ENS 40123: Difference between revisions
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| event date = 08/31/2003 01:32 CDT | | event date = 08/31/2003 01:32 CDT | ||
| last update date = 09/02/2003 | | last update date = 09/02/2003 | ||
| title = 24-Hour Condition | | title = 24-Hour Condition of License Report Involving Potential Violation of Maximum Power Level | ||
| event text = This 24-hour report is being made as required by Braidwood Unit 2 License Condition 2.G as a potential violation of the maximum power level (3586.6 Mwt) as stated in Unit 2 License Condition 2.C(1). | | event text = This 24-hour report is being made as required by Braidwood Unit 2 License Condition 2.G as a potential violation of the maximum power level (3586.6 Mwt) as stated in Unit 2 License Condition 2.C(1). | ||
As a result of issues at Byron Unit 1 and Unit 2 concerning potential discrepancies in the ultrasonic flow measurements for the main feedwater system, Braidwood investigated both Unit 1 and Unit 2 to determine if similar issues existed. These flow measurements are used in the calorimetric calculation for reactor power. Ultrasonic flow measurements were taken on the four individual main feedwater lines on Braidwood Unit 2. These measurements identified the presence of flow signal noise in the data signals for two of the four ultrasonic flow measurement devices installed on the individual feedwater lines, which may adversely affect the integrity of these measurements. In response to identifying this flow signal noise, Braidwood removed corrections based on ultrasonic flow measurement from these two loops. Based on removing credit for these ultrasonic flow measurements, it was determined at 0132 on August 31, 2003, that Braidwood Unit 2 could have potentially exceeded its licensed thermal power limit by up to 0.8%. | As a result of issues at Byron Unit 1 and Unit 2 concerning potential discrepancies in the ultrasonic flow measurements for the main feedwater system, Braidwood investigated both Unit 1 and Unit 2 to determine if similar issues existed. These flow measurements are used in the calorimetric calculation for reactor power. Ultrasonic flow measurements were taken on the four individual main feedwater lines on Braidwood Unit 2. These measurements identified the presence of flow signal noise in the data signals for two of the four ultrasonic flow measurement devices installed on the individual feedwater lines, which may adversely affect the integrity of these measurements. In response to identifying this flow signal noise, Braidwood removed corrections based on ultrasonic flow measurement from these two loops. Based on removing credit for these ultrasonic flow measurements, it was determined at 0132 on August 31, 2003, that Braidwood Unit 2 could have potentially exceeded its licensed thermal power limit by up to 0.8%. | ||
Latest revision as of 21:25, 1 March 2018
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+13.18 h0.549 days <br />0.0785 weeks <br />0.0181 months <br />) | |
| Opened: | Frank Ehrhardt 19:43 Aug 31, 2003 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Sep 2, 2003 |
| 40123 - NRC Website
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