calorimetric heat balance resulted in underestimating the calculated reactor thermal power. Correcting the calculated reactor thermal power for non-conservatism resulted in the conclusion that the licensed power level was exceeded. This led to the notification described above. Further engineering evaluation identified conservatisms in the heat balance calculation that were demonstrated to more than offset the non-conservatism discussed above. It was therefore concluded that the maximum core power level did not exceed the power level authorized by Item 2.C.(1) of Unit 1 and Unit 2 operating licenses. The licensee notified the NRC Resident Inspector. Notified R2DO (Mark Lesser). |
| Where | |
|---|---|
Vogtle  Georgia (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+16.53 h0.689 days <br />0.0984 weeks <br />0.0226 months <br />) | |
| Opened: | David Vineyard 20:32 Aug 19, 2005 |
| NRC Officer: | John Knoke |
| Last Updated: | Sep 2, 2005 |
| 41934 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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 | |