ENS 43830
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ENS Event | |
|---|---|
05:50 Dec 8, 2007 | |
| Title | Reactor Power Inadvertently Increased Above Accident Analysis Limit |
| Event Description | On December 8, 2007 at 0050, during plant maneuvers to return Unit Two from 84% to 100% reactor power following main turbine control valve testing, the two-minute instantaneous thermal power was inadvertently increased above the accident analysis thermal power limit of 2735.1 thermal megawatts while adjusting main turbine load to maintain Reactor Coolant temperature on program. The maximum power level attained was 2741 thermal megawatts. This is a potentially unanalyzed condition. Prompt operator action was taken to restore reactor power to within limits. Reactor thermal power was restored to within limits [below 2735.1 thermal megawatts] eight minutes later at 0058.
The two-minute instantaneous thermal power was restored to below 2700 thermal megawatts (100% rated thermal power) at 0105. The licensee notified the NRC Resident Inspector.
Based on the results of an evaluation of the event, the licensee concluded that Unit 2 operated at a maximum power level of 2741 MWth [101.5 percent rated thermal power (RTP)]. The maximum analyzed steady-state reactor core power levels, including uncertainties, are 102 percent of RTP or 2754 MWth. The unit was not in an unanalyzed condition. Therefore, this event is not reportable. Based on this evaluation, the associated non-emergency notification made on December 8, 2007, is retracted. Licensee has notified the NRC Resident Inspector. Notified R1DO (Perry). |
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+2.07 h0.0863 days <br />0.0123 weeks <br />0.00284 months <br />) | |
| Opened: | Kent Mills 07:54 Dec 8, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Dec 27, 2007 |
| 43830 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 536632018-10-11T04:00:00011 October 2018 04:00:00
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