ENS 43346
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ENS Event | |
|---|---|
04:05 May 5, 2007 | |
| Title | Manual Reactor Scram on Loss of Feedwater |
| Event Description | The condensate prefilters isolated earlier in the day and the bypass valve automatically opened. The computer controlling these valves was in the process of being replaced when the bypass valve shut.
Unit experienced a loss of feedwater due to condensate pre-filter valves going closed. The reactor was manually scrammed and HPCI was used to restore reactor water level. MSIVs closed and the U2 and U2/3 EDGs auto started on low level. All rods fully inserted on the manual scram. Minimum level was approximately -54 inches. Decay heat is being removed using the isolation condenser and level is being maintained with Control Rod Drive leak by. No safety or relief valves lifted during this event. The plant is in the normal shutdown electrical lineup. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.87 h-0.0779 days <br />-0.0111 weeks <br />-0.00256 months <br />) | |
| Opened: | Chris Kent 02:13 May 5, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | May 5, 2007 |
| 43346 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
Dresden with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge | |
WEEKMONTHYEARENS 559882022-07-12T13:03:00012 July 2022 13:03:00
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