ENS 40559
ENS Event | |
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22:00 Mar 1, 2004 | |
Title | 24-Hour Condition of License Report Involving Potential Violation of Maximum Power Level |
Event Description | This 24-hour report is being made as required by Braidwood Unit 1 License Condition 2.G as a potential violation of the maximum power level 3586.6 MWt as stated in Unit 1 License Condition 2.C(1).
Braidwood is conservatively reporting an overpower condition on Unit 1 due to the implementation of an ultrasonic flow measurement system. Unit 1 was potentially overpowered a maximum of 1.07%. This value is based upon the maximum ultrasonic flow meter correction factor used for Unit 1 during the period between June 1999 and September 2003. During post installation testing of the permanent ultrasonic flow measurement system, discrepancies in the ultrasonic flow measurement system were identified that could have resulted in an overpower condition of Unit 2 during the previous use of the ultrasonic system (i.e., during the period between June 1999 and September 2003). The ultrasonic flow measurement system was used to correct venturi feedwater flow measurements. The corrected feedwater flow measurements were then used is the calorimetric calculation for reactor power. Currently Braidwood Unit 1 and Unit 2 are controlling power level based only on the venturi feedwater flow indication. The licensee notified the NRC Resident Inspector. |
Where | |
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Braidwood Illinois (NRC Region 3) | |
Reporting | |
Other Unspec Reqmnt | |
Time - Person (Reporting Time:+-2.92 h-0.122 days <br />-0.0174 weeks <br />-0.004 months <br />) | |
Opened: | Lawrence Brooks 19:05 Mar 1, 2004 |
NRC Officer: | Arlon Costa |
Last Updated: | Mar 1, 2004 |
40559 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 528022017-06-12T14:14:00012 June 2017 14:14:00
[Table view]Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for Discharge of Circulating Water ENS 476372012-02-03T06:00:0003 February 2012 06:00:00 Other Unspec Reqmnt ENS 467122011-03-30T20:38:00030 March 2011 20:38:00 Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition (Unusual Event) ENS 421872005-12-02T23:00:0002 December 2005 23:00:00 Other Unspec Reqmnt Reactor Power Operation in Excess of Operating License Condition ENS 405592004-03-01T22:00:0001 March 2004 22:00:00 Other Unspec Reqmnt 24-Hour Condition of License Report Involving Potential Violation of Maximum Power Level ENS 401302003-09-03T12:30:0003 September 2003 12:30:00 Other Unspec Reqmnt 24-Hour Report Required by License Condition -- Potential Violation of Maximum Power Level ENS 401232003-08-31T06:32:00031 August 2003 06:32:00 Other Unspec Reqmnt 24-Hour Condition of License Report Involving Potential Violation of Maximum Power Level 2017-06-12T14:14:00 | |