ENS 43198
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ENS Event | |
|---|---|
07:20 Feb 28, 2007 | |
| Title | Unit 2 Reactor Manually Scrammed Due to Decreasing Condenser Vacuum |
| Event Description | At 0120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br /> on February 28, 2007 the Unit 2 Reactor was manually scrammed due to decreasing condenser vacuum. All control rods fully inserted during the scram. Reactor water level decreased to approximately -10", which resulted in automatic Group II and III isolations as expected. All systems responded properly to the event. Unit 2 remains in Mode 3, maintaining reactor pressure, with reactor water level in the normal level band. The cause of this event is still under investigation.
Unit 1 was unaffected by the event and remains at 97% power. This report is being made in accordance with 10CFR50.72 (b)(2)(iv)(B) and 10CFR50.72 (b)(3)(iv)(A). The Main Condenser remains in service removing decay heat via the bypass valves. All ECCS equipment is available, if needed. The licensee will inform the State and has informed the NRC Resident Inspector. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.45 h-0.0604 days <br />-0.00863 weeks <br />-0.00199 months <br />) | |
| Opened: | Dave Bowman 05:53 Feb 28, 2007 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Feb 28, 2007 |
| 43198 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (30 %) |
| After | Hot Shutdown (0 %) |
Quad Cities with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 571412024-05-23T16:46:00023 May 2024 16:46:00
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