ENS 40130
ENS Event | |
|---|---|
12:30 Sep 3, 2003 | |
| Title | 24-Hour Report Required by License Condition -- Potential Violation of Maximum Power Level |
| Event Description | The following report was submitted by the licensee via fax:
This 24-hour report is being made as required by Braidwood Unit 1 License Condition 2.G and Braidwood Unit ~ License Condition 2.G as a potential violation of the maximum power level (3586.6 MWt) as stated in Unit 1 and Unit 2 License Condition 2.C(1). Braidwood received Nuclear Safety Advisory Letter (NSAL) 03-6 from Westinghouse Electric Company. This NSAL documented that errors were found in calculations that may result in the use of a non conservatively high net heat input value to the plant calorimetric calculation. The net heat input is the difference between the reactor core power and the nuclear steam supply system power. The values used in the NSAL were based on generic values for certain operational parameters. The NSAL documented that an increase in actual reactor power could be as much as 0.4 MWt. This equates to an error in reactor power of approximately 0.011%. Braidwood reviewed the power history and 8-hour average calorimetric values on Unit 1 and Unit 2 since full power uprate was applied on each Unit. Several time periods were identified on each Unit where the 8-hour calorimetric value exceeded the license thermal power limit when the 0.011% error was added to the 8-hour calorimetric value. Therefore, the licensed power limit of 3586.6 MWt was slightly exceeded on both Unit 1 and Unit 2. The power level on both Units was reduced to less than 100% to account for the 0.4 MWt error. The calorimetric program was then updated to account for this error. This issue was identified at 0730 on September 3, 2003, and has been entered into the Corrective Action Program. Additional information will be contained in the 30-day licensee event report. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+9.45 h0.394 days <br />0.0562 weeks <br />0.0129 months <br />) | |
| Opened: | Craig Ingold 21:57 Sep 3, 2003 |
| NRC Officer: | Nathan Sanfilippo |
| Last Updated: | Sep 3, 2003 |
| 40130 - 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 528022017-06-12T14:14:00012 June 2017 14:14:00
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